SQLite

Check-in [68c168b5e5]
Login

Many hyperlinks are disabled.
Use anonymous login to enable hyperlinks.

Overview
Comment:Added test cases based on Bruce Momjian's talk on SQL NULLs.
Downloads: Tarball | ZIP archive
Timelines: family | ancestors | is-distinct-from
Files: files | file ages | folders
SHA1: 68c168b5e57aebc1ffd79006068aa99e78b59ee0
User & Date: drh 2015-06-13 19:05:44.010
Context
2015-06-13
19:05
Added test cases based on Bruce Momjian's talk on SQL NULLs. (Leaf check-in: 68c168b5e5 user: drh tags: is-distinct-from)
11:48
Add the IS DISTINCT FROM and IS NOT DISTINCT FROM operators. (check-in: 0be4478209 user: drh tags: is-distinct-from)
Changes
Unified Diff Ignore Whitespace Patch
Added test/momjian1.test.












































































































































































































































































































































































































































































































































>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
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
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
# 2015-06-12
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# 
# Test cases derived from Bruce Momjian's talk on NULL handling in SQL.
# http://momjian.us/main/writings/pgsql/nulls.pdf
#
set testdir [file dirname $argv0]
source $testdir/tester.tcl

db null nil
do_execsql_test momjian1-100 {
  SELECT null;
} {nil}

do_execsql_test momjian1-110 {
  CREATE TABLE nulltest (x INTEGER, y INTEGER);
  INSERT INTO nulltest VALUES (1,NULL);
  SELECT * FROM nulltest;
} {1 nil}

do_execsql_test momjian1-120 {
  INSERT INTO nulltest (x) VALUES (2);
  SELECT * FROM nulltest;
} {1 nil 2 nil}

do_catchsql_test momjian1-130 {
  CREATE TABLE nulltest2 (x INTEGER NOT NULL, y INTEGER NOT NULL);
  INSERT INTO nulltest2 VALUES (3,NULL )
} {1 {NOT NULL constraint failed: nulltest2.y}}
do_catchsql_test momjian1-131 {
  INSERT INTO nulltest2 (x) VALUES (4);
} {1 {NOT NULL constraint failed: nulltest2.y}}

do_execsql_test momjian1-140 {
  SELECT NULL+1;
} {nil}
do_execsql_test momjian1-141 {
  SELECT NULL || 'a';
} {nil}
do_execsql_test momjian1-142 {
  SELECT 'b' || NULL;
} {nil}

do_execsql_test momjian1-150 {
  CREATE TABLE inctest (x INTEGER);
  INSERT INTO inctest VALUES (30), (40),(NULL);
  SELECT x + 1 FROM inctest;
} {31 41 nil}

do_execsql_test momjian1-160 {
  SELECT NULL = 1;
} {nil}
do_execsql_test momjian1-161 {
  SELECT NULL = '';
} {nil}
do_execsql_test momjian1-162 {
  SELECT NULL = NULL;
} {nil}
do_execsql_test momjian1-163 {
  SELECT NULL < NULL + 1;
} {nil}

do_execsql_test momjian1-170 {
  SELECT 1 WHERE 1;
} {1}
do_execsql_test momjian1-171 {
  SELECT 1 WHERE 0;
} {}
do_execsql_test momjian1-172 {
  SELECT 1 WHERE NULL;
} {}

do_execsql_test momjian1-180 {
  SELECT 1 AND NULL;
} {nil}
do_execsql_test momjian1-181 {
  SELECT NOT NULL;
} {nil}

do_execsql_test momjian1-190 {
  SELECT * FROM inctest WHERE x >= 0;
} {30 40}
do_execsql_test momjian1-191 {
  SELECT * FROM inctest WHERE x < 0;
} {}
do_execsql_test momjian1-192 {
  SELECT * FROM inctest WHERE x < 0 OR x >= 0;
} {30 40}

do_execsql_test momjian1-200 {
  SELECT * FROM inctest WHERE x <> 10;
} {30 40}
do_execsql_test momjian1-201 {
  SELECT * FROM inctest WHERE x <> 10 OR x = 10;    
} {30 40}

do_execsql_test momjian1-210 {
  SELECT 1 <> 2 AND 1 <> 3;
} {1}
do_execsql_test momjian1-211 {
  SELECT 1 <> 2 AND 1 <> 3 AND 1 <> NULL;
} {nil}

do_execsql_test momjian1-220 {
  SELECT 'a' IN (SELECT NULL);
} {nil}
do_execsql_test momjian1-221 {
  SELECT 'a' NOT IN (SELECT NULL);
} {nil}

do_execsql_test momjian1-230 {
  SELECT 'a' IN (SELECT 'a' UNION ALL SELECT NULL);
} {1}
do_execsql_test momjian1-231 {
  SELECT 'a' NOT IN (SELECT 'a' UNION ALL SELECT NULL);
} {0}
do_execsql_test momjian1-232 {
  SELECT 'a' IN (SELECT 'b' UNION ALL SELECT NULL);
} {nil}
do_execsql_test momjian1-233 {
  SELECT 'a' NOT IN (SELECT 'b' UNION ALL SELECT NULL);
} {nil}

