       507

. 9.31

    

 .    ,     -
  .  CustomConstraint    SQL,
  .  ErrorMessage  
,        -
. ,      CustomConstraint :

((Sex=true) and (Year_b >1955))or((Sex=false) and (Year_b>1965))

   ErrorMessage:    >1955 ..   >195
..

           -
.

        -
  Table,         
     .

9.5.4  

      ,  
  ,       
 .      (calculated fi-
elds).        ,   -
    .     Table 1,  -
  .         
    New field ( ).   -
  ,   . 9.32.

  Field properties ( )     
(Name)        Age,   (Type)    -
  Smallint,       (Size).   
     .

    ,     Fi-
eld type  Calculated (   ).  
         ,      Age.
       DisplayLabel  .

. 9.32

    