# 2010 September 20
#
# 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_update.html document are correct.
#
set testdir [file dirname $argv0]
source $testdir/tester.tcl

#--------------------
# Test organization:
#
#   e_update-1.*: Test statements describing the workings of UPDATE statements.
#
#   e_update-2.*: Test the restrictions on the UPDATE statement syntax that
#                 can be used within triggers.
#
#   e_update-3.*: Test the special LIMIT/OFFSET and ORDER BY clauses that can
#                 be used with UPDATE when SQLite is compiled with
#                 SQLITE_ENABLE_UPDATE_DELETE_LIMIT.
#

forcedelete test.db2

do_execsql_test e_update-0.0 {
  ATTACH 'test.db2' AS aux;
  CREATE TABLE t1(a, b);
  CREATE TABLE t2(a, b, c);
  CREATE TABLE t3(a, b UNIQUE);
  CREATE TABLE t6(x, y);
  CREATE INDEX i1 ON t1(a);

  CREATE TEMP TABLE t4(x, y);
  CREATE TEMP TABLE t6(x, y);

  CREATE TABLE aux.t1(a, b);
  CREATE TABLE aux.t5(a, b);
} {}

proc do_update_tests {args} {
  uplevel do_select_tests $args
}

# EVIDENCE-OF: R-05685-44205 -- syntax diagram update-stmt
#
do_update_tests e_update-0 {
  1    "UPDATE t1 SET a=10" {}
  2    "UPDATE t1 SET a=10, b=5" {}
  3    "UPDATE t1 SET a=10 WHERE b=5" {}
  4    "UPDATE t1 SET b=5,a=10 WHERE 1" {}
  5    "UPDATE main.t1 SET a=10" {}
  6    "UPDATE main.t1 SET a=10, b=5" {}
  7    "UPDATE main.t1 SET a=10 WHERE b=5" {}
  9    "UPDATE OR ROLLBACK t1 SET a=10" {}
  10   "UPDATE OR ROLLBACK t1 SET a=10, b=5" {}
  11   "UPDATE OR ROLLBACK t1 SET a=10 WHERE b=5" {}
  12   "UPDATE OR ROLLBACK t1 SET b=5,a=10 WHERE 1" {}
  13   "UPDATE OR ROLLBACK main.t1 SET a=10" {}
  14   "UPDATE OR ROLLBACK main.t1 SET a=10, b=5" {}
  15   "UPDATE OR ROLLBACK main.t1 SET a=10 WHERE b=5" {}
  16   "UPDATE OR ROLLBACK main.t1 SET b=5,a=10 WHERE 1" {}
  17   "UPDATE OR ABORT t1 SET a=10" {}
  18   "UPDATE OR ABORT t1 SET a=10, b=5" {}
  19   "UPDATE OR ABORT t1 SET a=10 WHERE b=5" {}
  20   "UPDATE OR ABORT t1 SET b=5,a=10 WHERE 1" {}
  21   "UPDATE OR ABORT main.t1 SET a=10" {}
  22   "UPDATE OR ABORT main.t1 SET a=10, b=5" {}
  23   "UPDATE OR ABORT main.t1 SET a=10 WHERE b=5" {}
  24   "UPDATE OR ABORT main.t1 SET b=5,a=10 WHERE 1" {}
  25   "UPDATE OR REPLACE t1 SET a=10" {}
  26   "UPDATE OR REPLACE t1 SET a=10, b=5" {}
  27   "UPDATE OR REPLACE t1 SET a=10 WHERE b=5" {}
  28   "UPDATE OR REPLACE t1 SET b=5,a=10 WHERE 1" {}
  29   "UPDATE OR REPLACE main.t1 SET a=10" {}
  30   "UPDATE OR REPLACE main.t1 SET a=10, b=5" {}
  31   "UPDATE OR REPLACE main.t1 SET a=10 WHERE b=5" {}
  32   "UPDATE OR REPLACE main.t1 SET b=5,a=10 WHERE 1" {}
  33   "UPDATE OR FAIL t1 SET a=10" {}
  34   "UPDATE OR FAIL t1 SET a=10, b=5" {}
  35   "UPDATE OR FAIL t1 SET a=10 WHERE b=5" {}
  36   "UPDATE OR FAIL t1 SET b=5,a=10 WHERE 1" {}
  37   "UPDATE OR FAIL main.t1 SET a=10" {}
  38   "UPDATE OR FAIL main.t1 SET a=10, b=5" {}
  39   "UPDATE OR FAIL main.t1 SET a=10 WHERE b=5" {}
  40   "UPDATE OR FAIL main.t1 SET b=5,a=10 WHERE 1" {}
  41   "UPDATE OR IGNORE t1 SET a=10" {}
  42   "UPDATE OR IGNORE t1 SET a=10, b=5" {}
  43   "UPDATE OR IGNORE t1 SET a=10 WHERE b=5" {}
  44   "UPDATE OR IGNORE t1 SET b=5,a=10 WHERE 1" {}
  45   "UPDATE OR IGNORE main.t1 SET a=10" {}
  46   "UPDATE OR IGNORE main.t1 SET a=10, b=5" {}
  47   "UPDATE OR IGNORE main.t1 SET a=10 WHERE b=5" {}
  48   "UPDATE OR IGNORE main.t1 SET b=5,a=10 WHERE 1" {}
}