do_execsql_test momjian1-240 {
  SELECT 'a' = 'b' OR 'a' = NULL;
} {nil}
do_execsql_test momjian1-241 {
  SELECT 'a' <> 'b' AND 'a' <> NULL;
} {nil}

do_execsql_test momjian1-250 {
  SELECT NULL = NULL;
} {nil}
do_execsql_test momjian1-251 {
  SELECT NULL IS NULL;
} {1}
do_execsql_test momjian1-252 {
  SELECT NULL IS NOT NULL;
} {0}

do_execsql_test momjian1-260 {
  SELECT * FROM inctest WHERE x IS NULL;
} {nil}
do_execsql_test momjian1-261 {
  SELECT * FROM inctest WHERE x IS NOT NULL;
} {30 40}

do_execsql_test momjian1-270 {
  SELECT 2 IS DISTINCT FROM 1;
  SELECT 2 IS NOT 1
} {1 1}
do_execsql_test momjian1-271 {
  SELECT NULL IS DISTINCT FROM 1;
  SELECT NULL IS NOT 1;
} {1 1}
do_execsql_test momjian1-272 {
  SELECT NULL IS DISTINCT FROM NULL;
  SELECT NULL IS NOT NULL;
} {0 0}
do_execsql_test momjian1-273 {
  SELECT NULL <> 1;
} {nil}

do_execsql_test momjian1-280 {
  -- SELECT * FROM inctest WHERE x IS DISTINCT FROM 30;
  SELECT * FROM inctest WHERE x IS NOT 30;
} {40 nil}
do_execsql_test momjian1-281 {
  -- SELECT * FROM inctest WHERE x IS NOT DISTINCT FROM 30;
  SELECT * FROM inctest WHERE x IS 30;
} {30}

do_execsql_test momjian1-300 {
  CREATE TABLE disttest (x INTEGER, y INTEGER);
  INSERT INTO disttest VALUES (1, 1), (2, 3), (NULL, NULL);
  SELECT * FROM disttest where x IS NOT DISTINCT FROM y;
  SELECT * FROM disttest WHERE x IS y;
} {1 1 nil nil 1 1 nil nil}

do_execsql_test momjian1-310 {
  WITH ordertest AS (
    SELECT NULL
    UNION ALL
    SELECT 2
    UNION ALL
    SELECT 1
    UNION ALL
    SELECT NULL
  )
  SELECT * FROM ordertest
  ORDER BY 1;
} {nil nil 1 2}

do_execsql_test momjian1-320 {
  CREATE TABLE uniqtest (x INTEGER);
  CREATE UNIQUE INDEX i_uniqtest ON uniqtest (x);
  INSERT INTO uniqtest VALUES (1),(NULL), (NULL);
  SELECT * FROM uniqtest;
} {1 nil nil}

do_execsql_test momjian1-330 {
  CREATE TABLE aggtest (x INTEGER);
  INSERT INTO aggtest VALUES (7), (8), (NULL);
  SELECT COUNT(*), COUNT(x), SUM(x), MIN(x), MAX(x), AVG(x) FROM aggtest;
} {3 2 15 7 8 7.5}
do_execsql_test momjian1-331 {
  DELETE FROM aggtest;
  SELECT COUNT(*), COUNT(x), SUM(x), MIN(x), MAX(x), AVG(x) FROM aggtest;
} {0 0 nil nil nil nil}

do_execsql_test momjian1-340 {
  DELETE FROM aggtest;
  INSERT INTO aggtest VALUES (7), (8), (NULL), (NULL);
  SELECT x, COUNT(*), COUNT(x), SUM(x), MIN(x), MAX(x), AVG(x)
    FROM aggtest
   GROUP BY x ORDER BY x;
} {nil 2 0 nil nil nil nil 7 1 1 7 7 7 7.0 8 1 1 8 8 8 8.0}

do_execsql_test momjian1-350 {
  SELECT COALESCE(NULL, 0);
} {0}
do_execsql_test momjian1-351 {
  SELECT COALESCE(NULL, 'I am null.');
} {{I am null.}}

do_execsql_test momjian1-352 {
  CREATE TABLE nullmaptest(x TEXT);
  INSERT INTO nullmaptest VALUES ('f'), ('g'), (NULL);
  SELECT x, COALESCE(x, 'n/a') FROM nullmaptest;
} {f f g g nil n/a}
do_execsql_test momjian1-353 {
  SELECT 'a' || COALESCE(NULL, '') || 'b';
} {ab}
do_execsql_test momjian1-354 {
  SELECT SUM(x), COALESCE(SUM(x), 0) FROM aggtest;
} {15 15}
do_execsql_test momjian1-355 {
  DELETE FROM aggtest;
  SELECT SUM(x), COALESCE(SUM(x), 0) FROM aggtest;
} {nil 0}

do_execsql_test momjian1-360 {
  CREATE TABLE emptytest (x INTEGER);
  SELECT * from emptytest;
} {}
do_execsql_test momjian1-361 {
  SELECT (SELECT * from emptytest);
} {nil}
do_execsql_test momjian1-362 {
  SELECT (SELECT * from emptytest) IS NULL;
} {1}


finish_test