SQL语句的强化

数据库数据 

girls数据库

 1 /*
 2 SQLyog Ultimate v10.00 Beta1
 3 MySQL - 5.7.18-log : Database - girls
 4 *********************************************************************
 5 */
 6 
 7 
 8 /*!40101 SET NAMES utf8 */;
 9 
10 /*!40101 SET SQL_MODE=''*/;
11 
12 /*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
13 /*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
14 /*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
15 /*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
16 CREATE DATABASE /*!32312 IF NOT EXISTS*/`girls` /*!40100 DEFAULT CHARACTER SET utf8 */;
17 
18 USE `girls`;
19 
20 /*Table structure for table `admin` */
21 
22 DROP TABLE IF EXISTS `admin`;
23 
24 CREATE TABLE `admin` (
25   `id` int(11) NOT NULL AUTO_INCREMENT,
26   `username` varchar(10) NOT NULL,
27   `password` varchar(10) NOT NULL,
28   PRIMARY KEY (`id`)
29 ) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;
30 
31 /*Data for the table `admin` */
32 
33 insert  into `admin`(`id`,`username`,`password`) values (1,'john','8888'),(2,'lyt','6666');
34 
35 /*Table structure for table `beauty` */
36 
37 DROP TABLE IF EXISTS `beauty`;
38 
39 CREATE TABLE `beauty` (
40   `id` int(11) NOT NULL AUTO_INCREMENT,
41   `name` varchar(50) NOT NULL,
42   `sex` char(1) DEFAULT '',
43   `borndate` datetime DEFAULT '1987-01-01 00:00:00',
44   `phone` varchar(11) NOT NULL,
45   `photo` blob,
46   `boyfriend_id` int(11) DEFAULT NULL,
47   PRIMARY KEY (`id`)
48 ) ENGINE=InnoDB AUTO_INCREMENT=13 DEFAULT CHARSET=utf8;
49 
50 /*Data for the table `beauty` */
51 
52 insert  into `beauty`(`id`,`name`,`sex`,`borndate`,`phone`,`photo`,`boyfriend_id`) values (1,'柳岩','','1988-02-03 00:00:00','18209876577',NULL,8),(2,'苍老师','','1987-12-30 00:00:00','18219876577',NULL,9),(3,'Angelababy','','1989-02-03 00:00:00','18209876567',NULL,3),(4,'热巴','','1993-02-03 00:00:00','18209876579',NULL,2),(5,'周冬雨','','1992-02-03 00:00:00','18209179577',NULL,9),(6,'周芷若','','1988-02-03 00:00:00','18209876577',NULL,1),(7,'岳灵珊','','1987-12-30 00:00:00','18219876577',NULL,9),(8,'小昭','','1989-02-03 00:00:00','18209876567',NULL,1),(9,'双儿','','1993-02-03 00:00:00','18209876579',NULL,9),(10,'王语嫣','','1992-02-03 00:00:00','18209179577',NULL,4),(11,'夏雪','','1993-02-03 00:00:00','18209876579',NULL,9),(12,'赵敏','','1992-02-03 00:00:00','18209179577',NULL,1);
53 
54 /*Table structure for table `boys` */
55 
56 DROP TABLE IF EXISTS `boys`;
57 
58 CREATE TABLE `boys` (
59   `id` int(11) NOT NULL AUTO_INCREMENT,
60   `boyName` varchar(20) DEFAULT NULL,
61   `userCP` int(11) DEFAULT NULL,
62   PRIMARY KEY (`id`)
63 ) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8;
64 
65 /*Data for the table `boys` */
66 
67 insert  into `boys`(`id`,`boyName`,`userCP`) values (1,'张无忌',100),(2,'鹿晗',800),(3,'黄晓明',50),(4,'段誉',300);
68 
69 /*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
70 /*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
71 /*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
72 /*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

