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+# 2010 September 21
+#
+# 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 tests to verify that the "testable statements" in 
+# the lang_delete.html document are correct.
+#
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+proc do_delete_tests {args} {
+  uplevel do_select_tests $args
+}
+
+do_execsql_test e_delete-0.0 {
+  CREATE TABLE t1(a, b);
+  CREATE INDEX i1 ON t1(a);
+} {}
+
+# EVIDENCE-OF: R-24177-52883 -- syntax diagram delete-stmt
+#
+# EVIDENCE-OF: R-12802-60464 -- syntax diagram qualified-table-name
+#
+do_delete_tests e_delete-0.1 {
+  1  "DELETE FROM t1"                              {}
+  2  "DELETE FROM t1 INDEXED BY i1"                {}
+  3  "DELETE FROM t1 NOT INDEXED"                  {}
+  4  "DELETE FROM main.t1"                         {}
+  5  "DELETE FROM main.t1 INDEXED BY i1"           {}
+  6  "DELETE FROM main.t1 NOT INDEXED"             {}
+  7  "DELETE FROM t1 WHERE a>2"                    {}
+  8  "DELETE FROM t1 INDEXED BY i1 WHERE a>2"      {}
+  9  "DELETE FROM t1 NOT INDEXED WHERE a>2"        {}
+  10 "DELETE FROM main.t1 WHERE a>2"               {}
+  11 "DELETE FROM main.t1 INDEXED BY i1 WHERE a>2" {}
+  12 "DELETE FROM main.t1 NOT INDEXED WHERE a>2"   {}
+}
+
+# EVIDENCE-OF: R-20205-17349 If the WHERE clause is not present, all
+# records in the table are deleted.
+#
+drop_all_tables
+do_test e_delete-1.0 {
+  db transaction {
+    foreach t {t1 t2 t3 t4 t5 t6} {
+      execsql [string map [list %T% $t] {
+        CREATE TABLE %T%(x, y);
+        INSERT INTO %T% VALUES(1, 'one');
+        INSERT INTO %T% VALUES(2, 'two');
+        INSERT INTO %T% VALUES(3, 'three');
+        INSERT INTO %T% VALUES(4, 'four');
+        INSERT INTO %T% VALUES(5, 'five');
+      }]
+    }
+  }
+} {}
+do_delete_tests e_delete-1.1 {
+  1  "DELETE FROM t1       ; SELECT * FROM t1"       {}
+  2  "DELETE FROM main.t2  ; SELECT * FROM t2"       {}
+}
+
+# EVIDENCE-OF: R-30203-16177 If a WHERE clause is supplied, then only
+# those rows for which the result of evaluating the WHERE clause as a
+# boolean expression is true are deleted.
+#
+do_delete_tests e_delete-1.2 {
+  1  "DELETE FROM t3 WHERE 1       ; SELECT x FROM t3"       {}
+  2  "DELETE FROM main.t4 WHERE 0  ; SELECT x FROM t4"       {1 2 3 4 5}
+  3  "DELETE FROM t4 WHERE 0.0     ; SELECT x FROM t4"       {1 2 3 4 5}
+  4  "DELETE FROM t4 WHERE NULL    ; SELECT x FROM t4"       {1 2 3 4 5}
+  5  "DELETE FROM t4 WHERE y!='two'; SELECT x FROM t4"       {2}
+  6  "DELETE FROM t4 WHERE y='two' ; SELECT x FROM t4"       {}
+  7  "DELETE FROM t5 WHERE x=(SELECT max(x) FROM t5);SELECT x FROM t5" {1 2 3 4}
+  8  "DELETE FROM t5 WHERE (SELECT max(x) FROM t4)  ;SELECT x FROM t5" {1 2 3 4}
+  9  "DELETE FROM t5 WHERE (SELECT max(x) FROM t6)  ;SELECT x FROM t5" {}
+  10 "DELETE FROM t6 WHERE y>'seven' ; SELECT y FROM t6"     {one four five}
+}
+
+
+#-------------------------------------------------------------------------
+# Tests for restrictions on DELETE statements that appear within trigger
+# programs.
