问题
Hi I have a table test its structure is given below:
**Testing**
PK C1 c2
---------------
1 v11 v12
2 v21 v23
3 v31 v32
Now I need to query this table (testing) such that I get the below output.
Pk Key value
---------------
1 c1 v11
1 c1 v12
2 c2 v21
2 c2 v22
3 c3 v31
3 c3 v32
Can this been possible with sql query in Oracle 11g ,Is it possible with PIVOT feature in 11g?
回答1:
No, it can't be done with PIVOT
, but it can be done with UNPIVOT:
SELECT
Pk,
"Key",
value
FROM Testing
UNPIVOT (
value FOR "Key" IN (C1, C2)
)
And when UNPIVOT
is unavailable, I often unpivot like this:
SELECT
t.Pk,
x."Key",
CASE x."Key"
WHEN 'C1' THEN t.C1
WHEN 'C2' THEN t.C2
END AS value
FROM Testing t
CROSS JOIN (
SELECT 'C1' AS "Key" FROM DUAL UNION ALL
SELECT 'C2' FROM DUAL
) x
来源:https://stackoverflow.com/questions/9408622/desired-output-with-given-table-data