Home >Database >SQL >What is the command in sql to delete records

What is the command in sql to delete records

下次还敢
下次还敢Original
2024-05-02 01:15:26873browse

The command used to delete records in SQL is DELETE. The syntax of the DELETE command is: DELETE FROM table_name WHERE condition. The condition parameter specifies the record condition to be deleted. If no condition is specified, all records in the table will be deleted.

What is the command in sql to delete records

The command used to delete records in SQL

The command used to delete records in SQL is DELETE.

Syntax

<code class="sql">DELETE FROM table_name
WHERE condition;</code>

Parameters

  • table_name: The name of the table to delete records
  • condition: Specifies the condition for which records to delete

How it works

The DELETE command is passed by specifying an or Multiple conditions to delete records from table. It deletes all records that meet the criteria. If no condition is specified, all records in the table will be deleted, so use caution.

Example

The following query will delete the records of all customers older than 40 years old from the "Customers" table:

<code class="sql">DELETE FROM Customers
WHERE Age > 40;</code>

Note Item

  • DELETE is a permanent operation and cannot be undone. Before executing the DELETE command, make sure you have backed up your data.
  • Use the DELETE command with caution as it can affect the integrity of the affected tables.
  • Before performing a DELETE operation, consider using the TRUNCATE command as it is faster and more efficient.

The above is the detailed content of What is the command in sql to delete records. For more information, please follow other related articles on the PHP Chinese website!

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn