[英]mysql subquery ERROR [21000][1241] Operand should contain 1 column(s)
我有一张桌子叫做交易对手。 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);
但是下面的错误显示:
[21000] [1241]操作数应包含1列
我该如何解决?
您可以在下面尝试-使用SELF JOIN
SELECT table_1 .`name`, table_1.`mark`, table_1.`parent`, table_1 .`description`
FROM counterparty table_1 inner join counterparty table_2
table_1.mark <> table_2.parent;
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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