myemployees数据库

  1 /*
  2 SQLyog Ultimate v10.00 Beta1
  3 MySQL - 5.5.15 : Database - myemployees
  4 *********************************************************************
  5 */
  6 
  7 
  8 /*!40101 SET NAMES utf8 */;
  9 
 10 /*!40101 SET SQL_MODE=''*/;
 11 
 12 /*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
 13 /*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
 14 /*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
 15 /*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
 16 CREATE DATABASE /*!32312 IF NOT EXISTS*/`myemployees` /*!40100 DEFAULT CHARACTER SET gb2312 */;
 17 
 18 USE `myemployees`;
 19 
 20 /*Table structure for table `departments` */
 21 
 22 DROP TABLE IF EXISTS `departments`;
 23 
 24 CREATE TABLE `departments` (
 25   `department_id` int(4) NOT NULL AUTO_INCREMENT,
 26   `department_name` varchar(3) DEFAULT NULL,
 27   `manager_id` int(6) DEFAULT NULL,
 28   `location_id` int(4) DEFAULT NULL,
 29   PRIMARY KEY (`department_id`),
 30   KEY `loc_id_fk` (`location_id`),
 31   CONSTRAINT `loc_id_fk` FOREIGN KEY (`location_id`) REFERENCES `locations` (`location_id`)
 32 ) ENGINE=InnoDB AUTO_INCREMENT=271 DEFAULT CHARSET=gb2312;
 33 
 34 /*Data for the table `departments` */
 35 
 36 insert  into `departments`(`department_id`,`department_name`,`manager_id`,`location_id`) values (10,'Adm',200,1700),(20,'Mar',201,1800),(30,'Pur',114,1700),(40,'Hum',203,2400),(50,'Shi',121,1500),(60,'IT',103,1400),(70,'Pub',204,2700),(80,'Sal',145,2500),(90,'Exe',100,1700),(100,'Fin',108,1700),(110,'Acc',205,1700),(120,'Tre',NULL,1700),(130,'Cor',NULL,1700),(140,'Con',NULL,1700),(150,'Sha',NULL,1700),(160,'Ben',NULL,1700),(170,'Man',NULL,1700),(180,'Con',NULL,1700),(190,'Con',NULL,1700),(200,'Ope',NULL,1700),(210,'IT ',NULL,1700),(220,'NOC',NULL,1700),(230,'IT ',NULL,1700),(240,'Gov',NULL,1700),(250,'Ret',NULL,1700),(260,'Rec',NULL,1700),(270,'Pay',NULL,1700);
 37 
 38 /*Table structure for table `employees` */
 39 
 40 DROP TABLE IF EXISTS `employees`;
 41 
 42 CREATE TABLE `employees` (
 43   `employee_id` int(6) NOT NULL AUTO_INCREMENT,
 44   `first_name` varchar(20) DEFAULT NULL,
 45   `last_name` varchar(25) DEFAULT NULL,
 46   `email` varchar(25) DEFAULT NULL,
 47   `phone_number` varchar(20) DEFAULT NULL,
 48   `job_id` varchar(10) DEFAULT NULL,
 49   `salary` double(10,2) DEFAULT NULL,
 50   `commission_pct` double(4,2) DEFAULT NULL,
 51   `manager_id` int(6) DEFAULT NULL,
 52   `department_id` int(4) DEFAULT NULL,
 53   `hiredate` datetime DEFAULT NULL,
 54   PRIMARY KEY (`employee_id`),
 55   KEY `dept_id_fk` (`department_id`),
 56   KEY `job_id_fk` (`job_id`),
 57   CONSTRAINT `dept_id_fk` FOREIGN KEY (`department_id`) REFERENCES `departments` (`department_id`),
 58   CONSTRAINT `job_id_fk` FOREIGN KEY (`job_id`) REFERENCES `jobs` (`job_id`)
 59 ) ENGINE=InnoDB AUTO_INCREMENT=207 DEFAULT CHARSET=gb2312;
 60 
 61 /*Data for the table `employees` */
 62 
 63 insert  into `employees`(`employee_id`,`first_name`,`last_name`,`email`,`phone_number`,`job_id`,`salary`,`commission_pct`,`manager_id`,`department_id`,`hiredate`) values (100,'Steven','K_ing','SKING','515.123.4567','AD_PRES',24000.00,NULL,NULL,90,'1992-04-03 00:00:00'),(101,'Neena','Kochhar','NKOCHHAR','515.123.4568','AD_VP',17000.00,NULL,100,90,'1992-04-03 00:00:00'),(102,'Lex','De Haan','LDEHAAN','515.123.4569','AD_VP',17000.00,NULL,100,90,'1992-04-03 00:00:00'),(103,'Alexander','Hunold','AHUNOLD','590.423.4567','IT_PROG',9000.00,NULL,102,60,'1992-04-03 00:00:00'),(104,'Bruce','Ernst','BERNST','590.423.4568','IT_PROG',6000.00,NULL,103,60,'1992-04-03 00:00:00'),(105,'David','Austin','DAUSTIN','590.423.4569','IT_PROG',4800.00,NULL,103,60,'1998-03-03 00:00:00'),(106,'Valli','Pataballa','VPATABAL','590.423.4560','IT_PROG',4800.00,NULL,103,60,'1998-03-03 00:00:00'),(107,'Diana','Lorentz','DLORENTZ','590.423.5567','IT_PROG',4200.00,NULL,103,60,'1998-03-03 00:00:00'),(108,'Nancy','Greenberg','NGREENBE','515.124.4569','FI_MGR',12000.00,NULL,101,100,'1998-03-03 00:00:00'),(109,'Daniel','Faviet','DFAVIET','515.124.4169','FI_ACCOUNT',9000.00,NULL,108,100,'1998-03-03 00:00:00'),(110,'John','Chen','JCHEN','515.124.4269','FI_ACCOUNT',8200.00,NULL,108,100,'2000-09-09 00:00:00'),(111,'Ismael','Sciarra','ISCIARRA','515.124.4369','FI_ACCOUNT',7700.00,NULL,108,100,'2000-09-09 00:00:00'),(112,'Jose Manuel','Urman','JMURMAN','515.124.4469','FI_ACCOUNT',7800.00,NULL,108,100,'2000-09-09 