xref: /sqlite-3.40.0/test/select5.test (revision 4dcbdbff) 
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 aggregate functions and the
13# GROUP BY and HAVING clauses of SELECT statements.
14#
15# $Id: select5.test,v 1.9 2005/01/26 03:58:36 danielk1977 Exp $
16
17set testdir [file dirname $argv0]
18source $testdir/tester.tcl
19
20# Build some test data
21#
22execsql {
23  CREATE TABLE t1(x int, y int);
24  BEGIN;
25}
26for {set i 1} {$i<32} {incr i} {
27  for {set j 0} {pow(2,$j)<$i} {incr j} {}
28  execsql "INSERT INTO t1 VALUES([expr {32-$i}],[expr {10-$j}])"
29}
30execsql {
31  COMMIT
32}
33
34do_test select5-1.0 {
35  execsql {SELECT DISTINCT y FROM t1 ORDER BY y}
36} {5 6 7 8 9 10}
37
38# Sort by an aggregate function.
39#
40do_test select5-1.1 {
41  execsql {SELECT y, count(*) FROM t1 GROUP BY y ORDER BY y}
42} {5 15 6 8 7 4 8 2 9 1 10 1}
43do_test select5-1.2 {
44  execsql {SELECT y, count(*) FROM t1 GROUP BY y ORDER BY count(*), y}
45} {9 1 10 1 8 2 7 4 6 8 5 15}
46do_test select5-1.3 {
47  execsql {SELECT count(*), y FROM t1 GROUP BY y ORDER BY count(*), y}
48} {1 9 1 10 2 8 4 7 8 6 15 5}
49
50# Some error messages associated with aggregates and GROUP BY
51#
52do_test select5-2.1 {
53  set v [catch {execsql {
54    SELECT y, count(*) FROM t1 GROUP BY z ORDER BY y
55  }} msg]
56  lappend v $msg
57} {1 {no such column: z}}
58do_test select5-2.2 {
59  set v [catch {execsql {
60    SELECT y, count(*) FROM t1 GROUP BY z(y) ORDER BY y
61  }} msg]
62  lappend v $msg
63} {1 {no such function: z}}
64do_test select5-2.3 {
65  set v [catch {execsql {
66    SELECT y, count(*) FROM t1 GROUP BY y HAVING count(*)<3 ORDER BY y
67  }} msg]
68  lappend v $msg
69} {0 {8 2 9 1 10 1}}
70do_test select5-2.4 {
71  set v [catch {execsql {
72    SELECT y, count(*) FROM t1 GROUP BY y HAVING z(y)<3 ORDER BY y
73  }} msg]
74  lappend v $msg
75} {1 {no such function: z}}
76do_test select5-2.5 {
77  set v [catch {execsql {
78    SELECT y, count(*) FROM t1 GROUP BY y HAVING count(*)<z ORDER BY y
79  }} msg]
80  lappend v $msg
81} {1 {no such column: z}}
82
83# Get the Agg function to rehash in vdbe.c
84#
85do_test select5-3.1 {
86  execsql {
87    SELECT x, count(*), avg(y) FROM t1 GROUP BY x HAVING x<4 ORDER BY x
88  }
89} {1 1 5.0 2 1 5.0 3 1 5.0}
90
91# Run various aggregate functions when the count is zero.
92#
93do_test select5-4.1 {
94  execsql {
95    SELECT avg(x) FROM t1 WHERE x>100
96  }
97} {{}}
98do_test select5-4.2 {
99  execsql {
100    SELECT count(x) FROM t1 WHERE x>100
101  }
102} {0}
103do_test select5-4.3 {
104  execsql {
105    SELECT min(x) FROM t1 WHERE x>100
106  }
107} {{}}
108do_test select5-4.4 {
109  execsql {
110    SELECT max(x) FROM t1 WHERE x>100
111  }
112} {{}}
113do_test select5-4.5 {
114  execsql {
115    SELECT sum(x) FROM t1 WHERE x>100
116  }
117} {0.0}
118
119# Some tests for queries with a GROUP BY clause but no aggregate functions.
120#
121# Note: The query in test case 5-5.5 are not legal SQL. So if the
122# implementation changes in the future and it returns different results,
123# this is not such a big deal.
124#
125do_test select5-5.1 {
126  execsql {
127    CREATE TABLE t2(a, b, c);
128    INSERT INTO t2 VALUES(1, 2, 3);
129    INSERT INTO t2 VALUES(1, 4, 5);
130    INSERT INTO t2 VALUES(6, 4, 7);
131    CREATE INDEX t2_idx ON t2(a);
132  }
133} {}
134do_test select5-5.2 {
135  execsql {
136    SELECT a FROM t2 GROUP BY a;
137  }
138} {1 6}
139do_test select5-5.3 {
140  execsql {
141    SELECT a FROM t2 WHERE a>2 GROUP BY a;
142  }
143} {6}
144do_test select5-5.4 {
145  execsql {
146    SELECT a, b FROM t2 GROUP BY a, b;
147  }
148} {1 2 1 4 6 4}
149do_test select5-5.5 {
150  execsql {
151    SELECT a, b FROM t2 GROUP BY a;
152  }
153} {1 2 6 4}
154
155finish_test
156
157