Add null values when pivoting SQL - Oracle [duplicate] - sql

Question

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Oracle SQL pivot query
(4 answers)
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I have a table with stock prices ordered by dates. I only have those 5 stocks, but I have hundreds of dates. I would like to pivot the stocks, but I have no idea on how to do that.
Data:
Date |Stock| Price |
30/09/22 | A | 100.5 |
30/09/22 | B | 151.3 |
30/09/22 | C | 233.4 |
30/09/22 | D | 237.2 |
30/09/22 | E | 38.42 |
01/10/22 | A | 101.5 |
01/10/22 | B | ----- |
01/10/22 | C | 237.6 |
01/10/22 | D | 232.2 |
01/10/22 | E | 38.54 |
Desired results:
Date | A | B | C | D | E |
30/09/22 |100.5|151.3|233.4|237.2|38.42|
01/10/22 |101.5|-----|237.6|232.2|38.54|

Answer 1

You can use conditional aggregation method to achieve your desired result -
SELECT Date,
MAX(CASE WHEN Stock = 'A' THEN Price END) AS A,
MAX(CASE WHEN Stock = 'B' THEN Price END) AS B,
MAX(CASE WHEN Stock = 'C' THEN Price END) AS C,
MAX(CASE WHEN Stock = 'D' THEN Price END) AS D,
MAX(CASE WHEN Stock = 'E' THEN Price END) AS E
FROM DATA
GROUP BY Date;
Another Oracle specific answer could be -
SELECT *
FROM DATA
PIVOT(MAX(PRICE) FOR Stock IN ('A' AS A, 'B' AS B, 'C' AS C, 'D' AS D, 'E' AS E));
Demo.

Answer 2

Use PIVOT:
SELECT *
FROM table_name
PIVOT (
MAX(price) FOR stock IN ('A' AS a, 'B' AS b, 'C' AS c, 'D' AS d, 'E' AS e)
)
Which, for your sample data:
CREATE TABLE table_name ( "DATE", Stock, Price ) AS
SELECT DATE '2022-09-30', 'A', 100.5 FROM DUAL UNION ALL
SELECT DATE '2022-09-30', 'B', 151.3 FROM DUAL UNION ALL
SELECT DATE '2022-09-30', 'C', 233.4 FROM DUAL UNION ALL
SELECT DATE '2022-09-30', 'D', 237.2 FROM DUAL UNION ALL
SELECT DATE '2022-09-30', 'E', 38.42 FROM DUAL UNION ALL
SELECT DATE '2022-10-01', 'A', 101.5 FROM DUAL UNION ALL
SELECT DATE '2022-10-01', 'B', NULL FROM DUAL UNION ALL
SELECT DATE '2022-10-01', 'C', 237.6 FROM DUAL UNION ALL
SELECT DATE '2022-10-01', 'D', 232.2 FROM DUAL UNION ALL
SELECT DATE '2022-10-01', 'E', 38.52 FROM DUAL;
Note: DATE is a reserved word and it is bad practice to use it as an identifier. If you must use it as an identifier (don't) then you will need to use a quoted identifier (with the correct case) everywhere it is going to be used.
Outputs:
DATE
A
B
C
D
E
2022-09-30 00:00:00
100.5
151.3
233.4
237.2
38.42
2022-10-01 00:00:00
101.5
null
237.6
232.2
38.52
fiddle