Annotation of embedaddon/sqlite3/test/subselect.test, revision 1.1.1.1
1.1 misho 1: # 2001 September 15
2: #
3: # The author disclaims copyright to this source code. In place of
4: # a legal notice, here is a blessing:
5: #
6: # May you do good and not evil.
7: # May you find forgiveness for yourself and forgive others.
8: # May you share freely, never taking more than you give.
9: #
10: #***********************************************************************
11: # This file implements regression tests for SQLite library. The
12: # focus of this file is testing SELECT statements that are part of
13: # expressions.
14: #
15: # $Id: subselect.test,v 1.16 2008/08/04 03:51:24 danielk1977 Exp $
16:
17: set testdir [file dirname $argv0]
18: source $testdir/tester.tcl
19:
20: # Omit this whole file if the library is build without subquery support.
21: ifcapable !subquery {
22: finish_test
23: return
24: }
25:
26: # Basic sanity checking. Try a simple subselect.
27: #
28: do_test subselect-1.1 {
29: execsql {
30: CREATE TABLE t1(a int, b int);
31: INSERT INTO t1 VALUES(1,2);
32: INSERT INTO t1 VALUES(3,4);
33: INSERT INTO t1 VALUES(5,6);
34: }
35: execsql {SELECT * FROM t1 WHERE a = (SELECT count(*) FROM t1)}
36: } {3 4}
37:
38: # Try a select with more than one result column.
39: #
40: do_test subselect-1.2 {
41: set v [catch {execsql {SELECT * FROM t1 WHERE a = (SELECT * FROM t1)}} msg]
42: lappend v $msg
43: } {1 {only a single result allowed for a SELECT that is part of an expression}}
44:
45: # A subselect without an aggregate.
46: #
47: do_test subselect-1.3a {
48: execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=2)}
49: } {2}
50: do_test subselect-1.3b {
51: execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=4)}
52: } {4}
53: do_test subselect-1.3c {
54: execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=6)}
55: } {6}
56: do_test subselect-1.3d {
57: execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=8)}
58: } {}
59: ifcapable compound {
60: do_test subselect-1.3e {
61: execsql {
62: SELECT b FROM t1
63: WHERE a = (SELECT a FROM t1 UNION SELECT b FROM t1 ORDER BY 1);
64: }
65: } {2}
66: }
67:
68: # What if the subselect doesn't return any value. We should get
69: # NULL as the result. Check it out.
70: #
71: do_test subselect-1.4 {
72: execsql {SELECT b from t1 where a = coalesce((SELECT a FROM t1 WHERE b=5),1)}
73: } {2}
74:
75: # Try multiple subselects within a single expression.
76: #
77: do_test subselect-1.5 {
78: execsql {
79: CREATE TABLE t2(x int, y int);
80: INSERT INTO t2 VALUES(1,2);
81: INSERT INTO t2 VALUES(2,4);
82: INSERT INTO t2 VALUES(3,8);
83: INSERT INTO t2 VALUES(4,16);
84: }
85: execsql {
86: SELECT y from t2
87: WHERE x = (SELECT sum(b) FROM t1 where a notnull) - (SELECT sum(a) FROM t1)
88: }
89: } {8}
90:
91: # Try something useful. Delete every entry from t2 where the
92: # x value is less than half of the maximum.
93: #
94: do_test subselect-1.6 {
95: execsql {DELETE FROM t2 WHERE x < 0.5*(SELECT max(x) FROM t2)}
96: execsql {SELECT x FROM t2 ORDER BY x}
97: } {2 3 4}
98:
99: # Make sure sorting works for SELECTs there used as a scalar expression.
100: #
101: do_test subselect-2.1 {
102: execsql {
103: SELECT (SELECT a FROM t1 ORDER BY a), (SELECT a FROM t1 ORDER BY a DESC)
104: }
105: } {1 5}
106: do_test subselect-2.2 {
107: execsql {
108: SELECT 1 IN (SELECT a FROM t1 ORDER BY a);
109: }
110: } {1}
111: do_test subselect-2.3 {
112: execsql {
113: SELECT 2 IN (SELECT a FROM t1 ORDER BY a DESC);
114: }
115: } {0}
116:
117: # Verify that the ORDER BY clause is honored in a subquery.
118: #
119: ifcapable compound {
120: do_test subselect-3.1 {
121: execsql {
122: CREATE TABLE t3(x int);
123: INSERT INTO t3 SELECT a FROM t1 UNION ALL SELECT b FROM t1;
124: SELECT * FROM t3 ORDER BY x;
125: }
126: } {1 2 3 4 5 6}
127: } ;# ifcapable compound
128: ifcapable !compound {
129: do_test subselect-3.1 {
130: execsql {
131: CREATE TABLE t3(x int);
132: INSERT INTO t3 SELECT a FROM t1;
133: INSERT INTO t3 SELECT b FROM t1;
134: SELECT * FROM t3 ORDER BY x;
135: }
136: } {1 2 3 4 5 6}
137: } ;# ifcapable !compound
138:
139: do_test subselect-3.2 {
140: execsql {
141: SELECT sum(x) FROM (SELECT x FROM t3 ORDER BY x LIMIT 2);
142: }
143: } {3}
144: do_test subselect-3.3 {
145: execsql {
146: SELECT sum(x) FROM (SELECT x FROM t3 ORDER BY x DESC LIMIT 2);
147: }
148: } {11}
149: do_test subselect-3.4 {
150: execsql {
151: SELECT (SELECT x FROM t3 ORDER BY x);
152: }
153: } {1}
154: do_test subselect-3.5 {
155: execsql {
156: SELECT (SELECT x FROM t3 ORDER BY x DESC);
157: }
158: } {6}
159: do_test subselect-3.6 {
160: execsql {
161: SELECT (SELECT x FROM t3 ORDER BY x LIMIT 1);
162: }
163: } {1}
164: do_test subselect-3.7 {
165: execsql {
166: SELECT (SELECT x FROM t3 ORDER BY x DESC LIMIT 1);
167: }
168: } {6}
169: do_test subselect-3.8 {
170: execsql {
171: SELECT (SELECT x FROM t3 ORDER BY x LIMIT 1 OFFSET 2);
172: }
173: } {3}
174: do_test subselect-3.9 {
175: execsql {
176: SELECT (SELECT x FROM t3 ORDER BY x DESC LIMIT 1 OFFSET 2);
177: }
178: } {4}
179: do_test subselect-3.10 {
180: execsql {
181: SELECT x FROM t3 WHERE x IN
182: (SELECT x FROM t3 ORDER BY x DESC LIMIT 1 OFFSET 2);
183: }
184: } {4}
185:
186: # Ticket #2295.
187: # Make sure type affinities work correctly on subqueries with
188: # an ORDER BY clause.
189: #
190: do_test subselect-4.1 {
191: execsql {
192: CREATE TABLE t4(a TEXT, b TEXT);
193: INSERT INTO t4 VALUES('a','1');
194: INSERT INTO t4 VALUES('b','2');
195: INSERT INTO t4 VALUES('c','3');
196: SELECT a FROM t4 WHERE b IN (SELECT b FROM t4 ORDER BY b);
197: }
198: } {a b c}
199: do_test subselect-4.2 {
200: execsql {
201: SELECT a FROM t4 WHERE b IN (SELECT b FROM t4 ORDER BY b LIMIT 1);
202: }
203: } {a}
204: do_test subselect-4.3 {
205: execsql {
206: SELECT a FROM t4 WHERE b IN (SELECT b FROM t4 ORDER BY b DESC LIMIT 1);
207: }
208: } {c}
209:
210: finish_test
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