# 2009 December 9
#
# 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.
#
#***********************************************************************
# This file implements regression tests for SQLite library.
#
# This file implements tests for N-way joins (N>2) which make
# use of USING or NATURAL JOIN. For such joins, the USING and
# NATURAL JOIN processing needs to search all tables to the left
# of the join looking for a match. See ticket [f74beaabde]
# for additional information.
#
set testdir [file dirname $argv0]
source $testdir/tester.tcl
# The problem as initially reported on the mailing list:
#
do_test join6-1.1 {
execsql {
CREATE TABLE t1(a);
CREATE TABLE t2(a);
CREATE TABLE t3(a,b);
INSERT INTO t1 VALUES(1);
INSERT INTO t3 VALUES(1,2);
SELECT * FROM t1 LEFT JOIN t2 USING(a) LEFT JOIN t3 USING(a);
}
} {1 2}
do_test join6-1.2 {
execsql {
SELECT t1.a, t3.b
FROM t1 LEFT JOIN t2 ON t1.a=t2.a LEFT JOIN t3 ON t2.a=t3.a;
}
} {1 {}}
do_test join6-1.3 {
execsql {
SELECT t1.a, t3.b
FROM t1 LEFT JOIN t2 ON t1.a=t2.a LEFT JOIN t3 ON t1.a=t3.a;
}
} {1 2}
do_test join6-2.1 {
execsql {
DROP TABLE t1;
DROP TABLE t2;
DROP TABLE t3;
CREATE TABLE t1(x,y);
CREATE TABLE t2(y,z);
CREATE TABLE t3(x,z);
INSERT INTO t1 VALUES(1,2);
INSERT INTO t1 VALUES(3,4);
INSERT INTO t2 VALUES(2,3);
INSERT INTO t2 VALUES(4,5);
INSERT INTO t3 VALUES(1,3);
INSERT INTO t3 VALUES(3,5);
SELECT * FROM t1 JOIN t2 USING (y) JOIN t3 USING(x);
}
} {1 2 3 3 3 4 5 5}
do_test join6-2.2 {
execsql {
SELECT * FROM t1 NATURAL JOIN t2 NATURAL JOIN t3;
}
} {1 2 3 3 4 5}
do_test join6-3.1 {
execsql {
DROP TABLE t1;
DROP TABLE t2;
DROP TABLE t3;
CREATE TABLE t1(a,x,y);
INSERT INTO t1 VALUES(1,91,92);
INSERT INTO t1 VALUES(2,93,94);
CREATE TABLE t2(b,y,z);
INSERT INTO t2 VALUES(3,92,93);
INSERT INTO t2 VALUES(4,94,95);
CREATE TABLE t3(c,x,z);
INSERT INTO t3 VALUES(5,91,93);
INSERT INTO t3 VALUES(6,99,95);
SELECT * FROM t1 NATURAL JOIN t2 NATURAL JOIN t3;
}
} {1 91 92 3 93 5}
do_test join6-3.2 {
execsql {
SELECT * FROM t1 JOIN t2 NATURAL JOIN t3;
}
} {1 91 92 3 92 93 5}
do_test join6-3.3 {
execsql {
SELECT * FROM t1 JOIN t2 USING(y) NATURAL JOIN t3;
}
} {1 91 92 3 93 5}
do_test join6-3.4 {
execsql {
SELECT * FROM t1 NATURAL JOIN t2 JOIN t3 USING(x,z);
}
} {1 91 92 3 93 5}
do_test join6-3.5 {
execsql {
SELECT * FROM t1 NATURAL JOIN t2 JOIN t3 USING(x);
}
} {1 91 92 3 93 5 93}
do_test join6-3.6 {
execsql {
SELECT * FROM t1 NATURAL JOIN t2 JOIN t3 USING(z);
}
} {1 91 92 3 93 5 91 2 93 94 4 95 6 99}
do_test join6-4.1 {
execsql {
SELECT * FROM
(SELECT 1 AS a, 91 AS x, 92 AS y UNION SELECT 2, 93, 94)
NATURAL JOIN t2 NATURAL JOIN t3
}
} {1 91 92 3 93 5}
do_test join6-4.2 {
execsql {
SELECT * FROM t1 NATURAL JOIN
(SELECT 3 AS b, 92 AS y, 93 AS z UNION SELECT 4, 94, 95)
NATURAL JOIN t3
}
} {1 91 92 3 93 5}
do_test join6-4.3 {
execsql {
SELECT * FROM t1 NATURAL JOIN t2 NATURAL JOIN
(SELECT 5 AS c, 91 AS x, 93 AS z UNION SELECT 6, 99, 95)
}
} {1 91 92 3 93 5}
finish_test