join5.test

sqlite-3.4.1,嵌入式数据库.是一个功能强大的开源数据库,给学习和研发以及小型公司的发展带来了全所未有的好处.

# 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