+#
+forcedelete test.db2
+forcedelete test.db3
+do_execsql_test e_delete-2.0 {
+  ATTACH 'test.db2' AS aux;
+  ATTACH 'test.db3' AS aux2;
+
+  CREATE TABLE temp.t7(a, b);   INSERT INTO temp.t7 VALUES(1, 2);
+  CREATE TABLE main.t7(a, b);   INSERT INTO main.t7 VALUES(3, 4);
+  CREATE TABLE aux.t7(a, b);    INSERT INTO aux.t7 VALUES(5, 6);
+  CREATE TABLE aux2.t7(a, b);   INSERT INTO aux2.t7 VALUES(7, 8);
+
+  CREATE TABLE main.t8(a, b);   INSERT INTO main.t8 VALUES(1, 2);
+  CREATE TABLE aux.t8(a, b);    INSERT INTO aux.t8 VALUES(3, 4);
+  CREATE TABLE aux2.t8(a, b);   INSERT INTO aux2.t8 VALUES(5, 6);
+
+  CREATE TABLE aux.t9(a, b);    INSERT INTO aux.t9 VALUES(1, 2);
+  CREATE TABLE aux2.t9(a, b);   INSERT INTO aux2.t9 VALUES(3, 4);
+
+  CREATE TABLE aux2.t10(a, b);  INSERT INTO aux2.t10 VALUES(1, 2);
+} {}
+
+
+# EVIDENCE-OF: R-09681-58560 The table-name specified as part of a
+# DELETE statement within a trigger body must be unqualified.
+#
+# EVIDENCE-OF: R-36771-43788 In other words, the database-name. prefix
+# on the table name is not allowed within triggers.
+#
+do_delete_tests e_delete-2.1 -error {
+  qualified table names are not allowed on INSERT, UPDATE, and DELETE statements within triggers
+} {
+  1 {
+      CREATE TRIGGER tr1 AFTER INSERT ON t1 BEGIN
+        DELETE FROM main.t2;
+      END;
+  } {}
+
+  2 {
+      CREATE TRIGGER tr1 BEFORE UPDATE ON t2 BEGIN
+        DELETE FROM temp.t7 WHERE a=new.a;
+      END;
+  } {}
+
+  3 {
+      CREATE TRIGGER tr1 AFTER UPDATE ON t8 BEGIN
+        DELETE FROM aux2.t8 WHERE b!=a;
+      END;
+  } {}
+}
+
+# EVIDENCE-OF: R-28818-63526 If the table to which the trigger is
+# attached is not in the temp database, then DELETE statements within
+# the trigger body must operate on tables within the same database as
+# it.
+# 
+#   This is tested in two parts. First, check that if a table of the
+#   specified name does not exist, an error is raised. Secondly, test
+#   that if tables with the specified name exist in multiple databases,
+#   the local database table is used.
