1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
-- redshift_pivot.sql
/* Examples of SELECT statements that include PIVOT expressions. */
-- Below examples come from
-- https://docs.aws.amazon.com/redshift/latest/dg/r_FROM_clause-pivot-unpivot-examples.html
SELECT *
FROM (SELECT
partname,
price
FROM part) PIVOT (
AVG(price) FOR partname IN ('P1', 'P2', 'P3')
);
SELECT *
FROM (SELECT
quality,
manufacturer
FROM part) PIVOT (
COUNT(*) FOR quality IN (1, 2, NULL)
);
SELECT *
FROM (SELECT
quality,
manufacturer
FROM part) PIVOT (
COUNT(*) AS count FOR quality IN (1 AS high, 2 AS low, NULL AS na)
);
-- End of AWS-provided examples
-- Can do PIVOTs for CTEs
WITH bear_diet AS (
SELECT
bear_id,
bear_species,
food_eaten
FROM bear_facts
)
SELECT *
FROM bear_diet
PIVOT ( COUNT(*) AS num_ate_food
FOR bear_species IN (
'polar bear',
'brown bear',
'american black bear',
'asian black bear',
'giant panda',
'spectacled bear',
'sloth bear',
'sun bear'
)
);
-- Can do Pivots for tables
SELECT *
FROM orders PIVOT (COUNT(*) FOR color IN ('red', 'blue'));
-- Can also alias the pivoted table
SELECT *
FROM (SELECT
quality,
manufacturer
FROM part) PIVOT (
COUNT(*) FOR quality IN (1, 2, NULL)
) AS quality_matrix;
|
