具有内部依赖关系的MySQL查询

假设我有一个有三列的表：user\u to，user\u from，counter。我正在尝试执行一个查询，该查询检查同一个表中的交叉引用检查。也许这有助于理解：

SELECT user_to AS user_to1
    , user_from AS user_to2
FROM tbl
WHERE counter > 10
    AND NOT EXISTS (
        SELECT *
        FROM tbl
        WHERE user_to = user_from1
            AND user_from = user_to1
        )

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我假设我试图做错事，但查询有助于理解我试图完成的任务。

您可以在其上添加一个

别名

SELECT user_to AS user_to1
    , user_from AS user_to2
FROM tbl a
WHERE counter > 10
    AND NOT EXISTS (
        SELECT *
        FROM tbl b
        WHERE b.user_to = a.user_to
            AND b.user_from = a.user_from
        )