00:00:00'),(113,'Luis','Popp','LPOPP','515.124.4567','FI_ACCOUNT',6900.00,NULL,108,100,'2000-09-09 00:00:00'),(114,'Den','Raphaely','DRAPHEAL','515.127.4561','PU_MAN',11000.00,NULL,100,30,'2000-09-09 00:00:00'),(115,'Alexander','Khoo','AKHOO','515.127.4562','PU_CLERK',3100.00,NULL,114,30,'2000-09-09 00:00:00'),(116,'Shelli','Baida','SBAIDA','515.127.4563','PU_CLERK',2900.00,NULL,114,30,'2000-09-09 00:00:00'),(117,'Sigal','Tobias','STOBIAS','515.127.4564','PU_CLERK',2800.00,NULL,114,30,'2000-09-09 00:00:00'),(118,'Guy','Himuro','GHIMURO','515.127.4565','PU_CLERK',2600.00,NULL,114,30,'2000-09-09 00:00:00'),(119,'Karen','Colmenares','KCOLMENA','515.127.4566','PU_CLERK',2500.00,NULL,114,30,'2000-09-09 00:00:00'),(120,'Matthew','Weiss','MWEISS','650.123.1234','ST_MAN',8000.00,NULL,100,50,'2004-02-06 00:00:00'),(121,'Adam','Fripp','AFRIPP','650.123.2234','ST_MAN',8200.00,NULL,100,50,'2004-02-06 00:00:00'),(122,'Payam','Kaufling','PKAUFLIN','650.123.3234','ST_MAN',7900.00,NULL,100,50,'2004-02-06 00:00:00'),(123,'Shanta','Vollman','SVOLLMAN','650.123.4234','ST_MAN',6500.00,NULL,100,50,'2004-02-06 00:00:00'),(124,'Kevin','Mourgos','KMOURGOS','650.123.5234','ST_MAN',5800.00,NULL,100,50,'2004-02-06 00:00:00'),(125,'Julia','Nayer','JNAYER','650.124.1214','ST_CLERK',3200.00,NULL,120,50,'2004-02-06 00:00:00'),(126,'Irene','Mikkilineni','IMIKKILI','650.124.1224','ST_CLERK',2700.00,NULL,120,50,'2004-02-06 00:00:00'),(127,'James','Landry','JLANDRY','650.124.1334','ST_CLERK',2400.00,NULL,120,50,'2004-02-06 00:00:00'),(128,'Steven','Markle','SMARKLE','650.124.1434','ST_CLERK',2200.00,NULL,120,50,'2004-02-06 00:00:00'),(129,'Laura','Bissot','LBISSOT','650.124.5234','ST_CLERK',3300.00,NULL,121,50,'2004-02-06 00:00:00'),(130,'Mozhe','Atkinson','MATKINSO','650.124.6234','ST_CLERK',2800.00,NULL,121,50,'2004-02-06 00:00:00'),(131,'James','Marlow','JAMRLOW','650.124.7234','ST_CLERK',2500.00,NULL,121,50,'2004-02-06 00:00:00'),(132,'TJ','Olson','TJOLSON','650.124.8234','ST_CLERK',2100.00,NULL,121,50,'2004-02-06 00:00:00'),(133,'Jason','Mallin','JMALLIN','650.127.1934','ST_CLERK',3300.00,NULL,122,50,'2004-02-06 00:00:00'),(134,'Michael','Rogers','MROGERS','650.127.1834','ST_CLERK',2900.00,NULL,122,50,'2002-12-23 00:00:00'),(135,'Ki','Gee','KGEE','650.127.1734','ST_CLERK',2400.00,NULL,122,50,'2002-12-23 00:00:00'),(136,'Hazel','Philtanker','HPHILTAN','650.127.1634','ST_CLERK',2200.00,NULL,122,50,'2002-12-23 00:00:00'),(137,'Renske','Ladwig','RLADWIG','650.121.1234','ST_CLERK',3600.00,NULL,123,50,'2002-12-23 00:00:00'),(138,'Stephen','Stiles','SSTILES','650.121.2034','ST_CLERK',3200.00,NULL,123,50,'2002-12-23 00:00:00'),(139,'John','Seo','JSEO','650.121.2019','ST_CLERK',2700.00,NULL,123,50,'2002-12-23 00:00:00'),(140,'Joshua','Patel','JPATEL','650.121.1834','ST_CLERK',2500.00,NULL,123,50,'2002-12-23 00:00:00'),(141,'Trenna','Rajs','TRAJS','650.121.8009','ST_CLERK',3500.00,NULL,124,50,'2002-12-23 00:00:00'),(142,'Curtis','Davies','CDAVIES','650.121.2994','ST_CLERK',3100.00,NULL,124,50,'2002-12-23 00:00:00'),(143,'Randall','Matos','RMATOS','650.121.2874','ST_CLERK',2600.00,NULL,124,50,'2002-12-23 00:00:00'),(144,'Peter','Vargas','PVARGAS','650.121.2004','ST_CLERK',2500.00,NULL,124,50,'2002-12-23 00:00:00'),(145,'John','Russell','JRUSSEL','011.44.1344.429268','SA_MAN',14000.00,0.40,100,80,'2002-12-23 00:00:00'),(146,'Karen','Partners','KPARTNER','011.44.1344.467268','SA_MAN',13500.00,0.30,100,80,'2002-12-23 00:00:00'),(147,'Alberto','Errazuriz','AERRAZUR','011.44.1344.429278','SA_MAN',12000.00,0.30,100,80,'2002-12-23 00:00:00'),(148,'Gerald','Cambrault','GCAMBRAU','011.44.1344.619268','SA_MAN',11000.00,0.30,100,80,'2002-12-23 00:00:00'),(149,'Eleni','Zlotkey','EZLOTKEY','011.44.1344.429018','SA_MAN',10500.00,0.20,100,80,'2002-12-23 00:00:00'),(150,'Peter','Tucker','PTUCKER','011.44.1344.129268','SA_REP',10000.00,0.30,145,80,'2014-03-05 00:00:00'),(151,'David','Bernstein','DBERNSTE','011.44.1344.345268','SA_REP',9500.00,0.25,145,80,'2014-03-05 00:00:00'),(152,'Peter','Hall','PHALL','011.44.1344.478968','SA_REP',9000.00,0.25,145,80,'2014-03-05 00:00:00'),(153,'Christopher','Olsen','COLSEN','011.44.1344.498718','SA_REP',8000.00,0.20,145,80,'2014-03-05 00:00:00'),(154,'Nanette','Cambrault','NCAMBRAU','011.44.1344.987668','SA_REP',7500.00,0.20,145,80,'2014-03-05 00:00:00'),(155,'Oliver','Tuvault','OTUVAULT','011.44.1344.486508','SA_REP',7000.00,0.15,145,80,'2014-03-05 00:00:00'),(156,'Janette','K_ing','JKING','011.44.1345.429268','SA_REP',10000.00,0.35,146,80,'2014-03-05 