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

Artifact acc710c12af118df5f8645eaba9479f5619eed81:


# 2012 September 18
#
# 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.
#
#***********************************************************************
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix in5

do_test in5-1.1 {
  execsql {
    CREATE TABLE t1x(x INTEGER PRIMARY KEY);
    INSERT INTO t1x VALUES(1),(3),(5),(7),(9);
    CREATE TABLE t1y(y INTEGER UNIQUE);
    INSERT INTO t1y VALUES(2),(4),(6),(8);
    CREATE TABLE t1z(z TEXT UNIQUE);
    INSERT INTO t1z VALUES('a'),('c'),('e'),('g');
    CREATE TABLE t2(a INTEGER, b INTEGER, c TEXT, d TEXT);
    INSERT INTO t2 VALUES(1,2,'a','12a'),(1,2,'b','12b'),
                         (2,3,'g','23g'),(3,5,'c','35c'),
                         (4,6,'h','46h'),(5,6,'e','56e');
    CREATE TABLE t3x AS SELECT x FROM t1x;
    CREATE TABLE t3y AS SELECT y FROM t1y;
    CREATE TABLE t3z AS SELECT z FROM t1z;
    SELECT d FROM t2 WHERE a IN t1x AND b IN t1y AND c IN t1z ORDER BY c;
  }
} {12a 56e}
do_test in5-1.2 {
  execsql {
    SELECT d FROM t2 WHERE a IN t1y AND b IN t1x AND c IN t1z ORDER BY d;
  }
} {23g}
do_test in5-1.3 {
  execsql {
    SELECT d FROM t2 WHERE a IN t3x AND b IN t3y AND c IN t3z ORDER BY d;
  }
} {12a 56e}


do_test in5-2.1 {
  execsql {
    CREATE INDEX t2abc ON t2(a,b,c);
    SELECT d FROM t2 WHERE a IN t1x AND b IN t1y AND c IN t1z ORDER BY d;
  }
} {12a 56e}
do_test in5-2.2 {
  execsql {
    SELECT d FROM t2 WHERE a IN t1y AND b IN t1x AND c IN t1z ORDER BY d;
  }
} {23g}
do_test in5-2.3 {
  regexp {OpenEphemeral} [db eval {
    EXPLAIN SELECT d FROM t2 WHERE a IN t1x AND b IN t1y AND c IN t1z
  }]
} {0}
do_test in5-2.4 {
  execsql {
    SELECT d FROM t2 WHERE a IN t3x AND b IN t3y AND c IN t3z ORDER BY d;
  }
} {12a 56e}
do_test in5-2.5.1 {
  regexp {OpenEphemeral} [db eval {
    EXPLAIN SELECT d FROM t2 WHERE a IN t3x AND b IN t1y AND c IN t1z
  }]
} {1}
do_test in5-2.5.2 {
  regexp {OpenEphemeral} [db eval {
    EXPLAIN SELECT d FROM t2 WHERE a IN t1x AND b IN t3y AND c IN t1z
  }]
} {1}
do_test in5-2.5.3 {
  regexp {OpenEphemeral} [db eval {
    EXPLAIN SELECT d FROM t2 WHERE a IN t1x AND b IN t1y AND c IN t3z
  }]
} {1}

do_test in5-3.1 {
  execsql {
    DROP INDEX t2abc;
    CREATE INDEX t2ab ON t2(a,b);
    SELECT d FROM t2 WHERE a IN t1x AND b IN t1y AND c IN t1z ORDER BY d;
  }
} {12a 56e}
do_test in5-3.2 {
  execsql {
    SELECT d FROM t2 WHERE a IN t1y AND b IN t1x AND c IN t1z ORDER BY d;
  }
} {23g}
do_test in5-3.3 {
  regexp {OpenEphemeral} [db eval {
    EXPLAIN SELECT d FROM t2 WHERE a IN t1x AND b IN t1y AND c IN t1z
  }]
} {0}

do_test in5-4.1 {
  execsql {
    DROP INDEX t2ab;
    CREATE INDEX t2abcd ON t2(a,b,c,d);
    SELECT d FROM t2 WHERE a IN t1x AND b IN t1y AND c IN t1z ORDER BY d;
  }
} {12a 56e}
do_test in5-4.2 {
  execsql {
    SELECT d FROM t2 WHERE a IN t1y AND b IN t1x AND c IN t1z ORDER BY d;
  }
} {23g}
do_test in5-4.3 {
  regexp {OpenEphemeral} [db eval {
    EXPLAIN SELECT d FROM t2 WHERE a IN t1x AND b IN t1y AND c IN t1z
  }]
} {0}


