- A DDL is used to retrieve data from the database.
- B DDL is used to define and modify the structure of the database objects.
- C DDL is used to perform mathematical calculations on the data.
- D DDL is used to filter and sort the data in the database.
Data definition language - MySQL - Quiz
- A INSERT
- B UPDATE
- C SELECT
- D CREATE
- A DROP is used to delete data from a table.
- B DROP is used to delete a database.
- C DROP is used to delete a specific column from a table.
- D DROP is used to delete a table or other database objects.
- A ALTER TABLE
- B RENAME TABLE
- C MODIFY TABLE
- D UPDATE TABLE
- A CREATE INDEX
- B ALTER INDEX
- C ADD INDEX
- D MODIFY INDEX
- A DROP COLUMN
- B DELETE COLUMN
- C REMOVE COLUMN
- D ALTER COLUMN
- A CREATE DATABASE
- B ALTER DATABASE
- C ADD DATABASE
- D MAKE DATABASE
- A TRUNCATE TABLE deletes the table structure and its data.
- B TRUNCATE TABLE removes the table structure but preserves its data.
- C TRUNCATE TABLE only removes the data from a table.
- D TRUNCATE TABLE is not a valid statement in MySQL.
- A MODIFY COLUMN
- B RENAME COLUMN
- C UPDATE COLUMN
- D CHANGE COLUMN
- A CREATE UNIQUE INDEX
- B CREATE COMPOSITE INDEX
- C CREATE INDEX
- D CREATE MULTIKEY INDEX
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Data definition language - MySQL - Quiz
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- A. DDL is used to retrieve data from the database.
- B. DDL is used to define and modify the structure of the database objects.
- C. DDL is used to perform mathematical calculations on the data.
- D. DDL is used to filter and sort the data in the database.
Remarks:
Explanation:
DDL in MySQL is used to define and modify the structure of database objects such as tables, views, indexes, and constraints. It includes statements like CREATE, ALTER, and DROP to create, modify, or delete the database objects.
- A. INSERT
- B. UPDATE
- C. SELECT
- D. CREATE
Remarks:
Explanation:
The CREATE statement in MySQL is used to create a new table. It specifies the table name, column names, data types, and any constraints or indexes associated with the table.
- A. DROP is used to delete data from a table.
- B. DROP is used to delete a database.
- C. DROP is used to delete a specific column from a table.
- D. DROP is used to delete a table or other database objects.
Remarks:
Explanation:
The DROP statement in MySQL is used to delete a table, view, index, or other database objects. It permanently removes the specified object from the database.
- A. ALTER TABLE
- B. RENAME TABLE
- C. MODIFY TABLE
- D. UPDATE TABLE
Remarks:
Explanation:
The RENAME TABLE statement in MySQL is used to rename a table. It allows you to change the name of an existing table in the database.
- A. CREATE INDEX
- B. ALTER INDEX
- C. ADD INDEX
- D. MODIFY INDEX
Remarks:
Explanation:
The CREATE INDEX statement in MySQL is used to create a new index on one or more columns of a table. Indexes improve query performance by allowing faster data retrieval based on the indexed columns.
- A. DROP COLUMN
- B. DELETE COLUMN
- C. REMOVE COLUMN
- D. ALTER COLUMN
Remarks:
Explanation:
The DROP COLUMN statement in MySQL is used to remove a column from an existing table. It permanently deletes the specified column and its associated data from the table.
- A. CREATE DATABASE
- B. ALTER DATABASE
- C. ADD DATABASE
- D. MAKE DATABASE
Remarks:
Explanation:
The CREATE DATABASE statement in MySQL is used to create a new database. It specifies the name of the database and optional character set and collation settings.
- A. TRUNCATE TABLE deletes the table structure and its data.
- B. TRUNCATE TABLE removes the table structure but preserves its data.
- C. TRUNCATE TABLE only removes the data from a table.
- D. TRUNCATE TABLE is not a valid statement in MySQL.
Remarks:
Explanation:
The TRUNCATE TABLE statement in MySQL is used to delete all data from a table while preserving the table structure. It is a faster alternative to the DELETE statement for removing all rows from a table.
- A. MODIFY COLUMN
- B. RENAME COLUMN
- C. UPDATE COLUMN
- D. CHANGE COLUMN
Remarks:
Explanation:
The CHANGE COLUMN statement in MySQL is used to change the name of an existing column in a table. It allows you to specify the current column name and the new column name.
- A. CREATE UNIQUE INDEX
- B. CREATE COMPOSITE INDEX
- C. CREATE INDEX
- D. CREATE MULTIKEY INDEX
Remarks:
Explanation:
The CREATE INDEX statement in MySQL is used to create a new index on one or more columns of a table. It improves query performance by allowing faster data retrieval based on the indexed columns.