Update query in sql

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The SQL UPDATE Statement

The SQL UPDATE Statement is used to modify the existing records in a table.

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This statement is a part of Data Manipulation Language (DML), as it only modifies the data present in a table without affecting the table's structure.

To filter records that needs to be modified, you can use a WHERE clause with UPDATE statement.

Using a WHERE clause, you can either update a single row or multiple rows.

Since it only interacts with the data of a table, the SQL UPDATE statement needs to used cautiously. If the rows to be modified aren't selected properly, all the rows in the table will be affected and the correct table data is either lost or needs to be reinserted.

The SQL UPDATE statement makes use of locks on each row while modifying them in a table, and once the row is modified, the lock is released.

Therefore, it can either make changes to a single row or multiple rows with a single query.

Syntax

The basic syntax of the SQL UPDATE statement with a WHERE clause is as follows −

UPDATE table_name SET column1 = value1, column2 = v

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