预防字段空值的处理 SELECT DEPTNO ,DEPTNAME ,COALESCE(MGRNO ,''ABSENT''),ADMRDEPT FROM DEPARTMENT

日期、时间及时间戳记，请参考适当的 DB2 寄存器：SELECT current date FROM sysibm.sysdummy1SELECT current time FROM sysibm

用如下的SQL语句也可以生成第i页,每页n行，tid是主键列，select top n * from tab where strWhere and tid(select max(tid) fro

=oConn.Execute("SELECT * FROM Books") while not oRs.Eof strSQL = "SELECT * FROM Authors WHERE AuthorID="oRs("AuthorID") oRs2=oConn.Execu

：select sum(sl0000) from xstfxps2 wheredhao00 in (select dhao00 from xstfxps1 where trunc(ywrq00)=tru

大家讨论讨论。SELECT NVL(A.USERRATE, 1) AS USERRATEFROM(SELECT USERRATE , 1 AS TTT

SQL Server 数据库管理常用的SQL和TSQL:1. 查看数据库的版本select @@version2. 查看数据库所在机器操作系统参数exec

select tname,tabtype from (select tname,tabtype,row_number() over ( order by tname ) rn from

如下：SELECT LogID,UserID,LogTime,Url,Description,(case OperateType when OperateType = 0 then ''新增

[Q]怎么知道那些表没有建立主键[A]一般的情况下，表的主键是必要的，没有主键的表可以说是不符合设计规范的。SELECT table_nameFROM User_tables t