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How To Define A Data Field As Not Null? |
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Answer» When defining a specific RECORD type, you can define a data field as NOT NULL to make sure variables with this RECORD type to always have values in this field. A field defined as NOT NULL must have a default value. Here is a tutorial script showing you how to define a data field as NOT NULL: CREATE OR REPLACE PROCEDURE HELLO AS TYPE student IS RECORD ( id NUMBER(5) NOT NULL DEFAULT 0, first_name VARCHAR(80), last_name VARCHAR(80) ); best_student student; another_student student; class_name VARCHAR2(80); BEGIN class_name := 'FYI Center 2006'; best_student.first_name := 'The'; best_student.last_name := 'Best'; DBMS_OUTPUT.PUT_LINE('Best student ID = ' || best_student.id); DBMS_OUTPUT.PUT_LINE('Best student = ' || best_student.first_name || ' ' || best_student.last_name); END; / Best student ID = 0 Best student = The BestWhen defining a specific RECORD type, you can define a data field as NOT NULL to make sure variables with this RECORD type to always have values in this field. A field defined as NOT NULL must have a default value. Here is a tutorial script showing you how to define a data field as NOT NULL: |
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