有一个这样的行集:
| ID | OP_CODE | OWNER | MEASURE | COUNT |
|----|-------------|-------|----------|-------|
| 1 | Operation 1 | 1 | Geometry | 42 |
| 2 | Operation 1 | 1 | Geometry | 48 |
| 3 | Operation 1 | 1 | Vacuum | 29 |
| 4 | Operation 1 | 1 | Electro | 14 |
| 5 | Operation 1 | 2 | Geometry | 87 |
| 6 | Operation 1 | 2 | Geometry | 112 |
| 7 | Operation 1 | 2 | Vacuum | 78 |
| 8 | Operation 1 | 3 | Vacuum | 56 |
| 9 | Operation 1 | 3 | Electro | 78 |
我要按所有者对行进行分组,并将其他度量值(列度量值的值)与列计数之和合并/联接到此结果,如下所示:
| OWNER | GEOMETRY_CNT | VACUUM_CNT | ELECTRO_CNT | TOTAL_CNT |
|-------|--------------|------------|-------------|-----------|
| 1 | 90 | 29 | 14 | 133 |
| 2 | 199 | 78 | (null) | 277 |
| 3 | (null) | 56 | 78 | 134 |
在这种情况下,几何碳纳米管、真空碳纳米管、电子碳纳米管是第一表中相应值的总和:
所有者几何结构=42+48=90;
所有者真空度=29;
业主电力公司=14;
业主合计=29+14+90=133;
我怎样才能拿到这一排?
SQL Fiddle
最佳答案
试试这个:
SELECT a.OWNER, SUM(IF(a.MEASURE = 'Geometry', a.COUNT, 0)) GEOMETRY_CNT,
SUM(IF(a.MEASURE = 'Vacuum', a.COUNT, 0)) VACUUM_CNT,
SUM(IF(a.MEASURE = 'Electro', a.COUNT, 0)) ELECTRO_CNT,
SUM(a.COUNT) TOTAL_CNT
FROM operations_schedule a
GROUP BY a.OWNER
检查SQL FIDDLE DEMO
输出
| OWNER | GEOMETRY_CNT | VACUUM_CNT | ELECTRO_CNT | TOTAL_CNT |
|-------|--------------|------------|-------------|-----------|
| 1 | 90 | 29 | 14 | 133 |
| 2 | 199 | 78 | 0 | 277 |
| 3 | 0 | 56 | 78 | 134 |
关于mysql - 用sum和join对行进行分组(构建摘要),我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/20769472/