[英]Case when to return multiple values
這是我的表格,在日常情況下,我將使用解碼來顯示以下值,但是,我需要在特定報告的1列中顯示所有值,因為它們對應於同一項目。
T1:
Id V1 V2 V3 V4 V5 V5_Text
1 1 1 1 0 0 Other
2 0 1 1 0 1 Other
3 0 0 1 0 1 QWE
4 0 0 1 1 0 ABC
5 1 0 0 0 1 Other
我使用的情況是,但似乎無法返回超過1的值。
select id,
case when V1=1, then 'A'
when V2=1, then 'B'
when V3=1, then 'C'
when V4=1, then 'D'
when V5=1, then v5_text
預期產量:
1 A,B,C,Other
2 B,C,Other
3 C,QWE
4 C,D,ABC
5 A,Other
實際輸出:
1 Other
2 Other
3 QWE
4 ABC
5 Other
您需要串聯這些值:
select id,
trim(',' from
(case when V1 = 1 then 'A,' end) ||
case when V2 = 1 then 'B,' end) ||
case when V3 = 1 then 'C,' end) ||
case when V4 = 1 then 'D,' end) ||
case when V5 = 1 then v5_text
)
)
不知道您還有什么想法,也不知道這個表有多大,但是另一種方法是“取消透視”該v1 ... v5結構,然后使用listagg()
順便說一句:第一行
Id V1 V2 V3 V4 V5 V5_Text
1 1 1 1 0 0 Other
A B C -- there is no "other" here
Oracle 11g R2架構設置 :
CREATE TABLE Table1
(ID int, V1 int, V2 int, V3 int, V4 int, V5 int, V5_TEXT varchar2(5))
;
INSERT ALL
INTO Table1 (ID, V1, V2, V3, V4, V5, V5_TEXT)
VALUES (1, 1, 1, 1, 0, 0, 'Other')
INTO Table1 (ID, V1, V2, V3, V4, V5, V5_TEXT)
VALUES (2, 0, 1, 1, 0, 1, 'Other')
INTO Table1 (ID, V1, V2, V3, V4, V5, V5_TEXT)
VALUES (3, 0, 0, 1, 0, 1, 'QWE')
INTO Table1 (ID, V1, V2, V3, V4, V5, V5_TEXT)
VALUES (4, 0, 0, 1, 1, 0, 'ABC')
INTO Table1 (ID, V1, V2, V3, V4, V5, V5_TEXT)
VALUES (5, 1, 0, 0, 0, 1, 'Other')
SELECT * FROM dual
;
查詢1 :
select
id, listagg(alpha,',') within group (order by alpha) codes_concat
from (
select id, v1, V5_TEXT, 'A' alpha from table1 where v1 = 1 union all
select id, v2, V5_TEXT, 'B' alpha from table1 where v2 = 1 union all
select id, v3, V5_TEXT, 'C' alpha from table1 where v3 = 1 union all
select id, v4, V5_TEXT, 'D' alpha from table1 where v4 = 1 union all
select id, v5, V5_TEXT, 'Other' from table1 where v5 = 1
) d
group by
id
結果 :
| ID | CODES_CONCAT |
|----|--------------|
| 1 | A,B,C |
| 2 | B,C,Other |
| 3 | C,Other |
| 4 | C,D |
| 5 | A,Other |
編輯
如果工會冒犯了所有人,那么還有其他方法:
select
id, listagg(alpha,',') within group (order by alpha) codes_concat
from (
select
id
, V5_TEXT
, case when cj.n = 1 then v1
when cj.n = 2 then v2
when cj.n = 3 then v3
when cj.n = 4 then v4
when cj.n = 5 then v5 end v1
, case when cj.n = 1 then 'A'
when cj.n = 2 then 'B'
when cj.n = 3 then 'C'
when cj.n = 4 then 'D'
when cj.n = 5 then V5_TEXT end alpha
from table1
cross join (
Select level n from dual connect by level<=5
) cj
) d
where v1 <> 0
group by
id
;
或可以使用樞軸等。
select
id, listagg(alpha,',') within group (order by alpha) codes_concat
from (
select
id, v5_text, v1
, case when vname = 'V1' then 'A'
when vname = 'V2' then 'B'
when vname = 'V3' then 'C'
when vname = 'V4' then 'D'
when vname = 'V5' then v5_text end alpha
from table1
UNPIVOT (
v1 FOR( vname ) IN ( v1, v2, v3, v4, v5
)
)
) d
where v1 <> 0
group by
id
;
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