+#
+do_delete_tests e_delete-2.2.1 -error { no such table: %s } {
+  1 {
+      CREATE TRIGGER main.tr1 AFTER INSERT ON main.t7 BEGIN
+        DELETE FROM t9;
+      END;
+      INSERT INTO main.t7 VALUES(1, 2);
+  } {main.t9}
+
+  2 {
+      CREATE TRIGGER aux.tr2 BEFORE UPDATE ON t9 BEGIN
+        DELETE FROM t10;
+      END;
+      UPDATE t9 SET a=1;
+  } {aux.t10}
+}
+do_execsql_test e_delete-2.2.X {
+  DROP TRIGGER main.tr1;
+  DROP TRIGGER aux.tr2;
+} {}
+
+do_delete_tests e_delete-2.2.2 {
+  1 {
+      CREATE TRIGGER aux.tr1 AFTER INSERT ON t8 BEGIN
+        DELETE FROM t9;
+      END;
+      INSERT INTO aux.t8 VALUES(1, 2);
+
+      SELECT count(*) FROM aux.t9 
+        UNION ALL
+      SELECT count(*) FROM aux2.t9;
+  } {0 1}
+
+  2 {
+      CREATE TRIGGER main.tr1 AFTER INSERT ON t8 BEGIN
+        DELETE FROM t7;
+      END;
+      INSERT INTO main.t8 VALUES(1, 2);
+
+      SELECT count(*) FROM temp.t7 
+        UNION ALL
+      SELECT count(*) FROM main.t7
+        UNION ALL
+      SELECT count(*) FROM aux.t7
+        UNION ALL
+      SELECT count(*) FROM aux2.t7;
+  } {1 0 1 1}
+}
+
+# EVIDENCE-OF: R-31567-38587 If the table to which the trigger is
+# attached is in the TEMP database, then the unqualified name of the
+# table being deleted is resolved in the same way as it is for a
+# top-level statement (by searching first the TEMP database, then the
+# main database, then any other databases in the order they were
+# attached).
+#
+do_execsql_test e_delete-2.3.0 {
+  DROP TRIGGER aux.tr1;
+  DROP TRIGGER main.tr1;
+  DELETE FROM main.t8 WHERE oid>1;
+  DELETE FROM aux.t8 WHERE oid>1;
+  INSERT INTO aux.t9 VALUES(1, 2);
+  INSERT INTO main.t7 VALUES(3, 4);
+} {}
+do_execsql_test e_delete-2.3.1 {
+  SELECT count(*) FROM temp.t7 UNION ALL SELECT count(*) FROM main.t7 UNION ALL
+  SELECT count(*) FROM aux.t7  UNION ALL SELECT count(*) FROM aux2.t7;
+
+  SELECT count(*) FROM main.t8 UNION ALL SELECT count(*) FROM aux.t8  
+  UNION ALL SELECT count(*) FROM aux2.t8;
+
+  SELECT count(*) FROM aux.t9  UNION ALL SELECT count(*) FROM aux2.t9;
+
+  SELECT count(*) FROM aux2.t10;
+} {1 1 1 1 1 1 1 1 1 1}
+do_execsql_test e_delete-2.3.2 {
+  CREATE TRIGGER temp.tr1 AFTER INSERT ON t7 BEGIN
+    DELETE FROM t7;
+    DELETE FROM t8;
+    DELETE FROM t9;
+    DELETE FROM t10;
+  END;
+  INSERT INTO temp.t7 VALUES('hello', 'world');
+} {}
+do_execsql_test e_delete-2.3.3 {
+  SELECT count(*) FROM temp.t7 UNION ALL SELECT count(*) FROM main.t7 UNION ALL
+  SELECT count(*) FROM aux.t7  UNION ALL SELECT count(*) FROM aux2.t7;
+
+  SELECT count(*) FROM main.t8 UNION ALL SELECT count(*) FROM aux.t8  
+  UNION ALL SELECT count(*) FROM aux2.t8;
+
+  SELECT count(*) FROM aux.t9  UNION ALL SELECT count(*) FROM aux2.t9;
+
+  SELECT count(*) FROM aux2.t10;
+} {0 1 1 1 0 1 1 0 1 0}
+
+# EVIDENCE-OF: R-28691-49464 The INDEXED BY and NOT INDEXED clauses are
+# not allowed on DELETE statements within triggers.
