MySQL DML操作--------实现pivot行转列功能最佳实战
mysql> select year, sum(orderCount1) '第一季度',-> sum(orderCount2) '第二季度',
-> sum(orderCount3) '第三季度',
-> sum(orderCount4) '第四季度'
-> from
-> (
-> select year,
-> case when season = '一季度' then
-> orderCount
-> end orderCount1,
-> case when season = '二季度' then
-> orderCount
-> end orderCount2,
-> case when season = '三季度' then
-> orderCount
-> end orderCount3,
-> case when season = '四季度' then
-> orderCount
-> end orderCount4
-> from t_temp
-> ) t
-> group by year;
+---------+--------------+--------------+--------------+--------------+
| year | 第一季度 | 第二季度 | 第三季度 | 第四季度 |
+---------+--------------+--------------+--------------+--------------+
| 2010年| 100 | 200 | 300 | 400 |
| 2011年| 150 | 300 | 450 | 600 |
+---------+--------------+--------------+--------------+--------------+
2 rows in set (0.00 sec)
页:
[1]