00:00:00'),(157,'Patrick','Sully','PSULLY','011.44.1345.929268','SA_REP',9500.00,0.35,146,80,'2014-03-05 00:00:00'),(158,'Allan','McEwen','AMCEWEN','011.44.1345.829268','SA_REP',9000.00,0.35,146,80,'2014-03-05 00:00:00'),(159,'Lindsey','Smith','LSMITH','011.44.1345.729268','SA_REP',8000.00,0.30,146,80,'2014-03-05 00:00:00'),(160,'Louise','Doran','LDORAN','011.44.1345.629268','SA_REP',7500.00,0.30,146,80,'2014-03-05 00:00:00'),(161,'Sarath','Sewall','SSEWALL','011.44.1345.529268','SA_REP',7000.00,0.25,146,80,'2014-03-05 00:00:00'),(162,'Clara','Vishney','CVISHNEY','011.44.1346.129268','SA_REP',10500.00,0.25,147,80,'2014-03-05 00:00:00'),(163,'Danielle','Greene','DGREENE','011.44.1346.229268','SA_REP',9500.00,0.15,147,80,'2014-03-05 00:00:00'),(164,'Mattea','Marvins','MMARVINS','011.44.1346.329268','SA_REP',7200.00,0.10,147,80,'2014-03-05 00:00:00'),(165,'David','Lee','DLEE','011.44.1346.529268','SA_REP',6800.00,0.10,147,80,'2014-03-05 00:00:00'),(166,'Sundar','Ande','SANDE','011.44.1346.629268','SA_REP',6400.00,0.10,147,80,'2014-03-05 00:00:00'),(167,'Amit','Banda','ABANDA','011.44.1346.729268','SA_REP',6200.00,0.10,147,80,'2014-03-05 00:00:00'),(168,'Lisa','Ozer','LOZER','011.44.1343.929268','SA_REP',11500.00,0.25,148,80,'2014-03-05 00:00:00'),(169,'Harrison','Bloom','HBLOOM','011.44.1343.829268','SA_REP',10000.00,0.20,148,80,'2014-03-05 00:00:00'),(170,'Tayler','Fox','TFOX','011.44.1343.729268','SA_REP',9600.00,0.20,148,80,'2014-03-05 00:00:00'),(171,'William','Smith','WSMITH','011.44.1343.629268','SA_REP',7400.00,0.15,148,80,'2014-03-05 00:00:00'),(172,'Elizabeth','Bates','EBATES','011.44.1343.529268','SA_REP',7300.00,0.15,148,80,'2014-03-05 00:00:00'),(173,'Sundita','Kumar','SKUMAR','011.44.1343.329268','SA_REP',6100.00,0.10,148,80,'2014-03-05 00:00:00'),(174,'Ellen','Abel','EABEL','011.44.1644.429267','SA_REP',11000.00,0.30,149,80,'2014-03-05 00:00:00'),(175,'Alyssa','Hutton','AHUTTON','011.44.1644.429266','SA_REP',8800.00,0.25,149,80,'2014-03-05 00:00:00'),(176,'Jonathon','Taylor','JTAYLOR','011.44.1644.429265','SA_REP',8600.00,0.20,149,80,'2014-03-05 00:00:00'),(177,'Jack','Livingston','JLIVINGS','011.44.1644.429264','SA_REP',8400.00,0.20,149,80,'2014-03-05 00:00:00'),(178,'Kimberely','Grant','KGRANT','011.44.1644.429263','SA_REP',7000.00,0.15,149,NULL,'2014-03-05 00:00:00'),(179,'Charles','Johnson','CJOHNSON','011.44.1644.429262','SA_REP',6200.00,0.10,149,80,'2014-03-05 00:00:00'),(180,'Winston','Taylor','WTAYLOR','650.507.9876','SH_CLERK',3200.00,NULL,120,50,'2014-03-05 00:00:00'),(181,'Jean','Fleaur','JFLEAUR','650.507.9877','SH_CLERK',3100.00,NULL,120,50,'2014-03-05 00:00:00'),(182,'Martha','Sullivan','MSULLIVA','650.507.9878','SH_CLERK',2500.00,NULL,120,50,'2014-03-05 00:00:00'),(183,'Girard','Geoni','GGEONI','650.507.9879','SH_CLERK',2800.00,NULL,120,50,'2014-03-05 00:00:00'),(184,'Nandita','Sarchand','NSARCHAN','650.509.1876','SH_CLERK',4200.00,NULL,121,50,'2014-03-05 00:00:00'),(185,'Alexis','Bull','ABULL','650.509.2876','SH_CLERK',4100.00,NULL,121,50,'2014-03-05 00:00:00'),(186,'Julia','Dellinger','JDELLING','650.509.3876','SH_CLERK',3400.00,NULL,121,50,'2014-03-05 00:00:00'),(187,'Anthony','Cabrio','ACABRIO','650.509.4876','SH_CLERK',3000.00,NULL,121,50,'2014-03-05 00:00:00'),(188,'Kelly','Chung','KCHUNG','650.505.1876','SH_CLERK',3800.00,NULL,122,50,'2014-03-05 00:00:00'),(189,'Jennifer','Dilly','JDILLY','650.505.2876','SH_CLERK',3600.00,NULL,122,50,'2014-03-05 00:00:00'),(190,'Timothy','Gates','TGATES','650.505.3876','SH_CLERK',2900.00,NULL,122,50,'2014-03-05 00:00:00'),(191,'Randall','Perkins','RPERKINS','650.505.4876','SH_CLERK',2500.00,NULL,122,50,'2014-03-05 00:00:00'),(192,'Sarah','Bell','SBELL','650.501.1876','SH_CLERK',4000.00,NULL,123,50,'2014-03-05 00:00:00'),(193,'Britney','Everett','BEVERETT','650.501.2876','SH_CLERK',3900.00,NULL,123,50,'2014-03-05 00:00:00'),(194,'Samuel','McCain','SMCCAIN','650.501.3876','SH_CLERK',3200.00,NULL,123,50,'2014-03-05 00:00:00'),(195,'Vance','Jones','VJONES','650.501.4876','SH_CLERK',2800.00,NULL,123,50,'2014-03-05 00:00:00'),(196,'Alana','Walsh','AWALSH','650.507.9811','SH_CLERK',3100.00,NULL,124,50,'2014-03-05 00:00:00'),(197,'Kevin','Feeney','KFEENEY','650.507.9822','SH_CLERK',3000.00,NULL,124,50,'2014-03-05 00:00:00'),(198,'Donald','OConnell','DOCONNEL','650.507.9833','SH_CLERK',2600.00,NULL,124,50,'2014-03-05 00:00:00'),(199,'Douglas','Grant','DGRANT','650.507.9844','SH_CLERK',2600.00,NULL,124,50,'2014-03-05 