490  9

. 9.8

   

  Index Options ( )   -
 :

Unique            , 
       
. ,      fio  -
        -
,   

Descending           -
   (   -
    )

Case Sensitive         -
,    

Maintained      ,     
  .      -
          -
.     .  
     .   -
   ,     

 ,   ,    . 
 (. 9.9),      .

. 9.9

  

9.2.3.4 Referential Integrity     

         
   . 9.6: Referential Integrity     . 
  ,       -
 .        
,      (),    
 (),       (  
),          ( ) 