# EVIDENCE-OF: R-38515-45264 An UPDATE statement is used to modify a
# subset of the values stored in zero or more rows of the database table
# identified by the qualified-table-name specified as part of the UPDATE
# statement.
#
#     Test cases e_update-1.1.1.* test the "identified by the
#     qualified-table-name" part of the statement above. Tests 
#     e_update-1.1.2.* show that the "zero or more rows" part is 
#     accurate.
#
do_execsql_test e_update-1.1.0 {
  INSERT INTO main.t1 VALUES(1, 'i');
  INSERT INTO main.t1 VALUES(2, 'ii');
  INSERT INTO main.t1 VALUES(3, 'iii');

  INSERT INTO aux.t1 VALUES(1, 'I');
  INSERT INTO aux.t1 VALUES(2, 'II');
  INSERT INTO aux.t1 VALUES(3, 'III');
} {}
do_update_tests e_update-1.1 {
  1.1  "UPDATE t1 SET a = a+1; SELECT * FROM t1"             {2 i  3 ii  4 iii}
  1.2  "UPDATE main.t1 SET a = a+1; SELECT * FROM main.t1"   {3 i  4 ii  5 iii}
  1.3  "UPDATE aux.t1 SET a = a+1; SELECT * FROM aux.t1"     {2 I  3 II  4 III}

  2.1  "UPDATE t1 SET a = a+1 WHERE a = 1; SELECT * FROM t1" {3 i  4 ii  5 iii}
  2.2  "UPDATE t1 SET a = a+1 WHERE a = 4; SELECT * FROM t1" {3 i  5 ii  5 iii}
}

# EVIDENCE-OF: R-55869-30521 If the UPDATE statement does not have a
# WHERE clause, all rows in the table are modified by the UPDATE.
#
do_execsql_test e_update-1.2.0 {
  DELETE FROM main.t1;
  INSERT INTO main.t1 VALUES(1, 'i');
  INSERT INTO main.t1 VALUES(2, 'ii');
  INSERT INTO main.t1 VALUES(3, 'iii');
} {}
do_update_tests e_update-1.2 {
  1  "UPDATE t1 SET b = 'roman' ; SELECT * FROM t1"
     {1 roman  2 roman  3 roman}

  2  "UPDATE t1 SET a = 'greek' ; SELECT * FROM t1"
     {greek roman  greek roman  greek roman}
}

# EVIDENCE-OF: R-42117-40023 Otherwise, the UPDATE affects only those
# rows for which the result of evaluating the WHERE clause expression as
# a boolean expression is true.
#
do_execsql_test e_update-1.3.0 {
  DELETE FROM main.t1;
  INSERT INTO main.t1 VALUES(NULL, '');
  INSERT INTO main.t1 VALUES(1, 'i');
  INSERT INTO main.t1 VALUES(2, 'ii');
  INSERT INTO main.t1 VALUES(3, 'iii');
} {}
do_update_tests e_update-1.3 {
  1  "UPDATE t1 SET b = 'roman' WHERE a<2 ; SELECT * FROM t1"
     {{} {}  1 roman  2 ii  3 iii}