00:00:00'),(200,'Jennifer','Whalen','JWHALEN','515.123.4444','AD_ASST',4400.00,NULL,101,10,'2016-03-03 00:00:00'),(201,'Michael','Hartstein','MHARTSTE','515.123.5555','MK_MAN',13000.00,NULL,100,20,'2016-03-03 00:00:00'),(202,'Pat','Fay','PFAY','603.123.6666','MK_REP',6000.00,NULL,201,20,'2016-03-03 00:00:00'),(203,'Susan','Mavris','SMAVRIS','515.123.7777','HR_REP',6500.00,NULL,101,40,'2016-03-03 00:00:00'),(204,'Hermann','Baer','HBAER','515.123.8888','PR_REP',10000.00,NULL,101,70,'2016-03-03 00:00:00'),(205,'Shelley','Higgins','SHIGGINS','515.123.8080','AC_MGR',12000.00,NULL,101,110,'2016-03-03 00:00:00'),(206,'William','Gietz','WGIETZ','515.123.8181','AC_ACCOUNT',8300.00,NULL,205,110,'2016-03-03 00:00:00');
 64 
 65 /*Table structure for table `jobs` */
 66 
 67 DROP TABLE IF EXISTS `jobs`;
 68 
 69 CREATE TABLE `jobs` (
 70   `job_id` varchar(10) NOT NULL,
 71   `job_title` varchar(35) DEFAULT NULL,
 72   `min_salary` int(6) DEFAULT NULL,
 73   `max_salary` int(6) DEFAULT NULL,
 74   PRIMARY KEY (`job_id`)
 75 ) ENGINE=InnoDB DEFAULT CHARSET=gb2312;
 76 
 77 /*Data for the table `jobs` */
 78 
 79 insert  into `jobs`(`job_id`,`job_title`,`min_salary`,`max_salary`) values ('AC_ACCOUNT','Public Accountant',4200,9000),('AC_MGR','Accounting Manager',8200,16000),('AD_ASST','Administration Assistant',3000,6000),('AD_PRES','President',20000,40000),('AD_VP','Administration Vice President',15000,30000),('FI_ACCOUNT','Accountant',4200,9000),('FI_MGR','Finance Manager',8200,16000),('HR_REP','Human Resources Representative',4000,9000),('IT_PROG','Programmer',4000,10000),('MK_MAN','Marketing Manager',9000,15000),('MK_REP','Marketing Representative',4000,9000),('PR_REP','Public Relations Representative',4500,10500),('PU_CLERK','Purchasing Clerk',2500,5500),('PU_MAN','Purchasing Manager',8000,15000),('SA_MAN','Sales Manager',10000,20000),('SA_REP','Sales Representative',6000,12000),('SH_CLERK','Shipping Clerk',2500,5500),('ST_CLERK','Stock Clerk',2000,5000),('ST_MAN','Stock Manager',5500,8500);
 80 
 81 /*Table structure for table `locations` */
 82 
 83 DROP TABLE IF EXISTS `locations`;
 84 
 85 CREATE TABLE `locations` (
 86   `location_id` int(11) NOT NULL AUTO_INCREMENT,
 87   `street_address` varchar(40) DEFAULT NULL,
 88   `postal_code` varchar(12) DEFAULT NULL,
 89   `city` varchar(30) DEFAULT NULL,
 90   `state_province` varchar(25) DEFAULT NULL,
 91   `country_id` varchar(2) DEFAULT NULL,
 92   PRIMARY KEY (`location_id`)
 93 ) ENGINE=InnoDB AUTO_INCREMENT=3201 DEFAULT CHARSET=gb2312;
 94 
 95 /*Data for the table `locations` */
 96 
 97 insert  into `locations`(`location_id`,`street_address`,`postal_code`,`city`,`state_province`,`country_id`) values (1000,'1297 Via Cola di Rie','00989','Roma',NULL,'IT'),(1100,'93091 Calle della Testa','10934','Venice',NULL,'IT'),(1200,'2017 Shinjuku-ku','1689','Tokyo','Tokyo Prefecture','JP'),(1300,'9450 Kamiya-cho','6823','Hiroshima',NULL,'JP'),(1400,'2014 Jabberwocky Rd','26192','Southlake','Texas','US'),(1500,'2011 Interiors Blvd','99236','South San Francisco','California','US'),(1600,'2007 Zagora St','50090','South Brunswick','New Jersey','US'),(1700,'2004 Charade Rd','98199','Seattle','Washington','US'),(1800,'147 Spadina Ave','M5V 2L7','Toronto','Ontario','CA'),(1900,'6092 Boxwood St','YSW 9T2','Whitehorse','Yukon','CA'),(2000,'40-5-12 Laogianggen','190518','Beijing',NULL,'CN'),(2100,'1298 Vileparle (E)','490231','Bombay','Maharashtra','IN'),(2200,'12-98 Victoria Street','2901','Sydney','New South Wales','AU'),(2300,'198 Clementi North','540198','Singapore',NULL,'SG'),(2400,'8204 Arthur St',NULL,'London',NULL,'UK'),(2500,'Magdalen Centre, The Oxford Science Park','OX9 9ZB','Oxford','Oxford','UK'),(2600,'9702 Chester Road','09629850293','Stretford','Manchester','UK'),(2700,'Schwanthalerstr. 7031','80925','Munich','Bavaria','DE'),(2800,'Rua Frei Caneca 1360 ','01307-002','Sao Paulo','Sao Paulo','BR'),(2900,'20 Rue des Corps-Saints','1730','Geneva','Geneve','CH'),(3000,'Murtenstrasse 921','3095','Bern','BE','CH'),(3100,'Pieter Breughelstraat 837','3029SK','Utrecht','Utrecht','NL'),(3200,'Mariano Escobedo 9991','11932','Mexico City','Distrito Federal,','MX');
 98 
 99 /*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
100 /*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
101 /*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
102 /*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

