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Which of the following is not a type of integrity constraint in SQL?
- a)Primary Key Constraint
- b)Unique Constraint
- c)Foreign Key Constraint
- d)Union Constraint
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Which of the following is not a type of integrity constraint in SQL?a)...
In SQL, primary key, unique, and foreign key constraints are types of integrity constraints used to maintain data integrity. However, a "union constraint" is not a recognized type of constraint in SQL.
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Which of the following is not a type of integrity constraint in SQL?a)...
Primary Key Constraint:
- A primary key constraint is used to enforce the uniqueness and non-nullability of a column or a set of columns in a table.
- It ensures that every row in the table has a unique identifier and that the identifier cannot be null.
- This constraint is used to uniquely identify each record in a table and is often used as a reference for foreign key constraints.
Unique Constraint:
- A unique constraint is used to enforce the uniqueness of values in one or more columns in a table.
- It ensures that no two rows in the table have the same values for the specified columns.
- Unlike the primary key constraint, a unique constraint allows null values in the columns.
Foreign Key Constraint:
- A foreign key constraint is used to enforce referential integrity between two tables.
- It ensures that the values in a column (or a set of columns) in one table match the values in a column (or a set of columns) in another table.
- This constraint is used to establish relationships between tables and maintain data consistency.
Union Constraint:
- There is no such thing as a "union constraint" in SQL.
- The term "union" refers to a set operation in SQL that combines the results of two or more SELECT statements into a single result set.
- It does not enforce any constraints on the data.
Conclusion:
- The correct answer is option 'D' because a union constraint is not a type of integrity constraint in SQL.
- The other options (a, b, c) are all valid types of integrity constraints that are used to ensure data integrity and consistency in a database.
- A primary key constraint is used to enforce the uniqueness and non-nullability of a column or a set of columns in a table.
- It ensures that every row in the table has a unique identifier and that the identifier cannot be null.
- This constraint is used to uniquely identify each record in a table and is often used as a reference for foreign key constraints.
Unique Constraint:
- A unique constraint is used to enforce the uniqueness of values in one or more columns in a table.
- It ensures that no two rows in the table have the same values for the specified columns.
- Unlike the primary key constraint, a unique constraint allows null values in the columns.
Foreign Key Constraint:
- A foreign key constraint is used to enforce referential integrity between two tables.
- It ensures that the values in a column (or a set of columns) in one table match the values in a column (or a set of columns) in another table.
- This constraint is used to establish relationships between tables and maintain data consistency.
Union Constraint:
- There is no such thing as a "union constraint" in SQL.
- The term "union" refers to a set operation in SQL that combines the results of two or more SELECT statements into a single result set.
- It does not enforce any constraints on the data.
Conclusion:
- The correct answer is option 'D' because a union constraint is not a type of integrity constraint in SQL.
- The other options (a, b, c) are all valid types of integrity constraints that are used to ensure data integrity and consistency in a database.
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Which of the following is not a type of integrity constraint in SQL?a)Primary Key Constraintb)Unique Constraintc)Foreign Key Constraintd)Union ConstraintCorrect answer is option 'D'. Can you explain this answer?
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