Sql_Case_When用法

http://wenku.baidu.com/link?url=XBnkUzGtiJFhTnQk5HbmdgndhVEYJdcfDEhSEIFeTRn9-41KMLf_49wKiydNCF-4g3QiMc5n5tmn0mvgIZBxVc3BXdjk61OKKO3iIX0_FNS

原文地址:https://www.cnblogs.com/lilefordream/p/4036711.html