SQL 找出多个字段满足其中一个字段的新写法
找出TABLE1中
Column1 满足value1
或者
Column2 满足value2
或者
Column3 满足value3
的纪录
SELECT top 10 * from TABLE1
WHERE
CASE WHEN COLUMN1='value1' THEN 1
ELSE
(CASE WHEN COLUMN2='value2' THEN 1
ELSE
(CASE WHEN COLUMN3=value3 THEN 1 ELSE 0 END)
END)
END =1
相关文档：
INSERT INTO
tableName ( columnName1, columnName2, columnName3, columnName4)
VALUES ( '45', '西藏办', TO_Date( '2010-03-10 12:00:00', 'YYYY-MM-DD HH24:MI:SS'), NULL,);
commit; ......
SELECT g.rid, room_no, planed_count,cc from
(SELECT rid,room_no, planed_count from YC_HOTEL_ROOM_T ) r
left join
(SELECT rid,count(*) cc from YC_GUEST_INFO_T group by rid ) g
ON r.rid = g.rid WHERE planed_ ......
alert index mem_ct monitoring usage;
desc v$object_usage;
set linesize 190
select * from v$object_usage;
SQL>SET AUTOTRACE ON;
*autotrace功能只能在SQL*PLUS里使用
其他一些使用方法：
2.2.1、在SQLPLUS中得到语句总的执行时间
SQL> set timing on;
2.2.2、只显示执行计划--(会同� ......
1、查询两个时间之间
select * from [tablename] where date between \'value1\' and \'value2\'
2、显示最后回复时间
select a.title,a.username,b.adddate from table a,(select max(adddate) adddate from table where table.title=a.title) b
3、日程安排提前5分钟提醒
select * from 日程安排 w ......
分页查询的原理：
这个只能用再Sql2005及以上的版本
DECLARE @pagenum AS INT, @pagesize AS INT
SET @pagenum = 2
SET @pagesize = 3
SELECT *
from (SELECT ROW_NUMBER()&n ......
