04 2021 档案
摘要：-- 1，切换数据库 use `information_schema`; -- 2，查看数据库使用大小 select concat(round(sum(data_length/1024/1024),2),'MB') as data from tables where table_schema='we
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摘要：SQL DELETE FROM work WHERE id IN ( SELECT w.id FROM work w LEFT JOIN user u ON w.user_id=u.id WHERE w.url='https://www.hello.cn/works/id8353954' AND w
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