查詢 + 添加 + 修改 一條sql 搞定~

1 .  不存在,則添加~不會自動修改spa INSERT INTO king_wz (yname,title) SELECT '42','北京' FROM dual WHERE not exists(SELECT id FROM `king_wz` where yname='42'); it 語句解析:date select not  exists(SELECT id FROM `king_wz

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