sqlite/test/altercons3.test

# 2026 July 8
#
# 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 altercons3

# If SQLITE_OMIT_ALTERTABLE is defined, omit this file.
ifcapable !altertable {
  finish_test
  return
}

#-------------------------------------------------------------------------
do_execsql_test 1.0 {
  CREATE TABLE p1(a PRIMARY KEY);
  CREATE TABLE c1(b CONSTRAINT fk REFERENCES p1(a));
}
do_execsql_test 1.1 {
  ALTER TABLE c1 DROP CONSTRAINT fk;
  SELECT sql FROM sqlite_schema WHERE name='c1';
} {{CREATE TABLE c1(b)}}


#-------------------------------------------------------------------------
reset_db
do_execsql_test 2.0 {
  CREATE TABLE p1(a PRIMARY KEY);
  CREATE TABLE c1(b, CONSTRAINT fk FOREIGN KEY (b) REFERENCES p1(a));
}
do_execsql_test 2.1 {
  ALTER TABLE c1 DROP CONSTRAINT fk;
  SELECT sql FROM sqlite_schema WHERE name='c1';
} {{CREATE TABLE c1(b)}}

#-------------------------------------------------------------------------
reset_db
do_execsql_test 3.0 {
  CREATE TABLE generated(a PRIMARY KEY);
  CREATE TABLE c1(b CONSTRAINT fk REFERENCES generated(a));
}
do_execsql_test 3.1 {
  ALTER TABLE c1 DROP CONSTRAINT fk;
  SELECT sql FROM sqlite_schema WHERE name='c1';
} {{CREATE TABLE c1(b)}}

#--------------------------------------------------------------------------
reset_db

foreach {tn before after} {
  1 "CREATE TABLE c1(b CONSTRAINT fk REFERENCES p1(a))"
    "CREATE TABLE c1(b)"

  2 "CREATE TABLE c1(b, c, CONSTRAINT fk FOREIGN key (c, b) REFERENCES p1(o,t))"
    "CREATE TABLE c1(b, c)"

  3 "CREATE TABLE c1(b, generated, 
       CONSTRAINT fk FOREIGN key (generated) REFERENCES p1(o))"
    "CREATE TABLE c1(b, generated)"

  4 "CREATE TABLE c1(b, generated CONSTRAINT fk REFERENCES p1(o) NOT NULL)"
    "CREATE TABLE c1(b, generated NOT NULL)"

  5 "CREATE TABLE c1(b, generated CONSTRAINT fk REFERENCES x1)"
    "CREATE TABLE c1(b, generated)"
} {
  do_execsql_test 4.$tn.1 { DROP TABLE IF EXISTS c1 }
  do_execsql_test 4.$tn.2 $before
  do_execsql_test 4.$tn.3 { ALTER TABLE c1 DROP CONSTRAINT fk }
  do_execsql_test 4.$tn.4 { 
    SELECT sql FROM sqlite_schema WHERE name='c1' 
  } [list $after]
}

#-------------------------------------------------------------------------
reset_db
do_execsql_test 5.0 {
  CREATE TABLE x1(a, b CONSTRAINT ott REFERENCES x2);
  PRAGMA writable_schema = 1;
  UPDATE sqlite_schema SET sql='CREATE TABLE x1(a, b CONSTRAINT ott REFERENCES';
}

do_execsql_test 5.1 {
  ALTER TABLE x1 DROP CONSTRAINT ott;
}

do_execsql_test 5.2 {
  SELECT sql FROM sqlite_schema
} {{CREATE TABLE x1(a, b }}

finish_test