 基础查询

 1 # 基础查询DQL data query language
 2 /*
 3 特点:
 4 1.查询列表可以是:表中的字段、常量值、表达式、函数
 5 2.查询的结果是一张虚拟表
 6 */
 7 
 8 USE myemployees;
 9 # 1.查询单个字段
10 SELECT last_name FROM employees;
11 # 2.查询表中多个字段
12 SELECT last_name, email FROM employees;
13 # 3.查询表中所有字段
14 SELECT * FROM employees;
15 # 4.查询表中所有字段方式2  着重号区分字段与关键字
16 SELECT
17     `first_name`,
18     `last_name`,
19     `email`,
20     `salary` 
21 FROM
22     employees;
23     
24 # 5.查询常量值
25 SELECT 100;
26 
27 # 6.查询表达式
28 SELECT 100*98
29 
30 # 7.查询函数
31 SELECT VERSION();
32 
33 
34 
35 # 8. 起别名
36 # 方式1
37 SELECT 100*98 AS 结果;
38 SELECT last_name AS 姓, first_name ASFROM employees;
39 
40 # 方式2
41 SELECT last_name 姓,first_name 名 FROM employees;
42 
43 # 方式3 区分与关键字发生冲突 加双引号
44 SELECT last_name "OUT put" FROM employees
45 
46 
47 # 9.去重
48 SELECT DISTINCT department_id FROM employees;
49 
50 # 10.连接符
51 SELECT CONCAT(first_name, " ", last_name) AS 姓名 FROM employees;
52 
53 
54 # 11.IFNULL(expr1,expr2)的使用
55 SELECT CONCAT(last_name, first_name, IFNULL(commission_pct, 0)) FROM employees;

条件查询

 1 # 一. 按照条件表达式查询
 2 
 3 # 1.查询出工资大于12000的员工信息
 4 
 5 SELECT
 6     * 
 7 FROM
 8     employees 
 9 WHERE
10     salary > 12000;
11     
12 # 2.查询出员工编号不等于90的员工名字与部门编号
13 SELECT last_name, department_id FROM employees WHERE department_id != 90;
14 
15 
16 # 二.按照逻辑表达式查询
17 # 1. 查询工资在10000-20000的员工名,工资,奖金
18 SELECT last_name, salary, commission_pct FROM employees WHERE salary>10000 AND salary<20000;
19 
20 
21 # 三、模糊查询

常见函数

 1 # 1.流程控制函数 IF(expr1,expr2,expr3)函数
 2 # 2.流程控制函数 case函数 后面跟字段或表达式   或者都不跟  单行函数
 3 SELECT
 4     salary 原工资,
 5     department_id,
 6 CASE
 7         department_id 
 8         WHEN 30 THEN
 9         salary * 1.1 
10         WHEN 40 THEN
11         salary * 1.2 
12         WHEN 50 THEN
13         salary * 1.3 ELSE salary 
14     END AS 新工资 
15 FROM
16     employees;
17     
18     
19 SELECT
20     salary,
21 CASE
22         
23         WHEN salary > 20000 THEN
24         'A' 
25         WHEN salary > 15000 THEN
26         'B' 
27         WHEN salary > 10000 THEN
28         'C' ELSE 'D' 
29     END AS 工资级别 
30 FROM
31     employees;

