Check constraint with decode and nvl2 : Check « Table « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Table » Check   6. 13. 6. Check constraint with decode and nvl2 SQL> SQL> create table employees   2  ( empno      NUMBER(4)    constraint E_PK   3                            primary key   4                            constraint E_EMPNO_CHK   5                            check (empno > 7000)   6  , job        VARCHAR2(8)   7  , comm       NUMBER(6,2)   8  , constraint E_SALES_CHK  check   9                            (decode(job,'SALESREP',0,1)  10                             + nvl2(comm,          1,0) = 1)  11  ) ; Table created. SQL> SQL> drop table employees; Table dropped. 6. 13. Check 6. 13. 1.  Create a table with check constraint 6. 13. 2.  Adding a CHECK Constraint 6. 13. 3.  Use comparison operators with a CHECK constraint 6. 13. 4.  Constraint with Two conditions 6. 13. 5.  Add condition constraint with 'and' operator 6. 13. 6.  Check constraint with decode and nvl2 6. 13. 7.  Check constraint with MOD function 6. 13. 8.  A column with upper case constraint 6. 13. 9.  check constraint: must be positive value 6. 13. 10.  Check constraint: one column must less than another column

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