Must be upper case : Check « Table « Oracle PL/SQL Tutorial

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.

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