Quick Answer: Which Statement Is True About Truncate And Delete?

Is truncate DDL or DML?

Although TRUNCATE TABLE is similar to DELETE , it is classified as a DDL statement rather than a DML statement.

It differs from DELETE in the following ways: Truncate operations drop and re-create the table, which is much faster than deleting rows one by one, particularly for large tables..

What is a view Mcq?

This set of SQL Server Multiple Choice Questions & Answers (MCQs) focuses on “Views”. … Explanation: VIEW is a virtual table, through which a selective portion of the data from one or more tables can be seen. A view do not contain data of their own. 2.

Which of the following statement is true regarding delete and truncate?

Which two statements are true regarding the DELETE and TRUNCATE commands? (Choose two.) DELETE can be used to remove only rows from only one table at a time. DELETE can be used to remove only rows from multiple tables at a time. DELETE can be used only on a table that is a parent of a referential integrity constraint.

Why use truncate instead of delete?

TRUNCATE TABLE is faster and uses fewer system resources than DELETE , because DELETE scans the table to generate a count of rows that were affected then delete the rows one by one and records an entry in the database log for each deleted row, while TRUNCATE TABLE just delete all the rows without providing any …

Can we rollback truncate?

You cannot ROLLBACK TRUNCATE Simply, you cannot rollback a transaction if it is already committed but you can do something else to get the data back (or at least some parts of it). When you execute the TRUNCATE statement, your data is still in the MDF file.

What are 2 differences between delete and truncate?

Delete and truncate both commands can be used to delete data of the table. Delete is a DML command whereas truncate is DDL command. Truncate can be used to delete the entire data of the table without maintaining the integrity of the table. On the other hand , delete statement can be used for deleting the specific data.

Can we use where in truncate?

TRUNCATE cannot be executed with a WHERE clause means that all records will be removed from the TRUNCATE / statement. However, partitions can be truncated as shown in the below T-SQL statement.

Which two statements are true regarding the delete and truncate commands?

Which two statements are true regarding the DELETE and TRUNCATE commands? (Choose two.) DELETE can be used to remove only rows from only one table at a time. DELETE can be used to remove only rows from multiple tables at a time. DELETE can be used only on a table that is a parent of a referential integrity constraint.

Which two statements are true about views?

A view can be created as read only. A view can be created as a join on two or more tables. A view must have aliases defined for the column names in the SELECT statement. A view cannot be created with a GROUP BY clause in the SELECT statement.

What’s difference between truncate and delete?

Everyone should know that DELETE is DML command and TRUNCATE is DDL command. DELETE deletes records one by one and makes an entry for each and every deletion in the transaction log, whereas TRUNCATE de-allocates pages and makes an entry for de-allocation of pages in the transaction log.

What are the restrictions while using truncate?

The TRUNCATE statement fails if any of the following conditions exist: The user does not hold the Delete access privilege on the table. The table has an enabled Delete trigger, but the user lacks the Alter privilege. The specified table or synonym does not exist in the local database.

Why truncate is DDL and Delete is DML?

Truncate reinitializes the identity by making changes in data definition therefore it is DDL, whereas Delete only delete the records from the table and doesn’t make any changes in its Definition that’s why it is DML.