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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 {row value misused}}
+
+# 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