如何在 MySQL 中对当前月份记录求和?
mysqlmysqli database更新于 2024/1/9 12:16:00
要对当前月份记录求和，请使用 SUM() 和 MONTH() 函数。让我们首先创建一个表 −
mysql> create table DemoTable1889 ( DueDate date, Amount int ); Query OK, 0 rows affected (0.00 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable1889 values('2019-12-11',500);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1889 values('2019-11-11',1000);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1889 values('2018-12-04',700);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1889 values('2017-12-10',300);
Query OK, 1 row affected (0.00 sec)
使用 select 语句显示表中的所有记录 −
mysql> select * from DemoTable1889;
这将产生以下输出 −
+------------+--------+ | DueDate | Amount | +------------+--------+ | 2019-12-11 | 500 | | 2019-11-11 | 1000 | | 2018-12-04 | 700 | | 2017-12-10 | 300 | +------------+--------+ 4 rows in set (0.00 sec)
当前日期如下 −
mysql> select curdate(); +------------+ | curdate() | +------------+ | 2019-12-10 | +------------+ 1 row in set (0.00 sec)
这是在 MySQL 中对当前月份记录求和的查询 −
mysql> select sum(Amount) from DemoTable1889 where MONTH(DueDate)=MONTH(curdate());
这将产生以下输出 −
+-------------+ | sum(Amount) | +-------------+ | 1500 | +-------------+ 1 row in set (0.00 sec)
