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Mysql -- UPDATE table SET column = SELECT COUNT(*) FROM (SELECT * FROM table2 WHERE table2.id = table.id)) 不可能
Mysql -- UPDATE table SET column = SELECT COUNT(*) FROM ( SELECT * FROM table2 WHERE table2.id = table.id ) ) Impossible(Mysql -- UPDATE table SET column = SELECT COUNT(*) FROM (SELECT * FROM table2 WHERE table2.id = table.id)) 不可能)
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