  2  "UPDATE t1 SET b = 'egyptian' WHERE (a-3)/10.0 ; SELECT * FROM t1"
     {{} {}  1 egyptian  2 egyptian  3 iii}

  3  "UPDATE t1 SET b = 'macedonian' WHERE a; SELECT * FROM t1"
     {{} {}  1 macedonian  2 macedonian  3 macedonian}

  4  "UPDATE t1 SET b = 'lithuanian' WHERE a IS NULL; SELECT * FROM t1"
     {{} lithuanian  1 macedonian  2 macedonian  3 macedonian}
}

# EVIDENCE-OF: R-58129-20729 It is not an error if the WHERE clause does
# not evaluate to true for any row in the table - this just means that
# the UPDATE statement affects zero rows.
#
do_execsql_test e_update-1.4.0 {
  DELETE FROM main.t1;
  INSERT INTO main.t1 VALUES(NULL, '');
  INSERT INTO main.t1 VALUES(1, 'i');
  INSERT INTO main.t1 VALUES(2, 'ii');
  INSERT INTO main.t1 VALUES(3, 'iii');
} {}
do_update_tests e_update-1.4 -query {
  SELECT * FROM t1
} {
  1  "UPDATE t1 SET b = 'burmese' WHERE a=5" {{} {}  1 i  2 ii  3 iii}

  2  "UPDATE t1 SET b = 'burmese' WHERE length(b)<1 AND a IS NOT NULL"
     {{} {}  1 i  2 ii  3 iii}

  3  "UPDATE t1 SET b = 'burmese' WHERE 0" {{} {}  1 i  2 ii  3 iii}

  4  "UPDATE t1 SET b = 'burmese' WHERE (SELECT a FROM t1 WHERE rowid=1)"
     {{} {}  1 i  2 ii  3 iii}
}

# EVIDENCE-OF: R-40598-36595 For each affected row, the named columns
# are set to the values found by evaluating the corresponding scalar
# expressions.
#
# EVIDENCE-OF: R-40472-60438 Columns that do not appear in the list of
# assignments are left unmodified.
#
do_execsql_test e_update-1.5.0 {
  INSERT INTO t2(rowid, a, b, c) VALUES(1,  3, 1, 4);
  INSERT INTO t2(rowid, a, b, c) VALUES(2,  1, 5, 9);
  INSERT INTO t2(rowid, a, b, c) VALUES(3,  2, 6, 5);
} {}
do_update_tests e_update-1.5 -query {
  SELECT * FROM t2
} {
  1   "UPDATE t2 SET c = 1+1 WHERE a=2" 
      {3 1 4   1 5 9   2 6 2}

  2   "UPDATE t2 SET b = 4/2, c=CAST((0.4*5) AS INTEGER) WHERE a<3"
      {3 1 4   1 2 2   2 2 2}

  3   "UPDATE t2 SET a = 1"
      {1 1 4   1 2 2   1 2 2}

  4   "UPDATE t2 SET b = (SELECT count(*)+2 FROM t2), c = 24/3+1 WHERE rowid=2"
      {1 1 4   1 5 9   1 2 2}

  5   "UPDATE t2 SET a = 3 WHERE c = 4"
      {3 1 4   1 5 9   1 2 2}

  6   "UPDATE t2 SET a = b WHERE rowid>2"
      {3 1 4   1 5 9   2 2 2}

  6   "UPDATE t2 SET b=6, c=5 WHERE a=b AND b=c"
      {3 1 4   1 5 9   2 6 5}
}

# EVIDENCE-OF: R-09060-20018 If a single column-name appears more than
# once in the list of assignment expressions, all but the rightmost
# occurence is ignored.
#
do_update_tests e_update-1.6 -query {
  SELECT * FROM t2
} {
  1   "UPDATE t2 SET c=5, c=6, c=7 WHERE rowid=1" {3 1 7   1 5 9   2 6 5}
  2   "UPDATE t2 SET c=7, c=6, c=5 WHERE rowid=1" {3 1 5   1 5 9   2 6 5}
  3   "UPDATE t2 SET c=5, b=6, c=7 WHERE rowid=1" {3 6 7   1 5 9   2 6 5}
}

