MySQL 如何从MySQL表中获取替代的偶数记录?
为了理解这个概念,我们将使用表 ‘Information’ 的数据如下——
mysql> Select * from Information;
+----+---------+
| id | Name |
+----+---------+
| 1 | Gaurav |
| 2 | Ram |
| 3 | Rahul |
| 4 | Aarav |
| 5 | Aryan |
| 6 | Krishan |
+----+---------+
6 rows in set (0.00 sec)
现在,以下查询将从上面的‘Information’表中获取替代的偶数记录——
mysql> Select id,Name from information group by id having mod(id,2) = 0;
+----+---------+
| id | Name |
+----+---------+
| 2 | Ram |
| 4 | Aarav |
| 6 | Krishan |
+----+---------+
3 rows in set (0.00 sec)
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