TRUNCATE Command in MySQL Workbench

  • In MySQL Workbench, the `TRUNCATE` command is used to remove all rows from a table, effectively resetting the table to an empty state.
  • It's a fast and efficient way to delete all data from a table compared to the `DELETE` command, which removes rows one by one.
Here's the syntax of the `TRUNCATE` command:


    TRUNCATE TABLE table_name;

Let's break down the components:

  • TRUNCATE: The keyword indicating the type of operation to be performed.
  • TABLE: A keyword specifying that the operation is being performed on a table.
  • table_name: The name of the table from which you want to remove all rows.
Example:


    TRUNCATE TABLE employees;

  • After executing this command, the employees table will become empty:
Keep in mind the following points:
  • TRUNCATE is not reversible. Once you truncate a table, the data is gone permanently.
  • TRUNCATE is typically faster than using DELETE because it doesn't generate individual row deletions.
  • Truncating a table also resets any AUTO_INCREMENT values to their initial state.
  • TRUNCATE cannot be used on tables that are referenced by foreign key constraints, unless you first remove those constraints.
  • Always exercise caution when using the TRUNCATE command, as it can lead to data loss if not used appropriately.

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