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判断在某段时间内
一.select * from table where talbe.time between to_date('2006-1-15','yyyy-mm-dd') and to_date('2008-1-15','yyyy-mm-dd') order by talbe.time;

二.select * from table where talbe.time between trunc(date(formDate) )and trunc(date(toDate) )order by talbe.time;

查询匹配
select * from table where lower(table.username) like % + username.toLower()%;

三.如何获得前N条记录

1. ORACLE
SELECT * FROM TABLE1 WHERE ROWNUM<=N

2. INFORMIX
SELECT FIRST N * FROM TABLE1 where 1=1

3. DB2
SELECT * ROW_NUMBER() OVER(ORDER BY COL1 DESC) AS ROWNUM WHERE ROWNUM<=N
或者
SELECT COLUMN FROM TABLE where 1=1 FETCH FIRST N ROWS ONLY

4. SQL SERVER
SELECT TOP N * FROM TABLE1 where 1=1
or
SET ROWCOUNT N SELECT * FROM TABLE1 where 1=1 SET ROWCOUNT N1

5. SYBASE
SET ROWCOUNT N SELECT * FROM TABLE1 where 1=1 SET ROWCOUNT N1

6. MYSQL
SELECT * FROM TABLE1 where 1=1 LIMIT N

7. FOXPRO
SELECT * TOP N FROM TABLE ORDER BY COLUMN

8. ACCESS
SELECT TOP N * FROM TABLE1 where 1=1



posted on 2006-01-14 15:27 阿成 阅读(308) 评论(0)  编辑  收藏 所属分类: 数据库

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