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

Artifact eb3a46b3eaf38e25e3013433b2db8a25a866c215:


# 2013-09-05
#
# 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.
#
#***********************************************************************
# 
# Test cases for query planning decisions and the unlikely() and
# likelihood() functions.

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

do_execsql_test whereG-1.0 {
  CREATE TABLE composer(
    cid INTEGER PRIMARY KEY,
    cname TEXT
  );
  CREATE TABLE album(
    aid INTEGER PRIMARY KEY,
    aname TEXT
  );
  CREATE TABLE track(
    tid INTEGER PRIMARY KEY,
    cid INTEGER REFERENCES composer,
    aid INTEGER REFERENCES album,
    title TEXT
  );
  CREATE INDEX track_i1 ON track(cid);
  CREATE INDEX track_i2 ON track(aid);
  INSERT INTO composer VALUES(1, 'W. A. Mozart');
  INSERT INTO composer VALUES(2, 'Beethoven');
  INSERT INTO composer VALUES(3, 'Thomas Tallis');
  INSERT INTO composer VALUES(4, 'Joseph Hayden');
  INSERT INTO composer VALUES(5, 'Thomas Weelkes');
  INSERT INTO composer VALUES(6, 'J. S. Bach');
  INSERT INTO composer VALUES(7, 'Orlando Gibbons');
  INSERT INTO composer VALUES(8, 'Josquin des Prés');
  INSERT INTO composer VALUES(9, 'Byrd');
  INSERT INTO composer VALUES(10, 'Francis Poulenc');
  INSERT INTO composer VALUES(11, 'Mendelsshon');
  INSERT INTO composer VALUES(12, 'Zoltán Kodály');
  INSERT INTO composer VALUES(13, 'Handel');
  INSERT INTO album VALUES(100, 'Kodály: Missa Brevis');
  INSERT INTO album VALUES(101, 'Messiah');
  INSERT INTO album VALUES(102, 'Missa Brevis in D-, K.65');
  INSERT INTO album VALUES(103, 'The complete English anthems');
  INSERT INTO album VALUES(104, 'Mass in B Minor, BWV 232');
  INSERT INTO track VALUES(10005, 12, 100, 'Sanctus');
  INSERT INTO track VALUES(10007, 12, 100, 'Agnus Dei');
  INSERT INTO track VALUES(10115, 13, 101, 'Surely He Hath Borne Our Griefs');
  INSERT INTO track VALUES(10129, 13, 101, 'Since By Man Came Death');
  INSERT INTO track VALUES(10206, 1, 102, 'Agnus Dei');
  INSERT INTO track VALUES(10301, 3, 103, 'If Ye Love Me');
  INSERT INTO track VALUES(10402, 6, 104, 'Domine Deus');
  INSERT INTO track VALUES(10403, 6, 104, 'Qui tollis');
} {}
do_eqp_test whereG-1.1 {
  SELECT DISTINCT aname
    FROM album, composer, track
   WHERE unlikely(cname LIKE '%bach%')
     AND composer.cid=track.cid
     AND album.aid=track.aid;
} {/.*composer.*track.*album.*/}
do_execsql_test whereG-1.2 {
  SELECT DISTINCT aname
    FROM album, composer, track
   WHERE unlikely(cname LIKE '%bach%')
     AND composer.cid=track.cid
     AND album.aid=track.aid;
} {{Mass in B Minor, BWV 232}}

do_eqp_test whereG-1.3 {
  SELECT DISTINCT aname
    FROM album, composer, track
   WHERE likelihood(cname LIKE '%bach%', 0.5)
     AND composer.cid=track.cid
     AND album.aid=track.aid;
} {/.*track.*composer.*album.*/}
do_execsql_test whereG-1.4 {
  SELECT DISTINCT aname
    FROM album, composer, track
   WHERE likelihood(cname LIKE '%bach%', 0.5)
     AND composer.cid=track.cid
     AND album.aid=track.aid;
} {{Mass in B Minor, BWV 232}}

do_eqp_test whereG-1.5 {
  SELECT DISTINCT aname
    FROM album, composer, track
   WHERE cname LIKE '%bach%'
     AND composer.cid=track.cid
     AND album.aid=track.aid;
} {/.*track.*(composer.*album|album.*composer).*/}
do_execsql_test whereG-1.6 {
  SELECT DISTINCT aname
    FROM album, composer, track
   WHERE cname LIKE '%bach%'
     AND composer.cid=track.cid
     AND album.aid=track.aid;
} {{Mass in B Minor, BWV 232}}

do_eqp_test whereG-1.7 {
  SELECT DISTINCT aname
    FROM album, composer, track
   WHERE cname LIKE '%bach%'
     AND unlikely(composer.cid=track.cid)
     AND unlikely(album.aid=track.aid);
} {/.*track.*(composer.*album|album.*composer).*/}
do_execsql_test whereG-1.8 {
  SELECT DISTINCT aname
    FROM album, composer, track
   WHERE cname LIKE '%bach%'
     AND unlikely(composer.cid=track.cid)
     AND unlikely(album.aid=track.aid);
} {{Mass in B Minor, BWV 232}}

do_test whereG-2.1 {
  catchsql {
    SELECT DISTINCT aname
      FROM album, composer, track
     WHERE likelihood(cname LIKE '%bach%', -0.01)
       AND composer.cid=track.cid
       AND album.aid=track.aid;
  }
} {1 {second argument to likelihood() must be a constant between 0.0 and 1.0}}
do_test whereG-2.2 {
  catchsql {
    SELECT DISTINCT aname
      FROM album, composer, track
     WHERE likelihood(cname LIKE '%bach%', 1.01)
       AND composer.cid=track.cid
       AND album.aid=track.aid;
  }
} {1 {second argument to likelihood() must be a constant between 0.0 and 1.0}}
do_test whereG-2.3 {
  catchsql {
    SELECT DISTINCT aname
      FROM album, composer, track
     WHERE likelihood(cname LIKE '%bach%', track.cid)
       AND composer.cid=track.cid
       AND album.aid=track.aid;
  }
} {1 {second argument to likelihood() must be a constant between 0.0 and 1.0}}

# Commuting a term of the WHERE clause should not change the query plan
#
do_execsql_test whereG-3.0 {
  CREATE TABLE a(a1 PRIMARY KEY, a2);
  CREATE TABLE b(b1 PRIMARY KEY, b2);
} {}
do_eqp_test whereG-3.1 {
  SELECT * FROM a, b WHERE b1=a1 AND a2=5;
} {/.*SCAN TABLE a.*SEARCH TABLE b USING INDEX .*b_1 .b1=..*/}
do_eqp_test whereG-3.2 {
  SELECT * FROM a, b WHERE a1=b1 AND a2=5;
} {/.*SCAN TABLE a.*SEARCH TABLE b USING INDEX .*b_1 .b1=..*/}
do_eqp_test whereG-3.3 {
  SELECT * FROM a, b WHERE a2=5 AND b1=a1;
} {/.*SCAN TABLE a.*SEARCH TABLE b USING INDEX .*b_1 .b1=..*/}
do_eqp_test whereG-3.4 {
  SELECT * FROM a, b WHERE a2=5 AND a1=b1;
} {/.*SCAN TABLE a.*SEARCH TABLE b USING INDEX .*b_1 .b1=..*/}


finish_test