SELECT .. INTO返回多个行-Mysql [英] SELECT .. INTO returns more than one rows - Mysql
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问题描述
我有一个基本的存储过程
i have a basic stored procedure
DECLARE user_o VARCHAR(50);
SELECT user_name INTO user_o FROM users WHERE topic_id = 54 AND entry_time BETWEEN
2017-09-17 AND date_add( CURRENT_DATE, INTERVAL 1 DAY) ORDER BY entry_time ASC
LIMIT 10;
这将引发错误#1172 sql返回多个行.不知道为什么吗?
this throws me error #1172 sql returns more than one rows. no idea why?
我的目标是设置此结果
user_name | user_o
mike mike
liz liz
helen helen
her her
推荐答案
这是因为您要在结果"INTO"中插入变量,并且结果不只是单个值,因此会出现错误.
Its because you are inserting the result 'INTO' a variable and because the result is more than a single value, hence the error.
您有10个限制,请尝试将其更改为1,这样可以解决该问题,如果要返回多个值,则需要在记录集中进行管理.
You have a limit of 10, try changing to 1, that will fix it, if you want multiple values returned then you need to manage these in a recordset.
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