How to store Query Result in variable using mysql

SET @v1 := SELECT COUNT(*) FROM user_rating;
SELECT @v1

When I execute this query with set variable this error is shown.

Error Code : 1064
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use
near 'SELECT count(*) FROM user_rating' at line 1


Execution Time : 00:00:00:000
Transfer Time  : 00:00:00:000
Total Time     : 00:00:00:000


(1 row(s) returned)
Execution Time : 00:00:00:343
Transfer Time  : 00:00:00:000
Total Time     : 00:00:00:343

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最佳答案

用括号包围选择。

SET @v1 := (SELECT COUNT(*) FROM user_rating);
SELECT @v1;

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此外，如果您想通过一个查询同时设置多个变量，您可以使用其他语法来设置变量，比如 SELECT @varname:=value。

一个实际的例子:

SELECT @total_count:=COUNT(*), @total_price:=SUM(quantity*price) FROM items ...

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用这个

 SELECT weight INTO @x FROM p_status where tcount='value' LIMIT 1;

经过测试，效果很好。

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Select count(*) from table_name into @var1;
Select @var1;