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
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
# "mtr --ps" returns different values in "Max length"
--disable_ps_protocol
# view protocol createincorrect table name
--disable_view_protocol
--enable_metadata
--vertical_results
SELECT
a AS ___________a,
CASE WHEN a IS NOT NULL THEN a END AS case_______a,
CASE WHEN a IS NOT NULL THEN a ELSE a END AS case_____a_a,
COALESCE(a) AS coalesce___a,
COALESCE(a, a) AS coalesce_a_a,
IF(a IS NULL, a, a) AS if_______a_a,
IFNULL(a, a) AS ifnull___a_a,
LEAST(a, a) AS least____a_a,
GREATEST(a, a) AS greatest_a_a,
b AS ___________b,
CASE WHEN a IS NOT NULL THEN b END AS case_______b,
CASE WHEN a IS NOT NULL THEN b ELSE b END AS case_____b_b,
COALESCE(b) AS coalesce___b,
COALESCE(b, b) AS coalesce_b_b,
IF(a IS NULL, b, b) AS if_______b_b,
IFNULL(b, b) AS ifnull___b_b,
LEAST(b, b) AS least____b_b,
GREATEST(b, b) AS greatest_b_b
FROM t1;
SELECT
CASE WHEN a IS NOT NULL THEN a ELSE b END AS case_____a_b,
CASE WHEN a IS NOT NULL THEN b ELSE a END AS case_____b_a,
COALESCE(a, b) AS coalesce_a_b,
COALESCE(b, a) AS coalesce_b_a,
IF(a IS NULL, a, b) AS if_______a_b,
IF(a IS NULL, b, a) AS if_______b_a,
IFNULL(a, b) AS ifnull___a_b,
IFNULL(b, a) AS ifnull___b_a,
LEAST(a, b) AS least____a_b,
LEAST(b, a) AS least____b_a,
GREATEST(a, b) AS greatest_a_b,
GREATEST(b, a) AS greatest_b_a
FROM t1;
--horizontal_results
--disable_metadata
--enable_ps_protocol
--enable_view_protocol
CREATE TABLE t2 AS
SELECT
a AS ___________a,
CASE WHEN a IS NOT NULL THEN a END AS case_______a,
CASE WHEN a IS NOT NULL THEN a ELSE a END AS case_____a_a,
COALESCE(a) AS coalesce___a,
COALESCE(a, a) AS coalesce_a_a,
IF(a IS NULL, a, a) AS if_______a_a,
IFNULL(a, a) AS ifnull___a_a,
LEAST(a, a) AS least____a_a,
GREATEST(a, a) AS greatest_a_a,
b AS ___________b,
CASE WHEN a IS NOT NULL THEN b END AS case_______b,
CASE WHEN a IS NOT NULL THEN b ELSE b END AS case_____b_b,
COALESCE(b) AS coalesce___b,
COALESCE(b, b) AS coalesce_b_b,
IF(a IS NULL, b, b) AS if_______b_b,
IFNULL(b, b) AS ifnull___b_b,
LEAST(b, b) AS least____b_b,
GREATEST(b, b) AS greatest_b_b
FROM t1;
SHOW CREATE TABLE t2;
DROP TABLE t2;
SET STATEMENT sql_mode = 'NO_ENGINE_SUBSTITUTION' FOR
CREATE TABLE t2 AS
SELECT
CASE WHEN a IS NOT NULL THEN a ELSE b END AS case_____a_b,
CASE WHEN a IS NOT NULL THEN b ELSE a END AS case_____b_a,
COALESCE(a, b) AS coalesce_a_b,
COALESCE(b, a) AS coalesce_b_a,
IF(a IS NULL, a, b) AS if_______a_b,
IF(a IS NULL, b, a) AS if_______b_a,
IFNULL(a, b) AS ifnull___a_b,
IFNULL(b, a) AS ifnull___b_a,
LEAST(a, b) AS least____a_b,
LEAST(b, a) AS least____b_a,
GREATEST(a, b) AS greatest_a_b,
GREATEST(b, a) AS greatest_b_a
FROM t1;
SHOW CREATE TABLE t2;
DROP TABLE t2;
|