# EVIDENCE-OF: R-36239-04077 The scalar expressions may refer to columns
# of the row being updated.
#
# EVIDENCE-OF: R-04558-24451 In this case all scalar expressions are
# evaluated before any assignments are made.
#
do_execsql_test e_update-1.7.0 {
  DELETE FROM t2;
  INSERT INTO t2(rowid, a, b, c) VALUES(1,  3, 1, 4);
  INSERT INTO t2(rowid, a, b, c) VALUES(2,  1, 5, 9);
  INSERT INTO t2(rowid, a, b, c) VALUES(3,  2, 6, 5);
} {}
do_update_tests e_update-1.7 -query {
  SELECT * FROM t2
} {
  1   "UPDATE t2 SET a=b+c"          {5 1 4     14 5 9   11  6 5}
  2   "UPDATE t2 SET a=b, b=a"       {1 5 4     5 14 9    6 11 5}
  3   "UPDATE t2 SET a=c||c, c=NULL" {44 5 {}  99 14 {}  55 11 {}}
}

# EVIDENCE-OF: R-12619-24112 The optional conflict-clause allows the
# user to nominate a specific constraint conflict resolution algorithm
# to use during this one UPDATE command.
#
do_execsql_test e_update-1.8.0 {
  DELETE FROM t3;
  INSERT INTO t3 VALUES(1, 'one');
  INSERT INTO t3 VALUES(2, 'two');
  INSERT INTO t3 VALUES(3, 'three');
  INSERT INTO t3 VALUES(4, 'four');
} {}
foreach {tn sql error ac data } {
  1  "UPDATE t3 SET b='one' WHERE a=3" 
     {column b is not unique} 1 {1 one 2 two 3 three 4 four}

  2  "UPDATE OR REPLACE t3 SET b='one' WHERE a=3" 
     {} 1 {2 two 3 one 4 four}

  3  "UPDATE OR FAIL t3 SET b='three'"
     {column b is not unique} 1 {2 three 3 one 4 four}

  4  "UPDATE OR IGNORE t3 SET b='three' WHERE a=3" 
     {} 1 {2 three 3 one 4 four}

  5  "UPDATE OR ABORT t3 SET b='three' WHERE a=3" 
     {column b is not unique} 1 {2 three 3 one 4 four}

  6  "BEGIN" {} 0 {2 three 3 one 4 four}

  7  "UPDATE t3 SET b='three' WHERE a=3" 
     {column b is not unique} 0 {2 three 3 one 4 four}

  8  "UPDATE OR ABORT t3 SET b='three' WHERE a=3" 
     {column b is not unique} 0 {2 three 3 one 4 four}

  9  "UPDATE OR FAIL t3 SET b='two'"
     {column b is not unique} 0 {2 two 3 one 4 four}

  10 "UPDATE OR IGNORE t3 SET b='four' WHERE a=3"
     {} 0 {2 two 3 one 4 four}

  11 "UPDATE OR REPLACE t3 SET b='four' WHERE a=3"
     {} 0 {2 two 3 four}

  12 "UPDATE OR ROLLBACK t3 SET b='four'"
     {column b is not unique} 1 {2 three 3 one 4 four}
} {
  do_catchsql_test e_update-1.8.$tn.1 $sql [list [expr {$error!=""}] $error]
  do_execsql_test  e_update-1.8.$tn.2 {SELECT * FROM t3} [list {*}$data]
  do_test          e_update-1.8.$tn.3 {sqlite3_get_autocommit db} $ac
}


# EVIDENCE-OF: R-12123-54095 The table-name specified as part of an
# UPDATE statement within a trigger body must be unqualified.
#
# EVIDENCE-OF: R-09690-36749 In other words, the database-name. prefix
# on the table name of the UPDATE is not allowed within triggers.
#
do_update_tests e_update-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
        UPDATE main.t2 SET a=1, b=2, c=3;
      END;
  } {}

