                     ----------  Create Referential ----------

   ե󥷥롦󥹥ȥ쥤ȤˤĤΥơ֥뤬ޤޤޤ«줿
 ơ֥ơ֥Ǥꡢ«ơ֥ϡ«줿ơ֥뤬
 ˻Ȥơ֥Ǥޤ

   ե󥷥롦󥹥ȥ쥤Ȥꤹȡ«줿ơ֥ΰİʾ
 °ʹ«줿°ˤ«ơ֥ΰİʾ°ʹ«°ˤȷ
 礵ޤ

   «°Υǡȿϡб빴«줿°Υǡȿ˰פ
 Фʤޤ

 ιʸ

create | referential | [| constraint |] [constraint name]
       | refer       |  | check      |

       [on] CONSTRAINT_LIST  | insert |  CONSTRAINT_LIST;
                             | delete |


CONSTRAINT_LIST :

            | TABLE (ATTR_NAME {,ATTR_NAME})   |
            | TABLE set ATTR_NAME {,ATTR_NAME} |

   insert «ϡ«줿ơ֥쥳ɤФơ«줿°
 ͤ«ơ֥ΡʤȤĤΥ쥳ɤб°ͤˡ
 ʤФʤʤȤȤ̣ޤ

   delete «ϡ«줿ơ֥뤫쥳ɤФơ«줿
 °ͤ«ơ֥Τɤ줫Υ쥳ɤб롢°ͤƤ
 ʤȤȤ̣ޤ

   «줿ơ֥ʣϿ«°ȥޥå顢Ĥ
 ΤϿ«ơ֥򻲾Ȥ˺ޤǸϿ
 Ф delete «δबʤФʤޤ

   update ̿ delete θ insert ¹Ԥ뤳ȤƱͤǤ줾Υե
 󥷥롦󥹥ȥ쥤Ȥɾޤ

   null ͤä«줿°Ϲ«ɾѤޤ󡣤Ĥ°
 «ƤƤͤ null Ǥä顢«̵ȤƱͤȤʤޤ

   ե󥷥롦󥹥ȥ쥤Ȥθ̤ŪǤꡢ«ꤷ
 ꤷ«θ̤ϼޤ

   ʣι«ơ֥ȤˤĤ뤳ȤǤ«ȤǰĤΥơ֥뤬
 Ʊ˹««뤳ȤǤޤ

   «ϡ"display table" ޥɤˤäƸ뤳ȤǤޤ

   ե󥷥롦󥹥ȥ쥤Ȥޤκݡơ֥ϥǡǻ
 Ƥ٥ǥåޤ

   ˾ɬפʾϡʲ˼ޥɤϤƤ

                help range_check;
                help drop_referential;
