Gordon Linoff
2019-07-03 22:37
您可以在子句中创建派生表FROM：
SELECT i.id, (t.id is not null) AS status
FROM (SELECT 1 as id UNION ALL SELECT 5 UNION ALL SELECT 10 UNION ALL SELECT 15 UNION ALL SELECT 20
) i LEFT JOIN
mytable t
ON i.id = t.id;
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啊，我从来没有使用过这样的派生表，而只是动态地生成
IN列表。可能会变得又大又丑（可能有成千上万的行）。有问题吗 也许最好将它留给应用程序？@ user1032531最好留给应用程序
@ M0rtiis会的。谢谢