SQLite

# 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