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1# 2009 December 9
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.
12#
13# This file implements tests for N-way joins (N>2) which make
14# use of USING or NATURAL JOIN.  For such joins, the USING and
15# NATURAL JOIN processing needs to search all tables to the left
16# of the join looking for a match.  See ticket [f74beaabde]
17# for additional information.
18#
19
20set testdir [file dirname $argv0]
21source $testdir/tester.tcl
22
23
24# The problem as initially reported on the mailing list:
25#
26do_test join6-1.1 {
27  execsql {
28    CREATE TABLE t1(a);
29    CREATE TABLE t2(a);
30    CREATE TABLE t3(a,b);
31    INSERT INTO t1 VALUES(1);
32    INSERT INTO t3 VALUES(1,2);
33
34    SELECT * FROM t1 LEFT JOIN t2 USING(a) LEFT JOIN t3 USING(a);
35  }
36} {1 2}
37do_test join6-1.2 {
38  execsql {
39    SELECT t1.a, t3.b
40      FROM t1 LEFT JOIN t2 ON t1.a=t2.a LEFT JOIN t3 ON t2.a=t3.a;
41  }
42} {1 {}}
43do_test join6-1.3 {
44  execsql {
45    SELECT t1.a, t3.b
46      FROM t1 LEFT JOIN t2 ON t1.a=t2.a LEFT JOIN t3 ON t1.a=t3.a;
47  }
48} {1 2}
49
50
51do_test join6-2.1 {
52  execsql {
53    DROP TABLE t1;
54    DROP TABLE t2;
55    DROP TABLE t3;
56
57    CREATE TABLE t1(x,y);
58    CREATE TABLE t2(y,z);
59    CREATE TABLE t3(x,z);
60
61    INSERT INTO t1 VALUES(1,2);
62    INSERT INTO t1 VALUES(3,4);
63
64    INSERT INTO t2 VALUES(2,3);
65    INSERT INTO t2 VALUES(4,5);
66
67    INSERT INTO t3 VALUES(1,3);
68    INSERT INTO t3 VALUES(3,5);
69
70    SELECT * FROM t1 JOIN t2 USING (y) JOIN t3 USING(x);
71  }
72} {1 2 3 3 3 4 5 5}
73do_test join6-2.2 {
74  execsql {
75    SELECT * FROM t1 NATURAL JOIN t2 NATURAL JOIN t3;
76  }
77} {1 2 3 3 4 5}
78
79
80do_test join6-3.1 {
81  execsql {
82    DROP TABLE t1;
83    DROP TABLE t2;
84    DROP TABLE t3;
85
86    CREATE TABLE t1(a,x,y);
87    INSERT INTO t1 VALUES(1,91,92);
88    INSERT INTO t1 VALUES(2,93,94);
89
90    CREATE TABLE t2(b,y,z);
91    INSERT INTO t2 VALUES(3,92,93);
92    INSERT INTO t2 VALUES(4,94,95);
93
94    CREATE TABLE t3(c,x,z);
95    INSERT INTO t3 VALUES(5,91,93);
96    INSERT INTO t3 VALUES(6,99,95);
97
98    SELECT * FROM t1 NATURAL JOIN t2 NATURAL JOIN t3;
99  }
100} {1 91 92 3 93 5}
101do_test join6-3.2 {
102  execsql {
103    SELECT * FROM t1 JOIN t2 NATURAL JOIN t3;
104  }
105} {1 91 92 3 92 93 5}
106do_test join6-3.3 {
107  execsql {
108    SELECT * FROM t1 JOIN t2 USING(y) NATURAL JOIN t3;
109  }
110} {1 91 92 3 93 5}
111do_test join6-3.4 {
112  execsql {
113    SELECT * FROM t1 NATURAL JOIN t2 JOIN t3 USING(x,z);
114  }
115} {1 91 92 3 93 5}
116do_test join6-3.5 {
117  execsql {
118    SELECT * FROM t1 NATURAL JOIN t2 JOIN t3 USING(x);
119  }
120} {1 91 92 3 93 5 93}
121do_test join6-3.6 {
122  execsql {
123    SELECT * FROM t1 NATURAL JOIN t2 JOIN t3 USING(z);
124  }
125} {1 91 92 3 93 5 91 2 93 94 4 95 6 99}
126
127do_test join6-4.1 {
128  execsql {
129    SELECT * FROM
130       (SELECT 1 AS a, 91 AS x, 92 AS y UNION SELECT 2, 93, 94)
131       NATURAL JOIN t2 NATURAL JOIN t3
132  }
133} {1 91 92 3 93 5}
134do_test join6-4.2 {
135  execsql {
136    SELECT * FROM t1 NATURAL JOIN
137       (SELECT 3 AS b, 92 AS y, 93 AS z UNION SELECT 4, 94, 95)
138       NATURAL JOIN t3
139  }
140} {1 91 92 3 93 5}
141do_test join6-4.3 {
142  execsql {
143    SELECT * FROM t1 NATURAL JOIN t2 NATURAL JOIN
144       (SELECT 5 AS c, 91 AS x, 93 AS z UNION SELECT 6, 99, 95)
145  }
146} {1 91 92 3 93 5}
147
148
149
150
151
152
153
154
155
156
157
158finish_test
159