  2 {
      CREATE TRIGGER tr1 BEFORE UPDATE ON t2 BEGIN
        UPDATE aux.t1 SET a=1, b=2;
      END;
  } {}

  3 {
      CREATE TRIGGER tr1 AFTER DELETE ON t4 BEGIN
        UPDATE main.t1 SET a=1, b=2;
      END;
  } {}
}

# EVIDENCE-OF: R-06085-13761 Unless the table to which the trigger is
# attached is in the TEMP database, the table being updated by the
# trigger program must reside in the same database as it.
#
do_update_tests e_update-2.2 -error {
  no such table: %s
} {
  1 {
      CREATE TRIGGER tr1 AFTER INSERT ON t1 BEGIN
        UPDATE t4 SET x=x+1;
      END;
      INSERT INTO t1 VALUES(1, 2);
  } "main.t4"

  2 {
      CREATE TRIGGER aux.tr1 AFTER INSERT ON t5 BEGIN
        UPDATE t4 SET x=x+1;
      END;
      INSERT INTO t5 VALUES(1, 2);
  } "aux.t4"
}
do_execsql_test e_update-2.2.X {
  DROP TRIGGER tr1;
  DROP TRIGGER aux.tr1;
} {}

# EVIDENCE-OF: R-29512-54644 If the table to which the trigger is
# attached is in the TEMP database, then the unqualified name of the
# table being updated 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_update-2.3.0 {
  SELECT 'main', tbl_name FROM main.sqlite_master WHERE type = 'table'
    UNION ALL
  SELECT 'temp', tbl_name FROM sqlite_temp_master WHERE type = 'table'
    UNION ALL
  SELECT 'aux', tbl_name FROM aux.sqlite_master WHERE type = 'table'
} [list {*}{
    main t1
    main t2
    main t3
    main t6
    temp t4
    temp t6
    aux  t1
    aux  t5
}]
do_execsql_test e_update-2.3.1 {
  DELETE FROM main.t6;
  DELETE FROM temp.t6;
  INSERT INTO main.t6 VALUES(1, 2);
  INSERT INTO temp.t6 VALUES(1, 2);

  CREATE TRIGGER temp.tr1 AFTER INSERT ON t4 BEGIN
    UPDATE t6 SET x=x+1;
  END;

  INSERT INTO t4 VALUES(1, 2);
  SELECT * FROM main.t6;
  SELECT * FROM temp.t6;
} {1 2 2 2}
do_execsql_test e_update-2.3.2 {
  DELETE FROM main.t1;
  DELETE FROM aux.t1;
  INSERT INTO main.t1 VALUES(1, 2);
  INSERT INTO aux.t1 VALUES(1, 2);

  CREATE TRIGGER temp.tr2 AFTER DELETE ON t4 BEGIN
    UPDATE t1 SET a=a+1;
  END;

  DELETE FROM t4;
  SELECT * FROM main.t1;
  SELECT * FROM aux.t1;
} {2 2 1 2}
do_execsql_test e_update-2.3.3 {
  DELETE FROM aux.t5;
  INSERT INTO aux.t5 VALUES(1, 2);

  INSERT INTO t4 VALUES('x', 'y');
  CREATE TRIGGER temp.tr3 AFTER UPDATE ON t4 BEGIN
    UPDATE t5 SET a=a+1;
  END;

  UPDATE t4 SET x=10;
  SELECT * FROM aux.t5;
} {2 2}

# EVIDENCE-OF: R-19619-42762 The INDEXED BY and NOT INDEXED clauses are
# not allowed on UPDATE statements within triggers.
#
do_update_tests e_update-2.4 -error {
  the %s %s clause is not allowed on UPDATE or DELETE statements within triggers
} {
  1 {
      CREATE TRIGGER tr1 AFTER INSERT ON t2 BEGIN
        UPDATE t1 INDEXED BY i1 SET a=a+1;
      END;
  } {INDEXED BY}