分组查询

 1 # GROUP BY
 2 -- 查询每个工种的最高工资
 3 -- 语法: 分组函数 列 表 分组 字段
 4 SELECT
 5     MAX( salary ),
 6     job_id 
 7 FROM
 8     employees 
 9 GROUP BY
10     job_id;
11     
12     
13 -- 查询每个位置上的部门个数
14 SELECT COUNT(*), location_id FROM departments GROUP BY location_id;
15 
16 
17 -- 查询邮箱中包含a字符的,每个部门的平均工资
18 SELECT
19     AVG( salary ),
20     department_id,
21     email 
22 FROM
23     employees 
24 WHERE
25     email LIKE '%a%' 
26 GROUP BY
27     department_id;
28     
29 -- 查询有奖金的每个领导员工的最高工资
30 SELECT MAX(salary), manager_id FROM employees WHERE commission_pct IS NOT NULL GROUP BY manager_id;
31 
32 --  查询哪个部门的员工个数大于2  添加分组后的刷选
33 # 1.首先查出每个部门员工的个数
34 SELECT COUNT(*),  department_id FROM employees GROUP BY department_id;
35 # 2.再在新临时表后加筛选
36 SELECT COUNT(*),  department_id FROM employees GROUP BY department_id HAVING COUNT(*) > 2;
37 
38 
39 -- 查询每个工种有奖金的员工的最高工资大于12000的工种编号和最高工资;
40 -- 1.查询每个工种有奖金的员工的最高工资 
41 SELECT MAX(salary), job_id FROM employees WHERE commission_pct IS NOT NULL GROUP BY job_id;
42 -- 2.在1之后的结果再加条件
43 SELECT
44     MAX( salary ) AS 最高工资,
45     job_id 
46 FROM
47     employees 
48 WHERE
49     commission_pct IS NOT NULL 
50 GROUP BY
51     job_id 
52 HAVING
53     最高工资 > 12000;
54     
55     
56 -- 查询领导编号大于102的每个领导手下的最低工资大于5000的领导编号是哪个 以及最低工资    
57 
58 SELECT
59     MIN( salary ),
60     manager_id 
61 FROM
62     employees 
63 WHERE
64     manager_id > 102 
65 GROUP BY
66     manager_id 
67 HAVING
68     MIN( salary )> 5000;

分组函数

 1 # 分组函数  统计作用
 2 -- SUM AVG处理数字型  
 3 -- MIN MAX COUNT可以处理任何类型 日期 字符都行
 4 
 5 SELECT SUM(salary) 和, ROUND(AVG(salary), 2) 平均, MIN(salary) 最小, MAX(salary) 最大, COUNT(salary) 个数 FROM employees;
 6 
 7 -- 和distinct搭配使用
 8 SELECT SUM(DISTINCT(salary)), SUM(salary) FROM employees;
 9 
10 -- count的详细使用
11 
12 SELECT COUNT(salary) FROM employees;
13 
14 -- 统计行数  效率稍微比上边高点
15 SELECT COUNT(1) FROM employees;
16 SELECT COUNT(*) FROM employees; # 这种情况用的比较多

连接查询

  1 # SQL92
  2 #   连接查询 多张表查询
  3 USE girls;
  4 -- 笛卡尔积乘积现象
  5 SELECT NAME, boyname FROM beauty, boys;  #没有条件去约束
  6 
  7 
  8 # 1.等值连接
  9 SELECT NAME
 10     ,
 11     boyname 
 12 FROM
 13     beauty,
 14     boys 
 15 WHERE
 16     beauty.boyfriend_id = boys.id;
 17 
 18 -- 查询员工对应的部门
 19 USE myemployees;
 20 SELECT
 21     last_name,
 22     department_name 
 23 FROM
 24     employees,
 25     departments 
 26 WHERE
 27     employees.department_id = departments.department_id;
 28     
 29     
 30 -- 查询员工名 工种号 工种名
 31 SELECT
 32     last_name,
 33     employees.job_id,
 34     job_title 
 35 FROM
 36     employees,
 37     jobs 
 38 WHERE
 39     employees.job_id = jobs.job_id;
 40     
 41 SELECT
 42     last_name,
 43     e.job_id,
 44     job_title 
 45 FROM
 46     employees e,
 47     jobs j 
 48 WHERE
 49     e.job_id = j.job_id;
 50     
 51 
 52 -- 可以加筛选 分组group by 分组后筛选having 排序order by
 53 -- 查询城市名第二个字符为o的部门名以及城市名
 54 SELECT
 55     department_name,
 56     city 
 57 FROM
 58     departments,
 59     locations 
 60 WHERE
 61     locations.location_id = departments.location_id 
 62     AND city LIKE '_o%';
 63     
 64     
 65 -- 非等值连接  与等值连接一样可以加分组 排序等条件
 66 CREATE TABLE job_grades(
 67 grade_level VARCHAR(3),
 68 lowest_sal INT,
 69 highest_sal INT
 70 );
 71 
 72 INSERT INTO job_grades(grade_level, lowest_sal, highest_sal) VALUES
 73 ("A", 1000, 2999),
 74 ("B", 3000, 5999),
 75 ("C", 6000, 9999),
 76 ("D", 10000, 14999),
 77 ("E", 15000, 24999),
 78 ("F", 25000, 40000);
 79 
 80 # 查询员工的工资以及对应的级别
 81 SELECT
 82     salary,
 83     grade_level 
 84 FROM
 85     employees e,
 86     job_grades g 
 87 WHERE
 88     salary BETWEEN g.lowest_sal 
 89     AND g.highest_sal;
 90     
 91 -- 自连接
 92 -- 查询员工名与上级名
 93 SELECT last_name, manager_id, employee_id FROM employees;
 94 SELECT
 95     e.employee_id,
 96     e.last_name,
 97     m.last_name, 
 98     m.employee_id 
 99 FROM
100     employees e,
101     employees m 
102 WHERE
103     e.manager_id = m.employee_id;
104       

