1.oracle
获取表的前100条数据.
select * from t_stu_copy where rownum<=100;(从1行开始取100行数据,第一行到第100行数据)
补充:先降序排序再获取第101条到第200条之间的所有记录
select * from t_stu_copy order by stuid desc where rownum between 100 and 200 ;---错误
select * from t_stu_copy where rownum between 100 and 200 order by stuid desc ;---错误
SELECT * FROM(SELECT ROWNUM AS rowno,t.* FROM t_stu_copy t WHERE ROWNUM <= 200 ORDER BY t.stuid DESC) a WHERE a.rowno > 100;正确
或者:select * from t_stu_copy where stuid between 101 and 200;
2.mysql
获取表的前100条数据.
select * from t_stu_copy limit 0,100;(从1行开始取100行数据,第一行到第100行数据)
补充:先降序排序再获取第101条到第200条之间的所有记录
select * from t_stu_copy order by stuid limit 100,100;(从101行开始取100行数据,第101行到第200行数据)
或者:select * from t_stu_copy where stuid between 101 and 200;
3.sqlserver
获取表的前100条数据.
select top 100 * from t_stu_copy ;
补充:先降序排序再获取第101条到第200条之间的所有记录(三种方法,不过方法a与b得到的结果是将第101条到第200条倒过来显示罢了)
a.select top 100 * from (select top 200 * from t_stu order by stuid) a order by stuid desc;
b.select top m * into 临时表(或表变量) from tablename order by columnname set rowcount n select * from 表变量 order by columnname desc.
select top 200 * into xxx from t_stu order by stuid set ROWCOUNT 100 select * from xxx order by stuid desc; xxx表示临时表变量.
c.select * from t_stu where stuid between 101 and 200.