+#
+do_execsql_test e_delete-2.4.0 {
+  CREATE INDEX i8 ON t8(a, b);
+} {}
+do_delete_tests e_delete-2.4 -error {
+  the %s %s clause is not allowed on UPDATE or DELETE statements within triggers
+} {
+  1 {
+    CREATE TRIGGER tr3 AFTER INSERT ON t8 BEGIN
+      DELETE FROM t8 INDEXED BY i8 WHERE a=5;
+    END;
+  } {INDEXED BY}
+  2 {
+    CREATE TRIGGER tr3 AFTER INSERT ON t8 BEGIN
+      DELETE FROM t8 NOT INDEXED WHERE a=5;
+    END;
+  } {NOT INDEXED}
+}
+
+ifcapable update_delete_limit {
+
+# EVIDENCE-OF: R-64942-06615 The LIMIT and ORDER BY clauses (described
+# below) are unsupported for DELETE statements within triggers.
+#
+do_delete_tests e_delete-2.5 -error { near "%s": syntax error } {
+  1 {
+    CREATE TRIGGER tr3 AFTER INSERT ON t8 BEGIN
+      DELETE FROM t8 LIMIT 10;
+    END;
+  } {LIMIT}
+  2 {
+    CREATE TRIGGER tr3 AFTER INSERT ON t8 BEGIN
+      DELETE FROM t8 ORDER BY a LIMIT 5;
+    END;
+  } {ORDER}
+}
+
+# EVIDENCE-OF: R-40026-10531 If SQLite is compiled with the
+# SQLITE_ENABLE_UPDATE_DELETE_LIMIT compile-time option, then the syntax
+# of the DELETE statement is extended by the addition of optional ORDER
+# BY and LIMIT clauses:
+#
+# EVIDENCE-OF: R-45897-01670 -- syntax diagram delete-stmt-limited
+#
+do_delete_tests e_delete-3.1 {
+  1   "DELETE FROM t1 LIMIT 5"                                    {}
+  2   "DELETE FROM t1 LIMIT 5-1 OFFSET 2+2"                       {}
+  3   "DELETE FROM t1 LIMIT 2+2, 16/4"                            {}
+  4   "DELETE FROM t1 ORDER BY x LIMIT 5"                         {}
+  5   "DELETE FROM t1 ORDER BY x LIMIT 5-1 OFFSET 2+2"            {}
+  6   "DELETE FROM t1 ORDER BY x LIMIT 2+2, 16/4"                 {}
+  7   "DELETE FROM t1 WHERE x>2 LIMIT 5"                          {}
+  8   "DELETE FROM t1 WHERE x>2 LIMIT 5-1 OFFSET 2+2"             {}
+  9   "DELETE FROM t1 WHERE x>2 LIMIT 2+2, 16/4"                  {}
+  10  "DELETE FROM t1 WHERE x>2 ORDER BY x LIMIT 5"               {}
+  11  "DELETE FROM t1 WHERE x>2 ORDER BY x LIMIT 5-1 OFFSET 2+2"  {}
+  12  "DELETE FROM t1 WHERE x>2 ORDER BY x LIMIT 2+2, 16/4"       {}
+}
+
+drop_all_tables
+proc rebuild_t1 {} {
+  catchsql { DROP TABLE t1 }
+  execsql {
+    CREATE TABLE t1(a, b);
+    INSERT INTO t1 VALUES(1, 'one');
+    INSERT INTO t1 VALUES(2, 'two');
+    INSERT INTO t1 VALUES(3, 'three');
+    INSERT INTO t1 VALUES(4, 'four');
+    INSERT INTO t1 VALUES(5, 'five');
+  }
+}
+
+# EVIDENCE-OF: R-44062-08550 If a DELETE statement has a LIMIT clause,
+# the maximum number of rows that will be deleted is found by evaluating
+# the accompanying expression and casting it to an integer value.
+#
+rebuild_t1
+do_delete_tests e_delete-3.2 -repair rebuild_t1 -query {
+  SELECT a FROM t1
+} {
+  1   "DELETE FROM t1 LIMIT 3"       {4 5}
+  2   "DELETE FROM t1 LIMIT 1+1"     {3 4 5}
+  3   "DELETE FROM t1 LIMIT '4'"     {5}
+  4   "DELETE FROM t1 LIMIT '1.0'"   {2 3 4 5}
+}
+
+# EVIDENCE-OF: R-02661-56399 If the result of the evaluating the LIMIT
+# clause cannot be losslessly converted to an integer value, it is an
+# error.