SQL99语法连接

  1 # SQL99语法
  2 /*
  3 -- 格式:
  4 SELECT 查询列表
  5 FROM 表1 别名 连接类型
  6 JOIN 表2 别名
  7 ON                 连接条件
  8 WHERE         筛选条件
  9 GROUP BY  分组
 10 HAVING         筛选条件
 11 ORDER BY  排序列表
 12 
 13 
 14 分类
 15 内连接: INNER JOIN  等值 非等值 自连接
 16 外连接
 17         左外 LEFT OUTER
 18         右外 RIGHT OUTER
 19         全外 FULL OUTER
 20 交叉连接 cross
 21 
 22 内连接
 23 语法:
 24 SELECT 查询列表
 25 FROM 表1 别名
 26 INNER JOIN 表2 别名
 27 ON 连接条件
 28 */
 29 
 30 #1. 等值连接
 31 # 案例1: 查询员工名、部门名
 32 SELECT
 33     last_name,
 34     department_name 
 35 FROM
 36     employees e
 37     INNER JOIN departments d ON e.department_id = d.department_id;
 38     
 39 # 案例2 查询名字中包含e的员工名和工种名
 40 SELECT 
 41     last_name,
 42     job_title
 43 FROM 
 44     employees e
 45 INNER JOIN jobs j
 46 ON e.job_id = j.job_id
 47 WHERE e.last_name LIKE '%e%';
 48 
 49 # 案例3 查询部门个数大于3的城市名与部门个数
 50 # 案例4 查询哪个部门的员工个数>3的部门名和员工个数,并按照个数排序(降序)
 51 SELECT department_name, COUNT(*) 个数 FROM employees e INNER JOIN departments d ON e.department_id = d.department_id
 52 GROUP BY department_name
 53 HAVING COUNT(*) > 3 
 54 ORDER BY COUNT(*) DESC;
 55 
 56 # 案例5查询员工名 部门名 工种名 并按照部门名降序
 57 SELECT
 58     last_name,
 59     department_name,
 60     job_title 
 61 FROM
 62     employees e
 63     INNER JOIN departments d ON e.employee_id = d.department_id
 64     INNER JOIN jobs j ON e.job_id = j.job_id 
 65 ORDER BY
 66     department_name DESC;
 67     
 68     
 69 # 2.非等值连接
 70 # 查询员工的工资级别
 71 SELECT
 72     salary,
 73     grade_level 
 74 FROM
 75     employees e
 76     JOIN job_grades j ON e.salary BETWEEN j.lowest_sal 
 77     AND j.highest_sal;
 78     
 79 # 查询员工的工资级别个数大于20的个数并且已工资级别降序
 80 SELECT
 81     COUNT(*),
 82     grade_level 
 83 FROM
 84     employees e
 85     JOIN job_grades j ON e.salary BETWEEN j.lowest_sal 
 86     AND j.highest_sal 
 87 GROUP BY
 88     grade_level 
 89 HAVING
 90     COUNT(*) > 20 
 91 ORDER BY
 92     grade_level DESC;
 93     
 94 # 3 自连接
 95 # 查询姓名中包含字符K的员工的名字 上级的名字 其中inner可以省掉
 96 SELECT e.last_name, m.last_name
 97 FROM employees e
 98 INNER JOIN employees m
 99 ON e.manager_id = m.employee_id
100 WHERE e.last_name LIKE '%k%';
101 
102 
103 -- 二 外连接
104 # 外连接应用场景就是一张表关联另外一张表里边没有的数据
105 # 左外连接 left JOIN左边的是主表
106 # 右外连接 right JOIN 右边的是主表
107 # 左外 与 右外 交换两张表的顺序 最终的结果是一样的
108 # 查询男朋友不在男神表中的女神名字
109 USE girls;
110 # 左外连接
111 SELECT
112     b.NAME,
113     bo.* 
114 FROM
115     beauty b
116     LEFT OUTER JOIN boys bo ON b.boyfriend_id = bo.id 
117 WHERE
118     bo.id IS NULL;
119 # 右外连接
120 SELECT
121     b.NAME,
122     bo.* 
123 FROM
124     boys bo
125     RIGHT OUTER JOIN beauty b ON b.boyfriend_id = bo.id 
126 WHERE
127     bo.id IS NULL;
128     
129 # 全外连接
130 # 全外连接的结果就是相当于内连接的结果+表1中有的但表2中没有+表2中有的但表1中没有
131 -- FULL OUTER JOIN  在mysql中是不支持全外连接的
132 SELECT
133     b.NAME,
134     bo.* 
135 FROM
136     boys bo
137     FULL OUTER JOIN beauty b ON b.boyfriend_id = bo.id 
138 WHERE
139     bo.id IS NULL;
140 
141 # 交叉连接
142 -- CROSS JOIN
143 SELECT b.*,bo.* FROM beauty b CROSS JOIN boys bo;
144 
145    
原文地址:https://www.cnblogs.com/Alexephor/p/12852662.html