求和命令
mysql> select SUM(price) from order where create_time>’2016-03-12′;
+————+
| SUM(price) |
+————+
| 37.40 |
+————+
1 row in set
求和命令
mysql> select SUM(price) from order where create_time>’2016-03-12′;
+————+
| SUM(price) |
+————+
| 37.40 |
+————+
1 row in set
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