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What is the difference between truncate, drop and delete in the Oracle SQL database?

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truncate deletes permanently. delete - can rollback. drop - to drop the table, column.
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TRUNCATE: The TRUNCATE statement is used to remove all records from a table. It performs the same function as a DELETE statement without a WHERE clause. Further, you don't need to worry about rolling back. DROP: It is used to remove the entire table from database. DELETE: It is used to delete all/some...
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TRUNCATE: The TRUNCATE  statement is used to remove all records from a table. It performs the same function as a DELETE statement without a WHERE clause. Further, you don't need to worry about rolling back.

DROP: It is used to remove the entire table from database.

DELETE: It is used to delete all/some records from the table. A WHERE clause can be used along with DELETE statement to  remove some rows. If no WHERE condition is specified, all rows will be removed. After performing a DELETE operation, you need to COMMIT or ROLLBACK the transaction to make the change permanent or to undo it.

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How do I become master in SQL server? I am looking for real time case studies to write queries, stored procedures etc.
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I need your help to choose my career as I have three years of gap between my education. I know SQL. Can anyone tell me should I choose MS SQL server or oracle because I am interested in the database? Which one will be better to learn to get into the IT industry? Please help me! Thank you!
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You can teach students Online as well as offline. If you want to teach online you need to have a communicating media.
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