現在有表資料如下圖1
需要刪除表中除id外重複的資料，實現如下圖所示效果圖2
篩選根據name，value分組後id最大的非重複資料：select max(id) from deleterepeat group by (name+value);
下面是實現效果圖2 的語句
delete from deleterepeat where id not in(select max(id) from deleterepeat group by (name+value))
實現效果等於下邊語句
select * from deleterepeat where id in(select max(id) from deleterepeat group by (name+value));
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