select top 用法

大家好，又见面了，我是你们的朋友全栈君。

access：


select top (10) * from table1 where 1=1 




db2：


select column from table where 1=1 fetch first 10 rows only 


取第三行到第5行的记录


select * from (select row_number()  over() as row from table) as temp where row>=3 and row<=5






mysql：


select * from table1 where 1=1 limit 10 




sql server:

读取前10条：select top (10) * from table1 where 1=1 


读取后10条：select top (10) * from table1 order by id desc


在sqlserver里面，如何读取按照某个排序，第5到10这五个记录


select top 6 * from table where id not in(select top 4 id from table)




oracle：


select * from table1 where rownum<=10


取中间记录：60~100

select * from (select rownum r,a.* from table a where rownum <= 100) where r >= 60; 

db2 update多行

update table1 set fild = (select t2.fild from table2 t2 where t2.name =table1 .name);

table2 数据要确保唯一性

db2更改表名

RENAME TABLE table TO  table1;

db2表结构一样，数据拷贝

insertinto table  select * from table2;

db2取最大值的记录

select * from table1 t1 where t1.name=(select max(date1) from table1 t2 where t2.name=t1.name)