What is difference between DELETE and TRUNCATE commands?

CuriousTab

Discussion

Home ‣ Interview ‣ Technology See What Others Are Saying!

Question
What is difference between DELETE and TRUNCATE commands?

Correct Answer

Delete command removes the rows from a table based on the condition that we provide with a WHERE clause Truncate will actually remove all the rows from a table and there will be no data in the table after we run the truncate command TRUNCATE: - TRUNCATE is faster and uses fewer system and transaction log resources than DELETE - TRUNCATE removes the data by deallocating the data pages used to store the table's data, and only the page deallocations are recorded in the transaction log - TRUNCATE removes all rows from a table, but the table structure, its columns, constraints, indexes and so on, remains The counter used by an identity for new rows is reset to the seed for the column - You cannot use TRUNCATE TABLE on a table referenced by a FOREIGN KEY constraint Because TRUNCATE TABLE is not logged, it cannot activate a trigger - TRUNCATE cannot be rolled back - TRUNCATE is DDL Command - TRUNCATE Resets identity of the table DELETE: - DELETE removes rows one at a time and records an entry in the transaction log for each deleted row - If you want to retain the identity counter, use DELETE instead If you want to remove table definition and its data, use the DROP TABLE statement - DELETE Can be used with or without a WHERE clause - DELETE Activates Triggers - DELETE can be rolled back - DELETE is DML Command - DELETE does not reset identity of the table Note: DELETE and TRUNCATE both can be rolled back when surrounded by TRANSACTION if the current session is not closed If TRUNCATE is written in Query Editor surrounded by TRANSACTION and if session is closed, it can not be rolled back but DELETE can be rolled back

More questions

1. How would you automatically transfer your visitors to a new web page?

Discuss

Correct Answer: - You can do it with the help of meta tag mentioned below:

<META HTTP-EQUIV="Refresh" CONTENT="2"; URL="https://wwwyoursitecom">

Place this tag between <HEAD></HEAD> - It will load yousitecom in 2 seconds

3. Cash Reserve Ratio ( CRR) and Stautory Liquidity Ratio (SLR ) are terms most closely related to which of the following industries/markets :
Options
A. Mutual Fund
B. Income Tax
C. Stock Exchange
D. Banking

Discuss