SQLite

# Copyright (c) 1999, 2000 D. Richard Hipp
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
# 
# You should have received a copy of the GNU General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA  02111-1307, USA.
#
# Author contact information:
#   drh@hwaci.com
#   http://www.hwaci.com/drh/
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is testing the use of indices in WHERE clases.
#
# $Id: where.test,v 1.1 2000/06/12 12:20:49 drh Exp $

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

# Build some test data
#
do_test where-1.0 {
  execsql {
    CREATE TABLE t1(w int, x int, y int);
    CREATE TABLE t2(p int, q int, r int, s int);
  }
  for {set i 1} {$i<=100} {incr i} {
    set w $i
    set x [expr {int(log($i)/log(2))}]
    set y [expr {$i*$i + 2*$i + 1}]
    execsql "INSERT INTO t1 VALUES($w,$x,$y)"
  }
  execsql {
    INSERT INTO t2 SELECT 101-w, x, (SELECT max(y) FROM t1)+1-y, y FROM t1;
    CREATE INDEX i1w ON t1(w);
    CREATE INDEX i1xy ON t1(x,y);
    CREATE INDEX i2p ON t2(p);
    CREATE INDEX i2r ON t2(r);
    CREATE INDEX i2qs ON t2(q, s);
  }
} {}

# Verify that queries use an index.  We are using the special "fcnt(*)"
# function to verify the results.  fcnt(*) returns the number of Fetch
# operations that have occurred up to the point where fcnt(*) is invoked.
# By verifing that fcnt(*) returns a small number we know that an index
# was used instead of an exhaustive search.
#
do_test where-1.1 {
  execsql {SELECT x, y, fcnt(*) FROM t1 WHERE w=10}
} {3 121 2}
do_test where-1.2 {
  execsql {SELECT x, y, fcnt(*) FROM t1 WHERE w=11}
} {3 144 2}
do_test where-1.3 {
  execsql {SELECT x, y, fcnt(*) FROM t1 WHERE 11=w}
} {3 144 2}
do_test where-1.4 {
  execsql {SELECT x, y, fcnt(*) FROM t1 WHERE 11=w AND x>2}
} {3 144 2}
do_test where-1.5 {
  execsql {SELECT x, y, fcnt(*) FROM t1 WHERE y<200 AND w=11 AND x>2}
} {3 144 2}
do_test where-1.6 {
  execsql {SELECT x, y, fcnt(*) FROM t1 WHERE y<200 AND x>2 AND w=11}
} {3 144 2}
do_test where-1.7 {
  execsql {SELECT x, y, fcnt(*) FROM t1 WHERE w=11 AND y<200 AND x>2}
} {3 144 2}
do_test where-1.8 {
  execsql {SELECT x, y, fcnt(*) FROM t1 WHERE w>10 AND y=144 AND x=3}
} {3 144 2}
do_test where-1.9 {
  execsql {SELECT x, y, fcnt(*) FROM t1 WHERE y=144 AND w>10 AND x=3}
} {3 144 2}
do_test where-1.10 {
  execsql {SELECT x, y, fcnt(*) FROM t1 WHERE x=3 AND w>=10 AND y=121}
} {3 121 2}
do_test where-1.11 {
  execsql {SELECT x, y, fcnt(*) FROM t1 WHERE x=3 AND y=100 AND w<10}
} {3 100 2}

# Do the same kind of thing except use a join as the data source.
#
do_test where-2.1 {
  execsql {
    SELECT w, p, fcnt(*) FROM t2, t1
    WHERE x=q AND y=s AND r=8977
  }
} {34 67 4}
do_test where-2.2 {
  execsql {
    SELECT w, p, fcnt(*) FROM t2, t1
    WHERE x=q AND s=y AND r=8977
  }
} {34 67 4}
do_test where-2.3 {
  execsql {
    SELECT w, p, fcnt(*) FROM t2, t1
    WHERE x=q AND s=y AND r=8977 AND w>10
  }
} {34 67 4}
do_test where-2.4 {
  execsql {
    SELECT w, p, fcnt(*) FROM t2, t1
    WHERE p<80 AND x=q AND s=y AND r=8977 AND w>10
  }
} {34 67 4}
do_test where-2.5 {
  execsql {
    SELECT w, p, fcnt(*) FROM t2, t1
    WHERE p<80 AND x=q AND 8977=r AND s=y AND w>10
  }
} {34 67 4}
do_test where-2.6 {
  execsql {
    SELECT w, p, fcnt(*) FROM t2, t1
    WHERE x=q AND p=77 AND s=y AND w>5
  }
} {24 77 4}
do_test where-2.7 {
  execsql {
    SELECT w, p, fcnt(*) FROM t1, t2
    WHERE x=q AND p>77 AND s=y AND w=5
  }
} {5 96 4}

# Lets do a 3-way join.
#
do_test where-3.1 {
  execsql {
    SELECT A.w, B.p, C.w, fcnt(*) FROM t1 as A, t2 as B, t1 as C
    WHERE C.w=101-B.p AND B.r=10202-A.y AND A.w=11
  }
} {11 90 11 6}
do_test where-3.2 {
  execsql {
    SELECT A.w, B.p, C.w, fcnt(*) FROM t1 as A, t2 as B, t1 as C
    WHERE C.w=101-B.p AND B.r=10202-A.y AND A.w=12
  }
} {12 89 12 6}
do_test where-3.3 {
  execsql {
    SELECT A.w, B.p, C.w, fcnt(*) FROM t1 as A, t2 as B, t1 as C
    WHERE A.w=15 AND B.p=C.w AND B.r=10202-A.y
  }
} {15 86 86 6}

finish_test

}


proc chng {date desc} {
  puts "<DT><B>$date</B></DT>"
  puts "<DD><P><UL>$desc</UL></P></DD>"
}

chng {2000 June 11} {
<li>Added a <b>fcnt()</b> function which is designed to help write better.
    test scripts.  This function is not useful for anything other than
    testing and debugging, as far as I know.</li>
}

chng {2000 June 8} {
<li>Added lots of new test cases</li>
<li>Fix a few bugs discovered while adding test cases</li>
<li>Begin adding lots of new documentation</li>
}