Differences between Delete,Drop and Truncate in sql | Postgresql | Oracle | Mysql Sql With Prashant
Differences between Delete,Drop and Truncate in sql | Postgresql | Oracle | Mysql | Sql Differences | Sql with prashant
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differences between delete,drop and truncate command
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In SQL, DELETE, DROP, and TRUNCATE are commands used for different purposes, but all related to managing data and database objects. Here's the difference between them:
DELETE:
DELETE is a Data Manipulation Language (DML) command used to remove rows from a table based on a condition specified in the WHERE clause.
It is used to selectively remove rows from a table without deleting the table structure itself.
DELETE is logged in the transaction log, which means it can be rolled back using a ROLLBACK command if it's part of an uncommitted transaction.
DELETE statements are slower compared to TRUNCATE because they generate more transaction logs and have additional processing to do.
DELETE FROM table_name WHERE condition;
DROP:
DROP is a Data Definition Language (DDL) command used to remove database objects such as tables, indexes, views, or stored procedures.
It removes the entire table structure and its data, making the table no longer exist in the database.
Dropping a table removes not just the data, but also associated indexes, triggers, and constraints.
DROP statements cannot be rolled back. Once a table is dropped, it's gone permanently.
DROP TABLE table_name;
TRUNCATE:
TRUNCATE is a DDL command used to quickly remove all rows from a table.
It deallocates data pages and releases the storage space used by the table, effectively resetting the table to empty state.
TRUNCATE is generally faster and uses fewer system and transaction log resources compared to DELETE.
Unlike DELETE, TRUNCATE cannot be rolled back, and it does not fire triggers defined on the table.
TRUNCATE TABLE table_name;
In summary:
Use DELETE when you want to remove specific rows from a table while keeping the table structure intact.
Use DROP when you want to remove an entire table or other database objects.
Use TRUNCATE when you want to quickly remove all rows from a table without logging individual row deletions and without affecting the table structure.
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