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Sql Server 取出多个字段列中的最大值和最小值

现有表table1 , 四个int型字段 F1,F2,F3,F4；现要查询得到四列中的最大值 , 并只需要返回最大值方法一： select case when F12>F34 then F12 else F34 end as Ma...

SQL Server中根据某个字段，ID字段自动增长的实现

创建一个表，根据Description的不同，各自对应的ID起点不同，需求: 1、管理员ID从1000开始自增，自增量为1 2、系主任ID从2000开始自增，自增量为1 3、普通教师ID从3000开始自增，自增量为1 创建表语句如下： create table C ( ID int, Descri...

如何在 PolarDB-X 中优化慢 SQL

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SQL Server中sys.syslogin中updatedate字段的浅析

在系统视图sys.syslogins中，有createdate与updatedate两个字段，分别表示创建登录名与更新登录名的日期，如果你用updatedate的值来判断一个登录名的权限是否被修改过，那么你就要跳坑里了。当然sys.sysusers视图里面updatedate字段也不能作为某个use...

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更新时间 2023-06-16 18:23:47

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