Rows and columns written several
Column switch:
1. The simplest wording, using the keyword PIVOT
语法：SELECT * FROM TABLENAME PIVOT(MAX(LIST1) FOR LIST2 IN (VALUES1,VALUES2,VALUES3,VALUES4))
example:
To achieve the ranks of transitions:
代码：SELECT * FROM S PIVOT(MAX(AMT) FOR Q IN (1,2,3,4))
2. Using analytic functions load / lag ranks were converted
Code:
SELECT S.Y, S.AMT Q1, S.LD1 Q2, S.LD2 Q3, S.LD3 Q4
FROM (SELECT S.*,
LEAD(S.AMT, 1) OVER(PARTITION BY S.Y ORDER BY S.Q) LD1,
LEAD(S.AMT, 2) OVER(PARTITION BY S.Y ORDER BY S.Q) LD2,
LEAD(S.AMT, 3) OVER(PARTITION BY S.Y ORDER BY S.Q) LD3
FROM S) S
WHERE S.Q = 1
3. Use the decode function converts the ranks
Code:
SELECT S.Y,
SUM(DECODE(S.Q, 1, AMT, NULL)) Q1,
SUM(DECODE(S.Q, 2, AMT, NULL)) Q2,
SUM(DECODE(S.Q, 3, AMT, NULL)) Q3,
SUM(DECODE(S.Q, 4, AMT, NULL)) Q4
FROM S
GROUP BY S.Y
4. associated portion
Code:
SELECT S.Y, S.AMT Q1, A.AMT Q2, B.AMT Q3, C.AMT Q4
FROM S,
(SELECT * FROM S WHERE S.Q = 2) A,
(SELECT * FROM S WHERE S.Q = 3) B,
(SELECT * FROM S WHERE S.Q = 4) C
WHERE S.Y = A.Y
AND S.Y = B.Y
AND S.Y = C.Y
AND S.Q=1
行转列：UNPIVOT
代码：WITH A AS (SELECT * FROM S PIVOT(MAX(AMT) FOR Q IN (1 Q1,2 Q2,3 Q3,4 Q4))) SELECT * FROM A UNPIVOT(AMT FOR Q IN (Q1,Q2,Q3,Q4))