do_test in5-5.1 {
  execsql {
    DROP INDEX t2abcd;
    CREATE INDEX t2cbad ON t2(c,b,a,d);
    SELECT d FROM t2 WHERE a IN t1x AND b IN t1y AND c IN t1z ORDER BY d;
  }
} {12a 56e}
do_test in5-5.2 {
  execsql {
    SELECT d FROM t2 WHERE a IN t1y AND b IN t1x AND c IN t1z ORDER BY d;
  }
} {23g}
do_test in5-5.3 {
  regexp {OpenEphemeral} [db eval {
    EXPLAIN SELECT d FROM t2 WHERE a IN t1x AND b IN t1y AND c IN t1z
  }]
} {0}

#-------------------------------------------------------------------------
# At one point SQLite was removing the DISTINCT keyword from expressions
# similar to:
#
#   <expr1> IN (SELECT DISTINCT <expr2> FROM...)
#
# However, there are a few obscure cases where this is incorrect. For
# example, if the SELECT features a LIMIT clause, or if the collation
# sequence or affinity used by the DISTINCT does not match the one used
# by the IN(...) expression.
#
do_execsql_test 6.1.1 {
  CREATE TABLE t1(a COLLATE nocase);
  INSERT INTO t1 VALUES('one');
  INSERT INTO t1 VALUES('ONE');
}
do_execsql_test 6.1.2 {
  SELECT count(*) FROM t1 WHERE a COLLATE BINARY IN (SELECT DISTINCT a FROM t1)
} {1}

do_execsql_test 6.2.1 {
  CREATE TABLE t3(a, b);
  INSERT INTO t3 VALUES(1, 1);
  INSERT INTO t3 VALUES(1, 2);
  INSERT INTO t3 VALUES(1, 3);
  INSERT INTO t3 VALUES(2, 4);
  INSERT INTO t3 VALUES(2, 5);
  INSERT INTO t3 VALUES(2, 6);
  INSERT INTO t3 VALUES(3, 7);
  INSERT INTO t3 VALUES(3, 8);
  INSERT INTO t3 VALUES(3, 9);
}
do_execsql_test 6.2.2 {
  SELECT count(*) FROM t3 WHERE b IN (SELECT DISTINCT a FROM t3 LIMIT 5);
} {3}
do_execsql_test 6.2.3 {
  SELECT count(*) FROM t3 WHERE b IN (SELECT          a FROM t3 LIMIT 5);
} {2}

do_execsql_test 6.3.1 {
  CREATE TABLE x1(a);
  CREATE TABLE x2(b);
  INSERT INTO x1 VALUES(1), (1), (2);
  INSERT INTO x2 VALUES(1), (2);
  SELECT count(*) FROM x2 WHERE b IN (SELECT DISTINCT a FROM x1 LIMIT 2);
} {2}

#-------------------------------------------------------------------------
# Test to confirm that bug [5e3c886796e5] is fixed.
#
do_execsql_test 7.1 {
  CREATE TABLE y1(a, b);
  CREATE TABLE y2(c);

  INSERT INTO y1 VALUES(1,     'one');
  INSERT INTO y1 VALUES('two', 'two');
  INSERT INTO y1 VALUES(3,     'three');

  INSERT INTO y2 VALUES('one');
  INSERT INTO y2 VALUES('two');
  INSERT INTO y2 VALUES('three');
} {}

do_execsql_test 7.2.1 {
  SELECT a FROM y1 WHERE b NOT IN (SELECT a FROM y2);
} {1 3}
do_execsql_test 7.2.2 {
  SELECT a FROM y1 WHERE b IN (SELECT a FROM y2);
} {two}

do_execsql_test 7.3.1 {
  CREATE INDEX y2c ON y2(c);
  SELECT a FROM y1 WHERE b NOT IN (SELECT a FROM y2);
} {1 3}
do_execsql_test 7.3.2 {
  SELECT a FROM y1 WHERE b IN (SELECT a FROM y2);
} {two}

finish_test



finish_test