在列中显示分组的行

Question

如何根据分组条件将多个行分组到一组列中？

例如，

ID       Type            Total     
==============================
36197   Deduction         -9
36200   Deduction         -1
36337   Deduction          1
36363   Deduction          0
36364   Deduction          0
36200   Safety            -1
36342   Safety             0
36350   Safety            10
36363   Safety             0
36364   Safety             1   

向

ID      Deduction       Safety
==========================================
36197    -9              0
36200    -1             -1
36337     1              0
36363     0              0
36364     0              1
36342     0              0
36350     0              10

Answer 1

您可以使用案例陈述来有条件地汇总：

select      id,
            sum(case when type = 'Deduction' then total else 0 end) as deduction,
            sum(case when type = 'Safety' then total else 0 end) as safety
from        tbl
group by    id

Answer 2

SELECT DISTINCT ID, (SELECT TOTAL FROM TABLE AS A WHERE A.ID = X.ID AND A.TYPE = 'DEDUCTION') AS DEDUCTION,(SELECT TOTAL FROM TABLE AS B WHERE B.ID = X.ID AND B.TYPE = 'SAFETY') AS SAFETY
FROM TABLE AS X;

Answer 3

您也可以使用pivot解决。

select * from tableA
pivot (
max(total) for type in (Deduction,  Safety) 
) as pvt