Question
What is CHECK constraint. Explain with example?
Answers
- A CHECK constraint is one of the constraints to ensure data integrity
- CHECK constraint is specified as a condition / criteria
- The value that is to be inserted or updated in a table, need to be tested by the CHECK constraint
- If the value is meeting the criteria, then the data is inserted or updated in the designated column of a table
- CHECK constraint is used at the time of creation of a table
- The following example illustrates the use of CHECK constraint:
CREATE TABLE PRODUCT (PROD_ID INTEGER NOT NULL,
QUANTITY INTEGER CHECK (QUANTITY >= 1)   Your Comment




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