使用不同的日期获得不同总数的总和

Question

我有一个交易表，我想要总结不同日期的总金额，贝娄是我的代码

SELECT SUM( total_amount ) AS total FROM transaction WHERE execution_date BETWEEN  "2015-08-1" AND  "2015-08-31" AND execution_date BETWEEN  "2015-09-1" AND  "2015-09-30"

代码只返回Null。欢迎任何帮助。

Answer 1

您应该<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/> 代替OR。由于您希望显示AND和2015-08-1" AND "2015-08-31范围内的交易， 哪个是矛盾，结果2015-09-1" AND "2015-09-30

null

OR

SELECT SUM( total_amount ) AS total FROM transaction
 WHERE execution_date BETWEEN "2015-08-1" AND "2015-08-31" 
OR execution_date BETWEEN "2015-09-1" AND "2015-09-30"

希望这有帮助