+#
+do_delete_tests e_delete-3.3 -error { datatype mismatch } {
+  1   "DELETE FROM t1 LIMIT 'abc'"   {}
+  2   "DELETE FROM t1 LIMIT NULL"    {}
+  3   "DELETE FROM t1 LIMIT X'ABCD'" {}
+  4   "DELETE FROM t1 LIMIT 1.2"     {}
+}
+
+# EVIDENCE-OF: R-00598-03741 A negative LIMIT value is interpreted as
+# "no limit".
+#
+do_delete_tests e_delete-3.4 -repair rebuild_t1 -query {
+  SELECT a FROM t1
+} {
+  1   "DELETE FROM t1 LIMIT -1"       {}
+  2   "DELETE FROM t1 LIMIT 2-4"      {}
+  3   "DELETE FROM t1 LIMIT -4.0"     {}
+  4   "DELETE FROM t1 LIMIT 5*-1"     {}
+}
+
+# EVIDENCE-OF: R-26377-49195 If the DELETE statement also has an OFFSET
+# clause, then it is similarly evaluated and cast to an integer value.
+# Again, it is an error if the value cannot be losslessly converted to
+# an integer.
+#
+do_delete_tests e_delete-3.5 -error { datatype mismatch } {
+  1   "DELETE FROM t1 LIMIT 1 OFFSET 'abc'"   {}
+  2   "DELETE FROM t1 LIMIT 1 OFFSET NULL"    {}
+  3   "DELETE FROM t1 LIMIT 1 OFFSET X'ABCD'" {}
+  4   "DELETE FROM t1 LIMIT 1 OFFSET 1.2"     {}
+  5   "DELETE FROM t1 LIMIT 'abc', 1"         {}
+  6   "DELETE FROM t1 LIMIT NULL, 1"          {}
+  7   "DELETE FROM t1 LIMIT X'ABCD', 1"       {}
+  8   "DELETE FROM t1 LIMIT 1.2, 1"           {}
+}
+
+
+# EVIDENCE-OF: R-64004-53814 If there is no OFFSET clause, or the
+# calculated integer value is negative, the effective OFFSET value is
+# zero.
+#
+do_delete_tests e_delete-3.6 -repair rebuild_t1 -query {
+  SELECT a FROM t1
+} {
+  1a  "DELETE FROM t1 LIMIT 3 OFFSET 0"        {4 5}
+  1b  "DELETE FROM t1 LIMIT 3"                 {4 5}
+  1c  "DELETE FROM t1 LIMIT 3 OFFSET -1"       {4 5}
+  2a  "DELETE FROM t1 LIMIT 1+1 OFFSET 0"      {3 4 5}
+  2b  "DELETE FROM t1 LIMIT 1+1"               {3 4 5}
+  2c  "DELETE FROM t1 LIMIT 1+1 OFFSET 2-5"    {3 4 5}
+  3a  "DELETE FROM t1 LIMIT '4' OFFSET 0"      {5}
+  3b  "DELETE FROM t1 LIMIT '4'"               {5}
+  3c  "DELETE FROM t1 LIMIT '4' OFFSET -1.0"   {5}
+  4a  "DELETE FROM t1 LIMIT '1.0' OFFSET 0"    {2 3 4 5}
+  4b  "DELETE FROM t1 LIMIT '1.0'"             {2 3 4 5}
+  4c  "DELETE FROM t1 LIMIT '1.0' OFFSET -11"  {2 3 4 5}
+}
+
+# EVIDENCE-OF: R-48141-52334 If the DELETE statement has an ORDER BY
+# clause, then all rows that would be deleted in the absence of the
+# LIMIT clause are sorted according to the ORDER BY. The first M rows,
+# where M is the value found by evaluating the OFFSET clause expression,
+# are skipped, and the following N, where N is the value of the LIMIT
+# expression, are deleted.
