Reference a table : Table Reference « Table « Oracle PL / SQL

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Oracle PL / SQL » Table » Table Reference 
Reference a table
 
SQL>
SQL>
SQL> create table gender_tab (
  2        gender_id  char(1),
  3        gender_nm  varchar2(6),
  4        constraint gender_pk primary key gender_id ),
  5        constraint gender_id_ck check gender_id in 'M''F' ) )
  6  );

Table created.

SQL>
SQL> insert into gender_tab values 'F''Female' );

row created.

SQL> insert into gender_tab values 'M''Male' );

row created.

SQL>
SQL>
SQL> create table people (first_name        varchar2(20),
  2                       last_name         varchar2(25),
  3                       gender         char(1)
  4  );

Table created.

SQL>
SQL> alter table people
  2  add constraint people_gender_fk
  3  foreign key gender )
  4  references gender_tab;

Table altered.

SQL>
SQL> insert into people values 'Celia', 'Rice', 'M' );

row created.

SQL> insert into people values 'Robert', 'Black', 'M' );

row created.

SQL> insert into people values 'Linda', 'Green', 'F' );

row created.

SQL>
SQL> drop table gender_tab;
drop table gender_tab
           *
ERROR at line 1:
ORA-02449: unique/primary keys in table referenced by foreign keys


SQL>
SQL> drop table gender_tab cascade constraints;

Table dropped.

SQL>
SQL>
SQL>
SQL>
           
         
  
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