[英]mysql subquery ERROR [21000][1241] Operand should contain 1 column(s)
I have a table called counterparty. 我有一张桌子叫做交易对手。 I'm going to have a query on this table Something like this:
我将在此表上进行查询,如下所示:
SELECT (`name`, `mark`, `parent`, `description`) AS table_1 FROM (SELECT
`name`, `mark`, `parent`, `description` FROM counterparty) AS table_2 WHERE
(table_1.mark <> table_2.parent);
But the error below shows: 但是下面的错误显示:
[21000][1241] Operand should contain 1 column(s) [21000] [1241]操作数应包含1列
how can i fix it? 我该如何解决?
you did wrong to write subquery you can try like below by using join 您编写子查询错了,可以通过使用join尝试如下
SELECT t1.* from table_1 t1
join (SELECT
`name`, `mark`, `parent`, `description` FROM counterparty
) AS table_2 t2 on t1.mark!=t2.mark
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