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UPDATE

The page explains how to update the existing data in a table with the UPDATE (DML) T-SQL command.

Pre-requisite

  • MS SQL Server
  • SQL Server Management Studio (SSMS)
  • Create/restore a Database (AdventureWorks2019)
  • Create a table, and insert some data into the table.

Syntax

UPDATE <table_name>
SET <column1>=<value1>
WHERE <column2>=<value2>

where,

  • table_name: Name of the table to update
  • column1: Name of the column to be updated
  • value1: The new value to be updated.
  • column2: column name to filter the search
  • value2: The existing value to be searched to filter the row

Before you begin

Install and restore the 'AdventureWorks2019' sample database. Create a backup table from another table as:

USE AdventureWorks2019;
GO
SELECT *
INTO PRODUCTION.PRODUCT_BACKUP
FROM PRODUCTION.PRODUCT;

Retrieve all columns/rows from the table.

SELECT * FROM PRODUCTION.PRODUCT_BACKUP;

UPDATE table

The UPDATE table allows you to update single/multiple rows in a table.

--Update all rows with the current date and time
UPDATE PRODUCTION.PRODUCT_BACKUP SET ModifiedDate = GETDATE();
--Update the color for certain products with the `WHERE` clause
UPDATE Production.Product_backup
SET Color = 'Metallic Red'
WHERE Name LIKE 'Road-250%' AND Color = 'Red';
--Update the value based on calculation on another column
UPDATE Production.Product_backup
SET ListPrice = ListPrice * 2;
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