mysql in 查询， 里面的每个条件都指定返回条数，能否实现，怎么写？

Question

mysql in 查询， 里面的每个条件都指定返回条数，能否实现，怎么写？

SELECT column_name(s)
FROM table_name
WHERE column_name IN (value1,value2)

table_name 里面包含value1和value2的值有很多条，能否指定返回条数。

类似：

select * from table_name where column_name = value1 limit 5;
select * from table_name where column_name = value2 limit 5;

或有其他方法实现这个查询？

Answer 1

It is the conversion of or/in/union all. The performance is also better than union all, and it can also meet the requirement of returning the specified number of items as you said.

(select * from table_name where column_name = value1 limit 5)
union all
(select * from table_name where column_name = value2 limit 5);

Answer 2

Your sql seems inconsistent with your description
SELECT column_name(s),count(column_name(s))
FROM table_name
WHERE column_name(s) IN (value1,value2,...)
group by column_name(s) )

There is nothing logically wrong with this way of writing, but please take a look at the execution plan after writing it. If I remember well, the efficiency of mysql's in is not high. If it is a single table, I can't think of anything good. Idea