# 2005 September 19

 #

 # 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 left outer joins containing ON

 # clauses that restrict the scope of the left term of the join.

 #

 # $Id: join5.test,v 1.2 2007/06/08 00:20:48 drh Exp $

 set testdir [file dirname $argv0]

 source $testdir/tester.tcl

 do_test join5-1.1 {

   execsql {

     BEGIN;

     CREATE TABLE t1(a integer primary key, b integer, c integer);

     CREATE TABLE t2(x integer primary key, y);

     CREATE TABLE t3(p integer primary key, q);

     INSERT INTO t3 VALUES(11,'t3-11');

     INSERT INTO t3 VALUES(12,'t3-12');

     INSERT INTO t2 VALUES(11,'t2-11');

     INSERT INTO t2 VALUES(12,'t2-12');

     INSERT INTO t1 VALUES(1, 5, 0);

     INSERT INTO t1 VALUES(2, 11, 2);

     INSERT INTO t1 VALUES(3, 12, 1);

     COMMIT;

   }

 } {}

 do_test join5-1.2 {

   execsql {

     select * from t1 left join t2 on t1.b=t2.x and t1.c=1

   }

 } {1 5 0 {} {} 2 11 2 {} {} 3 12 1 12 t2-12}

 do_test join5-1.3 {

   execsql {

     select * from t1 left join t2 on t1.b=t2.x where t1.c=1

   }

 } {3 12 1 12 t2-12}

 do_test join5-1.4 {

   execsql {

     select * from t1 left join t2 on t1.b=t2.x and t1.c=1

                      left join t3 on t1.b=t3.p and t1.c=2

   }

 } {1 5 0 {} {} {} {} 2 11 2 {} {} 11 t3-11 3 12 1 12 t2-12 {} {}}

 do_test join5-1.5 {

   execsql {

     select * from t1 left join t2 on t1.b=t2.x and t1.c=1

                      left join t3 on t1.b=t3.p where t1.c=2

   }

 } {2 11 2 {} {} 11 t3-11}

 # Ticket #2403

 #

 do_test join5-2.1 {

   execsql {

     CREATE TABLE ab(a,b);

     INSERT INTO "ab" VALUES(1,2);

     INSERT INTO "ab" VALUES(3,NULL);

     CREATE TABLE xy(x,y);

     INSERT INTO "xy" VALUES(2,3);

     INSERT INTO "xy" VALUES(NULL,1);

   }

   execsql {SELECT * FROM xy LEFT JOIN ab ON 0}

 } {2 3 {} {} {} 1 {} {}}

 do_test join5-2.2 {

   execsql {SELECT * FROM xy LEFT JOIN ab ON 1}

 } {2 3 1 2 2 3 3 {} {} 1 1 2 {} 1 3 {}}

 do_test join5-2.3 {

   execsql {SELECT * FROM xy LEFT JOIN ab ON NULL}

 } {2 3 {} {} {} 1 {} {}}

 do_test join5-2.4 {

   execsql {SELECT * FROM xy LEFT JOIN ab ON 0 WHERE 0}

 } {}

 do_test join5-2.5 {

   execsql {SELECT * FROM xy LEFT JOIN ab ON 1 WHERE 0}

 } {}

 do_test join5-2.6 {

   execsql {SELECT * FROM xy LEFT JOIN ab ON NULL WHERE 0}

 } {}

 do_test join5-2.7 {

   execsql {SELECT * FROM xy LEFT JOIN ab ON 0 WHERE 1}

 } {2 3 {} {} {} 1 {} {}}

 do_test join5-2.8 {

   execsql {SELECT * FROM xy LEFT JOIN ab ON 1 WHERE 1}

 } {2 3 1 2 2 3 3 {} {} 1 1 2 {} 1 3 {}}

 do_test join5-2.9 {

   execsql {SELECT * FROM xy LEFT JOIN ab ON NULL WHERE 1}

 } {2 3 {} {} {} 1 {} {}}

 do_test join5-2.10 {

   execsql {SELECT * FROM xy LEFT JOIN ab ON 0 WHERE NULL}

 } {}

 do_test join5-2.11 {

   execsql {SELECT * FROM xy LEFT JOIN ab ON 1 WHERE NULL}

 } {}

 do_test join5-2.12 {

   execsql {SELECT * FROM xy LEFT JOIN ab ON NULL WHERE NULL}

 } {}

 finish_test