如何在 MySQL 中累加当前月份的记录?
要累加当前月份的记录,请使用 SUM() 和 MONTH() 函数。首先,让我们创建一个表 -
mysql> create table DemoTable1889 ( DueDate date, Amount int ); Query OK, 0 rows affected (0.00 sec)
使用 insert 命令向表中插入一些记录 -
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 语句从表中显示所有记录 -
mysql> select * from DemoTable1889;
这将生成以下输出 -
+------------+--------+ | 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)
以下是累加 MySQL 中当前月份记录的查询 -
mysql> select sum(Amount) from DemoTable1889 where MONTH(DueDate)=MONTH(curdate());
这将生成以下输出 -
+-------------+ | sum(Amount) | +-------------+ | 1500 | +-------------+ 1 row in set (0.00 sec)
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