如何使用子查询来定义 Mysql SELECT LIMIT 偏移量? [英] How to use subquery to define Mysql SELECT LIMIT offset?

问题描述

I have been trying to define "dynamically" the offset of a query.

But when executing this query I always end up with a You have an error in your SQL syntax;

When I do remplace the subquery by a number it does work fine. Is there something wrong in a query that has this shape?

SELECT LengthOfStay
FROM table1
LIMIT (SELECT CAST(COUNT(DISTINCT(LengthOfStay)) / 2 AS SIGNED) FROM table1 t1), 2;

Ps. I casted it so I can make sure it's an integer.

解决方案

You can not use a subquery as a LIMIT argument. Limit argument should be an INTEGER. Your subquery returns, well... basically, a table.

What are trying to achieve by this query anyway? This query does not make any sense to me...

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