  2 {
      CREATE TRIGGER tr1 AFTER INSERT ON t2 BEGIN
        UPDATE t1 NOT INDEXED SET a=a+1;
      END;
  } {NOT INDEXED}
}

ifcapable update_delete_limit {

# EVIDENCE-OF: R-57359-59558 The LIMIT and ORDER BY clauses for UPDATE
# are unsupported within triggers, regardless of the compilation options
# used to build SQLite.
#
do_update_tests e_update-2.5 -error {
  near "%s": syntax error
} {
  1 {
      CREATE TRIGGER tr1 AFTER INSERT ON t2 BEGIN
        UPDATE t1 SET a=a+1 LIMIT 10;
      END;
  } {LIMIT}

  2 {
      CREATE TRIGGER tr1 AFTER INSERT ON t2 BEGIN
        UPDATE t1 SET a=a+1 ORDER BY a LIMIT 10;
      END;
  } {ORDER}

  3 {
      CREATE TRIGGER tr1 AFTER INSERT ON t2 BEGIN
        UPDATE t1 SET a=a+1 ORDER BY a LIMIT 10 OFFSET 2;
      END;
  } {ORDER}

  4 {
      CREATE TRIGGER tr1 AFTER INSERT ON t2 BEGIN
        UPDATE t1 SET a=a+1 LIMIT 10 OFFSET 2;
      END;
  } {LIMIT}
}

# EVIDENCE-OF: R-59581-44104 If SQLite is built with the
# SQLITE_ENABLE_UPDATE_DELETE_LIMIT compile-time option then the syntax
# of the UPDATE statement is extended with optional ORDER BY and LIMIT
# clauses
#
# EVIDENCE-OF: R-08948-01887 -- syntax diagram update-stmt-limited
#
do_update_tests e_update-3.0 {
  1   "UPDATE t1 SET a=b LIMIT 5"                                    {}
  2   "UPDATE t1 SET a=b LIMIT 5-1 OFFSET 2+2"                       {}
  3   "UPDATE t1 SET a=b LIMIT 2+2, 16/4"                            {}
  4   "UPDATE t1 SET a=b ORDER BY a LIMIT 5"                         {}
  5   "UPDATE t1 SET a=b ORDER BY a LIMIT 5-1 OFFSET 2+2"            {}
  6   "UPDATE t1 SET a=b ORDER BY a LIMIT 2+2, 16/4"                 {}
  7   "UPDATE t1 SET a=b WHERE a>2 LIMIT 5"                          {}
  8   "UPDATE t1 SET a=b WHERE a>2 LIMIT 5-1 OFFSET 2+2"             {}
  9   "UPDATE t1 SET a=b WHERE a>2 LIMIT 2+2, 16/4"                  {}
  10  "UPDATE t1 SET a=b WHERE a>2 ORDER BY a LIMIT 5"               {}
  11  "UPDATE t1 SET a=b WHERE a>2 ORDER BY a LIMIT 5-1 OFFSET 2+2"  {}
  12  "UPDATE t1 SET a=b WHERE a>2 ORDER BY a LIMIT 2+2, 16/4"       {}
}

do_execsql_test e_update-3.1.0 {
  CREATE TABLE t7(q, r, s);
  INSERT INTO t7 VALUES(1, 'one',   'X');
  INSERT INTO t7 VALUES(2, 'two',   'X');
  INSERT INTO t7 VALUES(3, 'three', 'X');
  INSERT INTO t7 VALUES(4, 'four',  'X');
  INSERT INTO t7 VALUES(5, 'five',  'X');
  INSERT INTO t7 VALUES(6, 'six',   'X');
  INSERT INTO t7 VALUES(7, 'seven', 'X');
  INSERT INTO t7 VALUES(8, 'eight', 'X');
  INSERT INTO t7 VALUES(9, 'nine',  'X');
  INSERT INTO t7 VALUES(10, 'ten',  'X');
} {}

# EVIDENCE-OF: R-58862-44169 If an UPDATE statement has a LIMIT clause,
# the maximum number of rows that will be updated is found by evaluating
# the accompanying expression and casting it to an integer value.
#
do_update_tests e_update-3.1 -query { SELECT s FROM t7 } {
  1   "UPDATE t7 SET s = q LIMIT 5"            {1 2 3 4 5 X X X X X}
  2   "UPDATE t7 SET s = r WHERE q>2 LIMIT 4"  {1 2 three four five six X X X X}
  3   "UPDATE t7 SET s = q LIMIT 0"            {1 2 three four five six X X X X}
}

