Check constraint: one column must less than another column : Check « Table « Oracle PL/SQL Tutorial






  1. Oracle PL/SQL Tutorial
  2. Table
  3. Check
SQL>
SQL> create table salgrades
  2  ( grade      NUMBER(2)   constraint S_PK
  3                           primary key
  4  , lowerlimit NUMBER(6,2) constraint S_LOWER_NN
  5                           not null
  6                           constraint S_LOWER_CHK
  7                           check (lowerlimit >= 0)
  8  , upperlimit NUMBER(6,2) constraint S_UPPER_NN
  9                           not null
 10  , bonus      NUMBER(6,2) constraint S_BONUS_NN
 11                           not null
 12  , constraint S_LO_UP_CHK check
 13                           (lowerlimit <= upperlimit)
 14  );

Table created.

SQL>
SQL>
SQL> drop table salgrades;

Table dropped.

SQL>
SQL>








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
6.13.11.Add constraint to ensure that value from one column is bigger than that from another
6.13.12.Salary column value cannot be greater than 1000
6.13.13.Setting CHECK constraint for number type field
6.13.14.Setting the Regular expression check for varchar field
6.13.15.Use char function to build default column value
6.13.16.Use decode() function in check constraints
6.13.17.Violate a ckeck constraint
6.13.18.Must be upper case