SQLite

  ** Otherwise, for a composite foreign key (more than one column), allocate
  ** space for the aiCol array (returned via output parameter *paiCol).
  ** Non-composite foreign keys do not require the aiCol array.
  */
  if( nCol==1 ){
    /* The FK maps to the IPK if any of the following are true:
    **

    **   1) There is an INTEGER PRIMARY KEY column and the FK is implicitly 
    **      mapped to the primary key of table pParent, or
    **   2) The FK is explicitly mapped to a column declared as INTEGER
    **      PRIMARY KEY.
    */

    if( pParent->iPKey>=0 ){
      if( !zKey ) return 0;
      if( !sqlite3StrICmp(pParent->aCol[pParent->iPKey].zName, zKey) ) return 0;
    }
  }else if( paiCol ){
    assert( nCol>1 );
    aiCol = (int *)sqlite3DbMallocRaw(pParse->db, nCol*sizeof(int));

  PRAGMA foreign_keys = on;
  CREATE TABLE t1(a PRIMARY KEY, b);
  CREATE TABLE t2(c REFERENCES t1(a) /D/ , d);

  CREATE TABLE t3(a PRIMARY KEY, b);
  CREATE TABLE t4(c REFERENCES t3 /D/, d);




  CREATE TABLE t7(a, b INTEGER PRIMARY KEY);
  CREATE TABLE t8(c REFERENCES t7 /D/, d);

  CREATE TABLE t9(a REFERENCES nosuchtable, b);
  CREATE TABLE t10(a REFERENCES t9(c) /D/, b);
}
set FkeySimpleTests {

  1.12 "UPDATE t1 SET a = 2"              {1 {foreign key constraint failed}}
  1.13 "UPDATE t1 SET a = 1"              {0 {}}

  2.1  "INSERT INTO t4 VALUES(1, 3)"      {1 {foreign key constraint failed}}
  2.2  "INSERT INTO t3 VALUES(1, 2)"      {0 {}}
  2.3  "INSERT INTO t4 VALUES(1, 3)"      {0 {}}





  4.1  "INSERT INTO t8 VALUES(1, 3)"      {1 {foreign key constraint failed}}
  4.2  "INSERT INTO t7 VALUES(2, 1)"      {0 {}}
  4.3  "INSERT INTO t8 VALUES(1, 3)"      {0 {}}
  4.4  "INSERT INTO t8 VALUES(2, 4)"      {1 {foreign key constraint failed}}
  4.5  "INSERT INTO t8 VALUES(NULL, 4)"   {0 {}}
  4.6  "UPDATE t8 SET c=2 WHERE d=4"      {1 {foreign key constraint failed}}
  4.7  "UPDATE t8 SET c=1 WHERE d=4"      {0 {}}

  do_test fkey2-10.1.$tn {
    execsql $zSql
    catchsql { INSERT INTO c DEFAULT VALUES }
  } {1 {foreign key mismatch}}
}

# "rowid" cannot be used as part of a child or parent key definition 
# unless it happens to be the name of an explicitly declared column.
#
do_test fkey2-10.2.1 {
  drop_all_tables
  catchsql {
    CREATE TABLE t1(a PRIMARY KEY, b);
    CREATE TABLE t2(c, d, FOREIGN KEY(rowid) REFERENCES t1(a));
  }
} {1 {unknown column "rowid" in foreign key definition}}
do_test fkey2-10.2.2 {
  drop_all_tables
  catchsql {
    CREATE TABLE t1(a PRIMARY KEY, b);
    CREATE TABLE t2(rowid, d, FOREIGN KEY(rowid) REFERENCES t1(a));
  }
} {0 {}}
do_test fkey2-10.2.1 {
  drop_all_tables
  catchsql {
    CREATE TABLE t1(a, b);
    CREATE TABLE t2(c, d, FOREIGN KEY(c) REFERENCES t1(rowid));
    INSERT INTO t1(rowid, a, b) VALUES(1, 1, 1);
    INSERT INTO t2 VALUES(1, 1);
  }
} {1 {foreign key mismatch}}
do_test fkey2-10.2.2 {
  drop_all_tables
  catchsql {
    CREATE TABLE t1(rowid PRIMARY KEY, b);
    CREATE TABLE t2(c, d, FOREIGN KEY(c) REFERENCES t1(rowid));
    INSERT INTO t1(rowid, b) VALUES(1, 1);
    INSERT INTO t2 VALUES(1, 1);
  }
} {0 {}}


#-------------------------------------------------------------------------
# The following tests, fkey2-11.*, test CASCADE actions.
#
drop_all_tables