在oracle中获取表的转置

Question

我有这张出勤表：

days     emp1    emp2    emp3    emp4
1        P       P       A       P
2        P       P       P       P
3        P       A       P       L
4        A       P       P       A

我希望在Oracle中转置它。我想要一个像这样的输出：

     1 2 3 4
emp1 P P P A
emp2 P P A P
emp3 A P P P
emp4 P P L A

Answer 1

我认为我设法用一个枢轴操作员做你想做的事情（这件事看起来太复杂了，无法轻松实现）：

with w as
(
  select * from 
  (
    select t.days, t.emp1, t.emp2, t.emp3, t.emp4
    from my_table t
  )
  pivot (max(emp1) emp1, max(emp2) emp2, max(emp3) emp3, max(emp4) emp4 for (days) in (1 as a1, 2 as a2, 3 as a3, 4 as a4))
)
select w.a1_emp1 d1, w.a2_emp1 d2, w.a1_emp1 d3, w.a1_emp1 d4 from w
union all
select w.a1_emp2 d1, w.a2_emp2 d2, w.a3_emp2 d3, w.a4_emp2 d4 from w
union all
select w.a1_emp3 d1, w.a2_emp3 d2, w.a3_emp3 d3, w.a4_emp3 d4 from w
union all
select w.a1_emp4 d1, w.a2_emp4 d2, w.a3_emp4 d3, w.a4_emp4 d4 from w
;

你得到：

D1  D2  D3  D4
P   P   P   P
P   P   A   P
A   P   P   P
P   P   L   A