java_數據庫

  數據庫概述 SELECT t2.name,t1.minPrice from test2 as t2 JOIN( SELECT t.id,MIN(t.price)as minPrice from test AS t GROUP BY t.type) as t1 on t2.id = t1.id 樂觀鎖 買家不是很多，可以使用樂觀鎖。

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