summaryrefslogtreecommitdiff
path: root/mysql-test/t/case.test
blob: e1c807fe32be21b40d0b4b4efdcaf340cc1023e2 (plain)
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
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175

# Testing of CASE
#

--disable_warnings
drop table if exists t1, t2;
--enable_warnings

select CASE "b" when "a" then 1 when "b" then 2 END;
select CASE "c" when "a" then 1 when "b" then 2 END;
select CASE "c" when "a" then 1 when "b" then 2 ELSE 3 END;
select CASE BINARY "b" when "a" then 1 when "B" then 2 WHEN "b" then "ok" END;
select CASE "b" when "a" then 1 when binary "B" then 2 WHEN "b" then "ok" END;
select CASE concat("a","b") when concat("ab","") then "a" when "b" then "b" end;
select CASE when 1=0 then "true" else "false" END;
select CASE 1 when 1 then "one" WHEN 2 then "two" ELSE "more" END;
explain extended select CASE 1 when 1 then "one" WHEN 2 then "two" ELSE "more" END;
select CASE 2.0 when 1 then "one" WHEN 2.0 then "two" ELSE "more" END;
select (CASE "two" when "one" then "1" WHEN "two" then "2" END) | 0;
select (CASE "two" when "one" then 1.00 WHEN "two" then 2.00 END) +0.0;
select case 1/0 when "a" then "true" else "false" END;
select case 1/0 when "a" then "true" END;
select (case 1/0 when "a" then "true" END) | 0;
select (case 1/0 when "a" then "true" END) + 0.0;
select case when 1>0 then "TRUE" else "FALSE" END;
select case when 1<0 then "TRUE" else "FALSE" END;

#
# Test bug when using GROUP BY on CASE
#
create table t1 (a int);
insert into t1 values(1),(2),(3),(4);
select case a when 1 then 2 when 2 then 3 else 0 end as fcase, count(*) from t1 group by fcase;
explain extended select case a when 1 then 2 when 2 then 3 else 0 end as fcase, count(*) from t1 group by fcase;
select case a when 1 then "one" when 2 then "two" else "nothing" end as fcase, count(*) from t1 group by fcase;
drop table t1;

#
# Test MAX(CASE ... ) that can return null
#

create table t1 (row int not null, col int not null, val varchar(255) not null);
insert into t1 values (1,1,'orange'),(1,2,'large'),(2,1,'yellow'),(2,2,'medium'),(3,1,'green'),(3,2,'small');
select max(case col when 1 then val else null end) as color from t1 group by row;
drop table t1;

SET NAMES latin1;

#
# CASE and argument types/collations aggregation into result 
#
CREATE TABLE t1 SELECT 
 CASE WHEN 1 THEN _latin1'a' COLLATE latin1_danish_ci ELSE _latin1'a' END AS c1,
 CASE WHEN 1 THEN _latin1'a' ELSE _latin1'a' COLLATE latin1_danish_ci END AS c2,
 CASE WHEN 1 THEN 'a' ELSE  1  END AS c3,
 CASE WHEN 1 THEN  1  ELSE 'a' END AS c4,
 CASE WHEN 1 THEN 'a' ELSE 1.0 END AS c5,
 CASE WHEN 1 THEN 1.0 ELSE 'a' END AS c6,
 CASE WHEN 1 THEN  1  ELSE 1.0 END AS c7,
 CASE WHEN 1 THEN 1.0 ELSE  1  END AS c8,
 CASE WHEN 1 THEN 1.0 END AS c9,
 CASE WHEN 1 THEN 0.1e1 else 0.1 END AS c10,
 CASE WHEN 1 THEN 0.1e1 else 1 END AS c11,
 CASE WHEN 1 THEN 0.1e1 else '1' END AS c12
;
SHOW CREATE TABLE t1;
DROP TABLE t1;

--error 1267
SELECT CASE 
  WHEN 1 
  THEN _latin1'a' COLLATE latin1_danish_ci 
  ELSE _latin1'a' COLLATE latin1_swedish_ci
  END;

--error 1270
SELECT CASE _latin1'a' COLLATE latin1_general_ci
  WHEN _latin1'a' COLLATE latin1_danish_ci  THEN 1
  WHEN _latin1'a' COLLATE latin1_swedish_ci THEN 2
  END;

