SQL语句复习[专题五] 单行子查询:只会得到一个结果的子查询[子查询的内容必须放在小括号中.在查询语句中的查询语句 ]--查询所有比 CLARK 员工 工资高的员工--1.先查询 CLARK 员工的工资select sal from emp where ename='CLARK'--2450--2.然后拿着CLARK的工资去比较select * from emp where sal > 2450 order by sal--3.合二为一 => 子查询 select * from emp wh
SQL语句获取数据库中的表主键,自增列,所有列 获取表主键 1:SELECT TABLE_NAME,COLUMN_NAME FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGEWHERE TABLE_NAME<>'dtproperties' 2:EXEC sp_pkeys @table_name='表名' 3: select o.name as 表名,c.name as 字段名,k.colid as 字段序号,k.keyno as 索引顺序,t.name as
Mybatis 删除多条数据XML SQL语句删除 1.删除多条数据SQL写法 <delete id="deleteParamsByIds"> delete from ts_sys_params where id in <foreach collection="array" open="(" close=")" item="item" separator="," >
获取当前时间的代码:xml文件中 <td><div align="center"><br/><strong>送检时间</strong></div></td><td><br/> <script type="text/javascript"> function getNowFormatDate() { var date = new Date(); va
话说有一文章表article,存储文章的添加文章的时间是add_time字段,该字段为int()类型的,现需要查询今天添加的文章总数并且按照时间从大到小排序,则查询语句如下: select * from `article` where date_format(from_UNIXTIME(`add_time`),'%Y-%m-%d') = date_format(now(),'%Y-%m-%d'); 或者: select * from `article` where to_days(date_fo
下面的sql语句可以查看表的信息.其中modify_date和create_date可以根据表的修改时间来查看.如果不需要删除后,就能看到所有表的字段信息 ) PERCENT d.name AS 表名, ISNULL(f.value, '') AS 表说明, a.name AS 字段名, CASE WHEN EXISTS ( FROM sysobjects WHERE xtype = 'PK' AND name IN (SELECT name FROM sysindexes WHERE indi
set statistics profile on set statistics io on set statistics time on go <这里写上你的语句...> go set statistics profile off set statistics io off set statistics time off SET STATISTICS TIME ON ...sql SET STATISTICS TIME off