全部博文
-
编辑 删除
oracle 常用SQL语句
alter user account unlock; desc <> select * from <> select xx,xx from <> select xx,xx "别名" from <>; 任何含有空值的数学表达式都是空值！ select xx||xx from <>; 字符连接相当于JAVA“+” select xx||'字符' from <>; select xx||'das''dasd' from <>; 消除重复的行：select distinct xx from <>; 消除组合重复的行：select distinct xx,xx from <>; select * from <> where xx = > < <> XX; select ename,sal from emp where sal be
