比如 表 table1，分类 type，读取分类前5条，合并在联查，并且排序
select * from
(
SELECT top 5 * FROM table1 where type=1
UNION
SELECT top 5 * FROM table1 where type=2
UNION
SELECT top 5 * FROM table1 where type=3
) as table_new order by id desc
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