mysql - 语法是什么

Question

我正在尝试运行这段代码，但我得到了不止一行(这就是我想要的)，但显然 := 运算符只能处理一个值。我需要什么才能返回多行(一列)，以便我可以将其插入下一个选择语句

set @oids :=(

    SELECT OBJECT_ID
    FROM aaa K
    WHERE K.TYPE IN ('ISSN', 'ISBN') 
    GROUP BY K.OBJECT_ID
    HAVING count(distinct K.TYPE) = 2

);

select * 
from aaa
where OBJECT_ID in (@oids);

Answer 1

仅使用不带变量的单个查询

select * 
from aaa
where OBJECT_ID in (SELECT OBJECT_ID
                    FROM aaa K
                    WHERE K.`TYPE` IN ('ISSN', 'ISBN') 
                    GROUP BY K.OBJECT_ID
                    HAVING count(distinct K.TYPE) = 2
                   );