問題描述

現在的統計是這樣寫的

select column1 title,count(1) count1FROM table1WHERE column2 is not nullAND column2 > ’2016-06-13’AND column2 < ’2016-06-28’AND column3 is not nullgroup BY titlehaving count1 > 3000

現在要再加一列統計，數據是在這個基礎上再加一個條件過濾，大概就是要下面這樣的效果，要怎么寫？

select column1 title,count(1) count1,count(column3=’abc’) count2FROM table1WHERE column2 is not nullAND column2 > ’2016-06-13’AND column2 < ’2016-06-28’AND column3 is not nullgroup BY titlehaving count1 > 3000

問題解答

select column1 title,count(1) count1, sum(IF(column3=’abc’, 1, 0)) count2FROM table1WHERE column2 > ’2016-06-13’AND column2 < ’2016-06-28’AND column3 is not nullgroup BY titlehaving count1 > 3000

試試看條件中的column2 is not null沒用，可以去掉。

樓上正解，也可以試試這個，結果是一樣的

select column1 title,count(1) count1,count(column3=’abc’ or null) count2FROM table1WHERE column2 between ’2016-06-14’ and ’2016-06-27’AND column3 is not nullgroup BY titlehaving count(1) > 3000 -- 用別名count1會報錯的，這里不能用別名