Could only contain three values : Constraint Check « Constraints « Oracle PL / SQL

Could only contain three values

    

SQL>
SQL>
SQL> create table courses
  2  ( code        VARCHAR2(6)  constraint C_PK           primary key
  3  , description VARCHAR2(30) constraint C_DESC_NN      not null
  4  , category    CHAR(3)      constraint C_TYPE_NN      not null
  5  , duration    NUMBER(2)    constraint C_DUR_NN       not null
  6  , constraint  C_CODE_CHK   check                     (code = upper(code))
  7  , constraint  C_TYPE_CHK   check                     (category in ('GEN','BLD','DSG'))
  8  ) ;

Table created.

SQL>
SQL>
SQL> drop table courses;

Table dropped.

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