# EVIDENCE-OF: R-63582-45120 A negative value is interpreted as "no limit".
#
do_update_tests e_update-3.2 -query { SELECT s FROM t7 } {
  1   "UPDATE t7 SET s = q LIMIT -1"              {1 2 3 4 5 6 7 8 9 10}
  2   "UPDATE t7 SET s = r WHERE q>4 LIMIT -1"  
      {1 2 3 4 five six seven eight nine ten}
  3   "UPDATE t7 SET s = 'X' LIMIT -1"            {X X X X X X X X X X}
}

# EVIDENCE-OF: R-18628-11938 If the LIMIT expression evaluates to
# non-negative value N and the UPDATE statement has an ORDER BY clause,
# then all rows that would be updated in the absence of the LIMIT clause
# are sorted according to the ORDER BY and the first N updated.
#
do_update_tests e_update-3.3 -query { SELECT s FROM t7 } {
  1   "UPDATE t7 SET s = q ORDER BY r LIMIT 3"      {X X X 4 5 X X 8 X X}
  2   "UPDATE t7 SET s = r ORDER BY r DESC LIMIT 2" {X two three 4 5 X X 8 X X}
  3   "UPDATE t7 SET s = q ORDER BY q DESC LIMIT 5" {X two three 4 5 6 7 8 9 10}

  X   "UPDATE t7 SET s = 'X'"                       {X X X X X X X X X X}
}

# EVIDENCE-OF: R-30955-38324 If the UPDATE statement also has an OFFSET
# clause, then it is similarly evaluated and cast to an integer value.
# If the OFFSET expression evaluates to a non-negative value M, then the
# first M rows are skipped and the following N rows updated instead.
#
do_update_tests e_update-3.3 -query { SELECT s FROM t7 } {
  1   "UPDATE t7 SET s = q ORDER BY q LIMIT 3 OFFSET 2"  {X X 3 4 5 X X X X X}
  2   "UPDATE t7 SET s = q ORDER BY q DESC LIMIT 2, 3 "  {X X 3 4 5 6 7 8 X X}

  X   "UPDATE t7 SET s = 'X'"                       {X X X X X X X X X X}
}

# EVIDENCE-OF: R-19486-35828 If the UPDATE statement has no ORDER BY
# clause, then all rows that would be updated in the absence of the
# LIMIT clause are assembled in an arbitrary order before applying the
# LIMIT and OFFSET clauses to determine which are actually updated.
#
#     In practice, "arbitrary order" is rowid order. This is also tested
#     by e_update-3.2.* above.
#
do_update_tests e_update-3.4 -query { SELECT s FROM t7 } {
  1   "UPDATE t7 SET s = q LIMIT 4, 2"        {X X X X 5 6 X X X X}
  2   "UPDATE t7 SET s = q LIMIT 2 OFFSET 7"  {X X X X 5 6 X 8 9 X}
}

# EVIDENCE-OF: R-10927-26133 The ORDER BY clause on an UPDATE statement
# is used only to determine which rows fall within the LIMIT. The order
# in which rows are modified is arbitrary and is not influenced by the
# ORDER BY clause.
#
do_execsql_test e_update-3.5.0 {
  CREATE TABLE t8(x);
  CREATE TRIGGER tr7 BEFORE UPDATE ON t7 BEGIN
    INSERT INTO t8 VALUES(old.q);
  END;
} {}
do_update_tests e_update-3.5 -query { SELECT x FROM t8 ; DELETE FROM t8 } {
  1   "UPDATE t7 SET s = q ORDER BY r LIMIT -1"        {1 2 3 4 5 6 7 8 9 10}
  2   "UPDATE t7 SET s = q ORDER BY r ASC LIMIT -1"    {1 2 3 4 5 6 7 8 9 10}
  3   "UPDATE t7 SET s = q ORDER BY r DESC LIMIT -1"   {1 2 3 4 5 6 7 8 9 10}
  4   "UPDATE t7 SET s = q ORDER BY q DESC LIMIT 5"    {6 7 8 9 10}
}


} ;# ifcapable update_delete_limit
 
finish_test