SqlServer字段说明查询及快速查看表结构

 

1.查询数据库中的所有数据库名：

SELECT Name FROM Master..SysDatabases ORDER BY Name

2.查询某个数据库中所有的表名：

SELECT Name FROM SysObjects Where XType='U' ORDER BY Name

3.SqlServer字段说明查询

SELECT t.[name] AS 表名,c.[name] AS 字段名,cast(ep.[value] 
  as varchar(100)) AS [字段说明]
  FROM sys.tables AS t
  INNER JOIN sys.columns 
  AS c ON t.object_id = c.object_id
   LEFT JOIN sys.extended_properties AS ep 
  ON ep.major_id = c.object_id AND ep.minor_id = c.column_id WHERE ep.class =1 
  AND t.name='TableName'

4.查看表名注释

SELECT DISTINCT
    d.name,
    f.value 
FROM
    syscolumns a
    LEFT JOIN systypes b ON a.xusertype= b.xusertype
    INNER JOIN sysobjects d ON a.id= d.id 
    AND d.xtype= 'U' 
    AND d.name<> 'dtproperties'
    LEFT JOIN syscomments e ON a.cdefault= e.id
    LEFT JOIN sys.extended_properties g ON a.id= G.major_id 
    AND a.colid= g.minor_id
    LEFT JOIN sys.extended_properties f ON d.id= f.major_id 
    AND f.minor_id= 0
WHERE d.name='table_name'

5.快速查看表结构

--快速查看表结构（比较全面的）
SELECT  obj.name AS 表名,
        col.colorder AS 序号 ,
        col.name AS 列名 ,
        ISNULL(ep.[value], '') AS 列说明 ,
        t.name AS 数据类型 ,
        col.length AS 长度 ,
        ISNULL(COLUMNPROPERTY(col.id, col.name, 'Scale'), 0) AS 小数位数 ,
        CASE WHEN COLUMNPROPERTY(col.id, col.name, 'IsIdentity') = 1 THEN '√'
             ELSE ''
        END AS 标识 ,
        CASE WHEN EXISTS ( SELECT   1
                           FROM     dbo.sysindexes si
                                    INNER JOIN dbo.sysindexkeys sik ON si.id = sik.id
                                                              AND si.indid = sik.indid
                                    INNER JOIN dbo.syscolumns sc ON sc.id = sik.id
                                                              AND sc.colid = sik.colid
                                    INNER JOIN dbo.sysobjects so ON so.name = si.name
                                                              AND so.xtype = 'PK'
                           WHERE    sc.id = col.id
                                    AND sc.colid = col.colid ) THEN '√'
             ELSE ''
        END AS 主键 ,
        CASE WHEN col.isnullable = 1 THEN '√'
             ELSE ''
        END AS 允许空 ,
        ISNULL(comm.text, '') AS 默认值
FROM    dbo.syscolumns col
        LEFT  JOIN dbo.systypes t ON col.xtype = t.xusertype
        inner JOIN dbo.sysobjects obj ON col.id = obj.id
                                         AND obj.xtype = 'U'
                                         AND obj.status >= 0
        LEFT  JOIN dbo.syscomments comm ON col.cdefault = comm.id
        LEFT  JOIN sys.extended_properties ep ON col.id = ep.major_id
                                                      AND col.colid = ep.minor_id
                                                      AND ep.name = 'MS_Description'
        LEFT  JOIN sys.extended_properties epTwo ON obj.id = epTwo.major_id
                                                         AND epTwo.minor_id = 0
                                                         AND epTwo.name = 'MS_Description'
WHERE   obj.name = 'TableName'--表名
ORDER BY obj.name,col.colorder ;