SELECT 
CASE _latin1'a' COLLATE latin1_general_ci  WHEN _latin1'A' THEN '1' ELSE 2 END,
CASE _latin1'a' COLLATE latin1_bin         WHEN _latin1'A' THEN '1' ELSE 2 END,
CASE _latin1'a' WHEN _latin1'A' COLLATE latin1_swedish_ci THEN '1' ELSE 2 END,
CASE _latin1'a' WHEN _latin1'A' COLLATE latin1_bin        THEN '1' ELSE 2 END
;

#
# COALESCE is a CASE abbrevation:
#
# COALESCE(v1,v2) == CASE WHEN v1 IS NOT NULL THEN v1 ELSE v2 END
#
# COALESCE(V1, V2, . . . ,Vn ) =  
#     CASE WHEN V1 IS NOT NULL THEN V1 ELSE COALESCE (V2, . . . ,Vn) END
#
# Check COALESCE argument types aggregation

--error 1267
CREATE TABLE t1 SELECT COALESCE(_latin1'a',_latin2'a');
--error 1267
CREATE TABLE t1 SELECT COALESCE('a' COLLATE latin1_swedish_ci,'b' COLLATE latin1_bin);
CREATE TABLE t1 SELECT 
 COALESCE(1), COALESCE(1.0),COALESCE('a'),
 COALESCE(1,1.0), COALESCE(1,'1'),COALESCE(1.1,'1'),
 COALESCE('a' COLLATE latin1_bin,'b');
explain extended SELECT 
 COALESCE(1), COALESCE(1.0),COALESCE('a'),
 COALESCE(1,1.0), COALESCE(1,'1'),COALESCE(1.1,'1'),
 COALESCE('a' COLLATE latin1_bin,'b');
SHOW CREATE TABLE t1;
DROP TABLE t1;

--error 1267
CREATE TABLE t1 SELECT IFNULL('a' COLLATE latin1_swedish_ci, 'b' COLLATE latin1_bin);

# Test for BUG#10151
SELECT 'case+union+test'
UNION 
SELECT CASE LOWER('1') WHEN LOWER('2') THEN 'BUG' ELSE 'nobug' END;

SELECT CASE LOWER('1') WHEN LOWER('2') THEN 'BUG' ELSE 'nobug' END;

SELECT 'case+union+test'
UNION 
SELECT CASE '1' WHEN '2' THEN 'BUG' ELSE 'nobug' END;

#
# Bug #17896: problem with MIN(CASE...)
#

create table t1(a float, b int default 3);
insert into t1 (a) values (2), (11), (8);
select min(a), min(case when 1=1 then a else NULL end),
  min(case when 1!=1 then NULL else a end) 
from t1 where b=3 group by b;
drop table t1;


#
# Tests for bug #9939: conversion of the arguments for COALESCE and IFNULL
#

CREATE TABLE t1 (EMPNUM INT);
INSERT INTO t1 VALUES (0), (2);
CREATE TABLE t2 (EMPNUM DECIMAL (4, 2));
INSERT INTO t2 VALUES (0.0), (9.0);

SELECT COALESCE(t2.EMPNUM,t1.EMPNUM) AS CEMPNUM,
               t1.EMPNUM AS EMPMUM1, t2.EMPNUM AS EMPNUM2
  FROM t1 LEFT JOIN t2 ON t1.EMPNUM=t2.EMPNUM;

SELECT IFNULL(t2.EMPNUM,t1.EMPNUM) AS CEMPNUM,
               t1.EMPNUM AS EMPMUM1, t2.EMPNUM AS EMPNUM2
  FROM t1 LEFT JOIN t2 ON t1.EMPNUM=t2.EMPNUM;

DROP TABLE t1,t2;

--echo End of 4.1 tests

#
# #30782: Truncated UNSIGNED BIGINT columns 
#
create table t1 (a int, b bigint unsigned);
create table t2 (c int);
insert into t1 (a, b) values (1,4572794622775114594), (2,18196094287899841997),
  (3,11120436154190595086);
insert into t2 (c) values (1), (2), (3);
select t1.a, (case t1.a when 0 then 0 else t1.b end) d from t1 
  join t2 on t1.a=t2.c order by d;
select t1.a, (case t1.a when 0 then 0 else t1.b end) d from t1 
  join t2 on t1.a=t2.c where b=11120436154190595086 order by d;
drop table t1, t2;

--echo End of 5.0 tests