Computer Science Engineering (CSE) Exam > Computer Science Engineering (CSE) Questions > Which of the following is not a DDL command?a...
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Which of the following is not a DDL command?
- a)UPDATE
- b)TRUNCATE
- c)ALTER
- d)None of the Mentioned
Correct answer is option 'A'. Can you explain this answer?
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Which of the following is not a DDL command?a)UPDATEb)TRUNCATEc)ALTERd...
Data definition language (DDL) commands enable you to perform the following tasks:Create, alter, and drop schema objects.
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Which of the following is not a DDL command?a)UPDATEb)TRUNCATEc)ALTERd...
Understanding DDL and DML Commands
In database management, commands are categorized into different types based on their functionality. DDL (Data Definition Language) and DML (Data Manipulation Language) are two primary categories.
What is DDL?
- DDL is used to define and manage all structures in a database.
- Common DDL commands include:
- CREATE: To create new database objects like tables.
- ALTER: To modify existing database objects.
- TRUNCATE: To remove all records from a table while keeping the structure intact.
What is DML?
- DML is used for manipulating data within existing structures.
- Common DML commands include:
- INSERT: To add new records to a table.
- UPDATE: To modify existing records in a table.
- DELETE: To remove records from a table.
Why is UPDATE not a DDL Command?
- The UPDATE command is categorized under DML because it deals with modifying the data within the database.
- It changes the content of existing records rather than altering the structure of the database itself.
Summary of Options
- Option A: UPDATE - Correctly identified as a DML command.
- Option B: TRUNCATE - A DDL command.
- Option C: ALTER - A DDL command.
- Option D: None of the Mentioned - Incorrect, as option A is a valid answer.
In conclusion, the correct answer is option A, as it is not a DDL command but a DML command used for data manipulation. Understanding these distinctions helps in effectively managing and manipulating databases.
In database management, commands are categorized into different types based on their functionality. DDL (Data Definition Language) and DML (Data Manipulation Language) are two primary categories.
What is DDL?
- DDL is used to define and manage all structures in a database.
- Common DDL commands include:
- CREATE: To create new database objects like tables.
- ALTER: To modify existing database objects.
- TRUNCATE: To remove all records from a table while keeping the structure intact.
What is DML?
- DML is used for manipulating data within existing structures.
- Common DML commands include:
- INSERT: To add new records to a table.
- UPDATE: To modify existing records in a table.
- DELETE: To remove records from a table.
Why is UPDATE not a DDL Command?
- The UPDATE command is categorized under DML because it deals with modifying the data within the database.
- It changes the content of existing records rather than altering the structure of the database itself.
Summary of Options
- Option A: UPDATE - Correctly identified as a DML command.
- Option B: TRUNCATE - A DDL command.
- Option C: ALTER - A DDL command.
- Option D: None of the Mentioned - Incorrect, as option A is a valid answer.
In conclusion, the correct answer is option A, as it is not a DDL command but a DML command used for data manipulation. Understanding these distinctions helps in effectively managing and manipulating databases.
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Which of the following is not a DDL command?a)UPDATEb)TRUNCATEc)ALTERd)None of the MentionedCorrect answer is option 'A'. Can you explain this answer?
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