- A A reusable program that returns a single value
- B A type of trigger that executes SQL statements automatically
- C A temporary table used for data storage
- D A mechanism for defining custom data types in the database
Stored functions and triggers - MySQL - Quiz
- A FUNCTION
- B PROCEDURE
- C TRIGGER
- D TABLE
- A They can modify data in the database
- B They can only return a single value
- C They can be called from triggers only
- D They are executed automatically when a specific event occurs
- A EXECUTE
- B SELECT
- C CALL
- D RETURN
- A DROP PROCEDURE
- B DROP FUNCTION
- C DROP TRIGGER
- D DROP DATABASE
- A Stored function
- B Stored procedure
- C Trigger
- D View
- A BEFORE
- B AFTER
- C WHEN
- D ON
- A Updating multiple records in a table
- B Inserting data into multiple tables simultaneously
- C Retrieving the total count of records in a table
- D Executing complex SQL queries
- A They can return result sets
- B They can be called explicitly
- C They can modify data in the database
- D They are invoked by stored procedures only
- A CREATE PROCEDURE
- B CREATE TRIGGER
- C CREATE FUNCTION
- D CREATE TABLE
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Stored functions and triggers - MySQL - Quiz
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- A. A reusable program that returns a single value
- B. A type of trigger that executes SQL statements automatically
- C. A temporary table used for data storage
- D. A mechanism for defining custom data types in the database
Remarks:
Explanation:
A stored function in MySQL is a reusable program that is stored in the database and can be called multiple times. It performs a specific task and returns a single value as a result. Stored functions are commonly used for calculations, data manipulation, and complex data operations.
- A. FUNCTION
- B. PROCEDURE
- C. TRIGGER
- D. TABLE
Remarks:
Explanation:
The keyword "FUNCTION" is used to create a stored function in MySQL. It is followed by the function name, input parameters, and the function body that contains the logic and calculations. A stored function is defined using the "CREATE FUNCTION" statement in MySQL.
- A. They can modify data in the database
- B. They can only return a single value
- C. They can be called from triggers only
- D. They are executed automatically when a specific event occurs
Remarks:
Explanation:
A characteristic of stored functions in MySQL is that they can only return a single value. They are designed to perform a specific task and provide a result as a single value, such as a numeric value, string, or boolean.
- A. EXECUTE
- B. SELECT
- C. CALL
- D. RETURN
Remarks:
Explanation:
The "CALL" statement is used to call a stored function in MySQL. It is followed by the function name and any required input parameters. The result of the function can be stored in a variable or used directly in a query.
- A. DROP PROCEDURE
- B. DROP FUNCTION
- C. DROP TRIGGER
- D. DROP DATABASE
Remarks:
Explanation:
The "DROP FUNCTION" statement is used to drop a stored function in MySQL. It removes the function definition and its associated code from the database. After dropping a function, it can no longer be invoked or used.
- A. Stored function
- B. Stored procedure
- C. Trigger
- D. View
Remarks:
Explanation:
A trigger is a MySQL object that is used to automatically execute SQL statements in response to specific events, such as INSERT, UPDATE, or DELETE operations on a table. Triggers are defined to perform actions based on the occurrence of predefined events.
- A. BEFORE
- B. AFTER
- C. WHEN
- D. ON
Remarks:
Explanation:
The keyword "BEFORE" is used to define the timing of a trigger in MySQL. It specifies that the trigger should be executed before the corresponding event, such as a row insertion, update, or deletion.
- A. Updating multiple records in a table
- B. Inserting data into multiple tables simultaneously
- C. Retrieving the total count of records in a table
- D. Executing complex SQL queries
Remarks:
Explanation:
A stored function in MySQL would be useful in a scenario where you need to retrieve the total count of records in a table. The function can encapsulate the logic to calculate the count and return it as a single value.
- A. They can return result sets
- B. They can be called explicitly
- C. They can modify data in the database
- D. They are invoked by stored procedures only
Remarks:
Explanation:
A characteristic of triggers in MySQL is that they can modify data in the database. Triggers are capable of executing SQL statements that update, insert, or delete records based on specific events.
- A. CREATE PROCEDURE
- B. CREATE TRIGGER
- C. CREATE FUNCTION
- D. CREATE TABLE
Remarks:
Explanation:
The "CREATE TRIGGER" statement is used to create a trigger in MySQL. It defines the trigger name, timing, event, and the actions to be performed when the event occurs.