test/where.test

# 2001 September 15
#
# 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 the use of indices in WHERE clases.
#
# $Id: where.test,v 1.3 2001/09/16 00:13:28 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 1}
do_test where-1.2 {
  execsql {SELECT x, y, fcnt(*) FROM t1 WHERE w=11}
} {3 144 1}
do_test where-1.3 {
  execsql {SELECT x, y, fcnt(*) FROM t1 WHERE 11=w}
} {3 144 1}
do_test where-1.4 {
  execsql {SELECT x, y, fcnt(*) FROM t1 WHERE 11=w AND x>2}
} {3 144 1}
do_test where-1.5 {
  execsql {SELECT x, y, fcnt(*) FROM t1 WHERE y<200 AND w=11 AND x>2}
} {3 144 1}
do_test where-1.6 {
  execsql {SELECT x, y, fcnt(*) FROM t1 WHERE y<200 AND x>2 AND w=11}
} {3 144 1}
do_test where-1.7 {
  execsql {SELECT x, y, fcnt(*) FROM t1 WHERE w=11 AND y<200 AND x>2}
} {3 144 1}
do_test where-1.8 {
  execsql {SELECT x, y, fcnt(*) FROM t1 WHERE w>10 AND y=144 AND x=3}
} {3 144 1}
do_test where-1.9 {
  execsql {SELECT x, y, fcnt(*) FROM t1 WHERE y=144 AND w>10 AND x=3}
} {3 144 1}
do_test where-1.10 {
  execsql {SELECT x, y, fcnt(*) FROM t1 WHERE x=3 AND w>=10 AND y=121}
} {3 121 1}
do_test where-1.11 {
  execsql {SELECT x, y, fcnt(*) FROM t1 WHERE x=3 AND y=100 AND w<10}
} {3 100 1}

# 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 2}
do_test where-2.2 {
  execsql {
    SELECT w, p, fcnt(*) FROM t2, t1
    WHERE x=q AND s=y AND r=8977
  }
} {34 67 2}
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 2}
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 2}
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 2}
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 2}
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 2}

# 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 3}
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 3}
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 3}

finish_test