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SQLite training in Houston TX on 2019-11-05 (details)
Part of the 2019 Tcl Conference

Artifact fdf66f96d29a064b63eb543e28da4dfdccd81ad2:


# 2007 June 8
#
# 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.  The
# focus of this file is testing NULL comparisons in the WHERE clause.
# See ticket #2404.
#
# $Id: where5.test,v 1.2 2007/06/08 08:43:10 drh Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Build some test data
#
do_test where5-1.0 {
  execsql {
    CREATE TABLE t1(x TEXT);
    CREATE TABLE t2(x INTEGER);
    CREATE TABLE t3(x INTEGER PRIMARY KEY);
    INSERT INTO t1 VALUES(-1);
    INSERT INTO t1 VALUES(0);
    INSERT INTO t1 VALUES(1);
    INSERT INTO t2 SELECT * FROM t1;
    INSERT INTO t3 SELECT * FROM t2;
  }
  execsql {
    SELECT * FROM t1 WHERE x<0
  }
} {-1}
do_test where5-1.1 {
  execsql {
    SELECT * FROM t1 WHERE x<=0
  }
} {-1 0}
do_test where5-1.2 {
  execsql {
    SELECT * FROM t1 WHERE x=0
  }
} {0}
do_test where5-1.3 {
  execsql {
    SELECT * FROM t1 WHERE x>=0
  }
} {0 1}
do_test where5-1.4 {
  execsql {
    SELECT * FROM t1 WHERE x>0
  }
} {1}
do_test where5-1.5 {
  execsql {
    SELECT * FROM t1 WHERE x<>0
  }
} {-1 1}
do_test where5-1.6 {
  execsql {
    SELECT * FROM t1 WHERE x<NULL
  }
} {}
do_test where5-1.7 {
  execsql {
    SELECT * FROM t1 WHERE x<=NULL
  }
} {}
do_test where5-1.8 {
  execsql {
    SELECT * FROM t1 WHERE x=NULL
  }
} {}
do_test where5-1.9 {
  execsql {
    SELECT * FROM t1 WHERE x>=NULL
  }
} {}
do_test where5-1.10 {
  execsql {
    SELECT * FROM t1 WHERE x>NULL
  }
} {}
do_test where5-1.11 {
  execsql {
    SELECT * FROM t1 WHERE x!=NULL
  }
} {}
do_test where5-1.12 {
  execsql {
    SELECT * FROM t1 WHERE x IS NULL
  }
} {}
do_test where5-1.13 {
  execsql {
    SELECT * FROM t1 WHERE x IS NOT NULL
  }
} {-1 0 1}


do_test where5-2.0 {
  execsql {
    SELECT * FROM t2 WHERE x<0
  }
} {-1}
do_test where5-2.1 {
  execsql {
    SELECT * FROM t2 WHERE x<=0
  }
} {-1 0}
do_test where5-2.2 {
  execsql {
    SELECT * FROM t2 WHERE x=0
  }
} {0}
do_test where5-2.3 {
  execsql {
    SELECT * FROM t2 WHERE x>=0
  }
} {0 1}
do_test where5-2.4 {
  execsql {
    SELECT * FROM t2 WHERE x>0
  }
} {1}
do_test where5-2.5 {
  execsql {
    SELECT * FROM t2 WHERE x<>0
  }
} {-1 1}
do_test where5-2.6 {
  execsql {
    SELECT * FROM t2 WHERE x<NULL
  }
} {}
do_test where5-2.7 {
  execsql {
    SELECT * FROM t2 WHERE x<=NULL
  }
} {}
do_test where5-2.8 {
  execsql {
    SELECT * FROM t2 WHERE x=NULL
  }
} {}
do_test where5-2.9 {
  execsql {
    SELECT * FROM t2 WHERE x>=NULL
  }
} {}
do_test where5-2.10 {
  execsql {
    SELECT * FROM t2 WHERE x>NULL
  }
} {}
do_test where5-2.11 {
  execsql {
    SELECT * FROM t2 WHERE x!=NULL
  }
} {}
do_test where5-2.12 {
  execsql {
    SELECT * FROM t2 WHERE x IS NULL
  }
} {}
do_test where5-2.13 {
  execsql {
    SELECT * FROM t2 WHERE x IS NOT NULL
  }
} {-1 0 1}


do_test where5-3.0 {
  execsql {
    SELECT * FROM t3 WHERE x<0
  }
} {-1}
do_test where5-3.1 {
  execsql {
    SELECT * FROM t3 WHERE x<=0
  }
} {-1 0}
do_test where5-3.2 {
  execsql {
    SELECT * FROM t3 WHERE x=0
  }
} {0}
do_test where5-3.3 {
  execsql {
    SELECT * FROM t3 WHERE x>=0
  }
} {0 1}
do_test where5-3.4 {
  execsql {
    SELECT * FROM t3 WHERE x>0
  }
} {1}
do_test where5-3.5 {
  execsql {
    SELECT * FROM t3 WHERE x<>0
  }
} {-1 1}
do_test where5-3.6 {
  execsql {
    SELECT * FROM t3 WHERE x<NULL
  }
} {}
do_test where5-3.7 {
  execsql {
    SELECT * FROM t3 WHERE x<=NULL
  }
} {}
do_test where5-3.8 {
  execsql {
    SELECT * FROM t3 WHERE x=NULL
  }
} {}
do_test where5-3.9 {
  execsql {
    SELECT * FROM t3 WHERE x>=NULL
  }
} {}
do_test where5-3.10 {
  execsql {
    SELECT * FROM t3 WHERE x>NULL
  }
} {}
do_test where5-3.11 {
  execsql {
    SELECT * FROM t3 WHERE x!=NULL
  }
} {}
do_test where5-3.12 {
  execsql {
    SELECT * FROM t3 WHERE x IS NULL
  }
} {}
do_test where5-3.13 {
  execsql {
    SELECT * FROM t3 WHERE x IS NOT NULL
  }
} {-1 0 1}

do_test where5-4.0 {
  execsql {
    SELECT x<NULL FROM t3
  }
} {{} {} {}}
do_test where5-4.1 {
  execsql {
    SELECT x<=NULL FROM t3
  }
} {{} {} {}}
do_test where5-4.2 {
  execsql {
    SELECT x==NULL FROM t3
  }
} {{} {} {}}
do_test where5-4.3 {
  execsql {
    SELECT x>NULL FROM t3
  }
} {{} {} {}}
do_test where5-4.4 {
  execsql {
    SELECT x>=NULL FROM t3
  }
} {{} {} {}}
do_test where5-4.5 {
  execsql {
    SELECT x!=NULL FROM t3
  }
} {{} {} {}}
do_test where5-4.6 {
  execsql {
    SELECT x IS NULL FROM t3
  }
} {0 0 0}
do_test where5-4.7 {
  execsql {
    SELECT x IS NOT NULL FROM t3
  }
} {1 1 1}

finish_test