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   

成

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case语句有条件地聚合:

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