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-# 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 SELECT statements that are part of
-# expressions.
-#
-# $Id: subselect.test,v 1.16 2008/08/04 03:51:24 danielk1977 Exp $
-
-set testdir [file dirname $argv0]
-source $testdir/tester.tcl
-
-# Omit this whole file if the library is build without subquery support.
-ifcapable !subquery {
-  finish_test
-  return
-}
-
-# Basic sanity checking.  Try a simple subselect.
-#
-do_test subselect-1.1 {
-  execsql {
-    CREATE TABLE t1(a int, b int);
-    INSERT INTO t1 VALUES(1,2);
-    INSERT INTO t1 VALUES(3,4);
-    INSERT INTO t1 VALUES(5,6);
-  }
-  execsql {SELECT * FROM t1 WHERE a = (SELECT count(*) FROM t1)}
-} {3 4}
-
-# Try a select with more than one result column.
-#
-do_test subselect-1.2 {
-  set v [catch {execsql {SELECT * FROM t1 WHERE a = (SELECT * FROM t1)}} msg]
-  lappend v $msg
-} {1 {only a single result allowed for a SELECT that is part of an expression}}
-
-# A subselect without an aggregate.
-#
-do_test subselect-1.3a {
-  execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=2)}
-} {2}
-do_test subselect-1.3b {
-  execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=4)}
-} {4}
-do_test subselect-1.3c {
-  execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=6)}
-} {6}
-do_test subselect-1.3d {
-  execsql {SELECT b from t1 where a = (SELECT a FROM t1 WHERE b=8)}
-} {}
-ifcapable compound {
-  do_test subselect-1.3e {
-    execsql {
-      SELECT b FROM t1
-       WHERE a = (SELECT a FROM t1 UNION SELECT b FROM t1 ORDER BY 1);
-    }
-  } {2}
-}
-
-# What if the subselect doesn't return any value.  We should get
-# NULL as the result.  Check it out.
-#
-do_test subselect-1.4 {
-  execsql {SELECT b from t1 where a = coalesce((SELECT a FROM t1 WHERE b=5),1)}
-} {2}
-
-# Try multiple subselects within a single expression.
-#
-do_test subselect-1.5 {
-  execsql {
-    CREATE TABLE t2(x int, y int);
-    INSERT INTO t2 VALUES(1,2);
-    INSERT INTO t2 VALUES(2,4);
-    INSERT INTO t2 VALUES(3,8);
-    INSERT INTO t2 VALUES(4,16);
-  }
-  execsql {
-    SELECT y from t2 
-    WHERE x = (SELECT sum(b) FROM t1 where a notnull) - (SELECT sum(a) FROM t1)
-  }
-} {8}
-
-# Try something useful.  Delete every entry from t2 where the
-# x value is less than half of the maximum.
-#
-do_test subselect-1.6 {
-  execsql {DELETE FROM t2 WHERE x < 0.5*(SELECT max(x) FROM t2)}
-  execsql {SELECT x FROM t2 ORDER BY x}
-} {2 3 4}
-
-# Make sure sorting works for SELECTs there used as a scalar expression.
-#
-do_test subselect-2.1 {
-  execsql {
-    SELECT (SELECT a FROM t1 ORDER BY a), (SELECT a FROM t1 ORDER BY a DESC)
-  }
-} {1 5}
-do_test subselect-2.2 {
-  execsql {
-    SELECT 1 IN (SELECT a FROM t1 ORDER BY a);
-  }
-} {1}
-do_test subselect-2.3 {
-  execsql {
-    SELECT 2 IN (SELECT a FROM t1 ORDER BY a DESC);
-  }
-} {0}
-
-# Verify that the ORDER BY clause is honored in a subquery.
-#
-ifcapable compound {
-do_test subselect-3.1 {
-  execsql {
-    CREATE TABLE t3(x int);
-    INSERT INTO t3 SELECT a FROM t1 UNION ALL SELECT b FROM t1;
-    SELECT * FROM t3 ORDER BY x;
-  }
-} {1 2 3 4 5 6}
-} ;# ifcapable compound
-ifcapable !compound {
-do_test subselect-3.1 {
-  execsql {
-    CREATE TABLE t3(x int);
-    INSERT INTO t3 SELECT a FROM t1; 
-    INSERT INTO t3 SELECT b FROM t1;
-    SELECT * FROM t3 ORDER BY x;
-  }
-} {1 2 3 4 5 6}
-} ;# ifcapable !compound
-
-do_test subselect-3.2 {
-  execsql {
-    SELECT sum(x) FROM (SELECT x FROM t3 ORDER BY x LIMIT 2);
-  }
-} {3}
-do_test subselect-3.3 {
-  execsql {
-    SELECT sum(x) FROM (SELECT x FROM t3 ORDER BY x DESC LIMIT 2);
-  }
-} {11}
-do_test subselect-3.4 {
-  execsql {
-    SELECT (SELECT x FROM t3 ORDER BY x);
-  }
-} {1}
-do_test subselect-3.5 {
-  execsql {
-    SELECT (SELECT x FROM t3 ORDER BY x DESC);
-  }
-} {6}
-do_test subselect-3.6 {
-  execsql {
-    SELECT (SELECT x FROM t3 ORDER BY x LIMIT 1);
-  }
-} {1}
-do_test subselect-3.7 {
-  execsql {
-    SELECT (SELECT x FROM t3 ORDER BY x DESC LIMIT 1);
-  }
-} {6}
-do_test subselect-3.8 {
-  execsql {
-    SELECT (SELECT x FROM t3 ORDER BY x LIMIT 1 OFFSET 2);
-  }
-} {3}
-do_test subselect-3.9 {
-  execsql {
-    SELECT (SELECT x FROM t3 ORDER BY x DESC LIMIT 1 OFFSET 2);
-  }
-} {4}
-do_test subselect-3.10 {
-  execsql {
-    SELECT x FROM t3 WHERE x IN
-       (SELECT x FROM t3 ORDER BY x DESC LIMIT 1 OFFSET 2);
-  }
-} {4}
-
-# Ticket #2295.
-# Make sure type affinities work correctly on subqueries with
-# an ORDER BY clause.
-#
-do_test subselect-4.1 {
-  execsql {
-    CREATE TABLE t4(a TEXT, b TEXT);
-    INSERT INTO t4 VALUES('a','1');
-    INSERT INTO t4 VALUES('b','2');
-    INSERT INTO t4 VALUES('c','3');
-    SELECT a FROM t4 WHERE b IN (SELECT b FROM t4 ORDER BY b);
-  }
-} {a b c}
-do_test subselect-4.2 {
-  execsql {
-    SELECT a FROM t4 WHERE b IN (SELECT b FROM t4 ORDER BY b LIMIT 1);
-  }
-} {a}
-do_test subselect-4.3 {
-  execsql {
-    SELECT a FROM t4 WHERE b IN (SELECT b FROM t4 ORDER BY b DESC LIMIT 1);
-  }
-} {c}
-
-finish_test