如何计算关联的寄存器？

Question

我有这个表，我需要一个查询，它返回每个tabla寄存器有多少UPDATE，INSERT和DELETE。

像...一样的东西。

| Tabla  | # Of Insert's | # Of Delete's | # Of Update's

我不知道它是否清楚，＃NoEnglishNativeSpeaker

Answer 1

你可能正在寻找这样的东西：

select
  Table,
  sum(case when Operacion = 'INSERT' then 1 else 0 end),
  sum(case when Operacion = 'DELETE' then 1 else 0 end),
  sum(case when Operacion = 'UPDATE' then 1 else 0 end)
from
  xxx
group by
  Table

Answer 2

你在寻找像这样的东西：

select a.tabla,a.insertCount,b.updateCount,c.deleteCount
from (select
      Tabla,
      count(*) as insertCount
    from table
    where Operation = 'INSERT'
    group by
      Tabla)a,

(select
      Tabla,
      count(*) as insertCount
    from table
    where Operation = 'UPDATE'
    group by
      Tabla)b,

(select
      Tabla,
      count(*) as deleteCount
    from table
    where Operation = 'DELETE'
    group by
      Tabla)c
where a.tabla=b.tabla  and b.tabla=c.tabla