MYSQL單表中各記錄總和統計 適用於報表

用case when then else 語句，用法如同if. select sum(if(id<500,1,0)) as A,sum(if(id>=500 && id<1000,1,0)) as B from customer;  +---+-----+ | A | B   | +---+-----+ | 4 | 204 | +---+-----+ 1 row in setspa     這樣是

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