+#
+do_delete_tests e_delete-3.7 -repair rebuild_t1 -query {
+  SELECT a FROM t1
+} {
+  1   "DELETE FROM t1 ORDER BY b LIMIT 2"               {1 2 3}
+  2   "DELETE FROM t1 ORDER BY length(b), a LIMIT 3"    {3 5}
+  3   "DELETE FROM t1 ORDER BY a DESC LIMIT 1 OFFSET 0"  {1 2 3 4}
+  4   "DELETE FROM t1 ORDER BY a DESC LIMIT 1 OFFSET 1"  {1 2 3 5}
+  5   "DELETE FROM t1 ORDER BY a DESC LIMIT 1 OFFSET 2"  {1 2 4 5}
+}
+
+# EVIDENCE-OF: R-64535-08414 If there are less than N rows remaining
+# after taking the OFFSET clause into account, or if the LIMIT clause
+# evaluated to a negative value, then all remaining rows are deleted.
+#
+do_delete_tests e_delete-3.8 -repair rebuild_t1 -query {
+  SELECT a FROM t1
+} {
+  1   "DELETE FROM t1 ORDER BY a ASC LIMIT 10"           {}
+  2   "DELETE FROM t1 ORDER BY a ASC LIMIT -1"           {}
+  3   "DELETE FROM t1 ORDER BY a ASC LIMIT 4 OFFSET 2"   {1 2}
+}
+
+# EVIDENCE-OF: R-37284-06965 If the DELETE statement has no ORDER BY
+# clause, then all rows that would be deleted in the absence of the
+# LIMIT clause are assembled in an arbitrary order before applying the
+# LIMIT and OFFSET clauses to determine the subset that are actually
+# deleted.
+#
+#     In practice, the "arbitrary order" is rowid order.
+#
+do_delete_tests e_delete-3.9 -repair rebuild_t1 -query {
+  SELECT a FROM t1
+} {
+  1   "DELETE FROM t1 LIMIT 2"               {3 4 5}
+  2   "DELETE FROM t1 LIMIT 3"               {4 5}
+  3   "DELETE FROM t1 LIMIT 1 OFFSET 0"      {2 3 4 5}
+  4   "DELETE FROM t1 LIMIT 1 OFFSET 1"      {1 3 4 5}
+  5   "DELETE FROM t1 LIMIT 1 OFFSET 2"      {1 2 4 5}
+}
+
+
+# EVIDENCE-OF: R-07548-13422 The ORDER BY clause on a DELETE statement
+# is used only to determine which rows fall within the LIMIT. The order
+# in which rows are deleted is arbitrary and is not influenced by the
+# ORDER BY clause.
+#
+#     In practice, rows are always deleted in rowid order.
+#
+do_delete_tests e_delete-3.10 -repair {
+  rebuild_t1 
+  catchsql { DROP TABLE t1log }
+  execsql {
+    CREATE TABLE t1log(x);
+    CREATE TRIGGER tr1 AFTER DELETE ON t1 BEGIN
+      INSERT INTO t1log VALUES(old.a);
+    END;
+  }
+} -query {
+  SELECT x FROM t1log
+} {
+  1   "DELETE FROM t1 ORDER BY a DESC LIMIT 2"   {4 5}
+  2   "DELETE FROM t1 ORDER BY a DESC LIMIT -1"  {1 2 3 4 5}
+  3   "DELETE FROM t1 ORDER BY a ASC LIMIT 2"    {1 2}
+  4   "DELETE FROM t1 ORDER BY a ASC LIMIT -1"   {1 2 3 4 5}
+}
+
+}
+ 
+finish_test