SQL Update Command

Galaxy Glossary

How do you modify existing data in a SQL table?

The SQL UPDATE command is used to modify existing data in a table. It allows you to change values in specific rows based on conditions. This is a fundamental operation for maintaining and updating database information.
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Description

The UPDATE statement is a crucial part of any SQL developer's toolkit. It allows you to change the values of columns in one or more rows of a table. This is essential for keeping your database data current and accurate. Think of it as the SQL equivalent of editing a spreadsheet. You can update individual cells (columns) or entire rows of data based on specific criteria. This command is powerful because it lets you target specific rows using conditions, ensuring you only modify the intended data. For instance, you might update customer addresses, change product prices, or modify order details. The flexibility of the UPDATE statement is key to maintaining a dynamic and responsive database.

Why SQL Update Command is important

The UPDATE command is essential for maintaining accurate and up-to-date data in a database. It's used in countless applications, from e-commerce platforms to inventory management systems. Without the ability to modify data, databases would quickly become outdated and useless.

Example Usage


SELECT CURDATE();
SELECT CURRENT_DATE;
SELECT NOW();
SELECT CURRENT_TIMESTAMP;
SELECT GETDATE(); -- For SQL Server
SELECT SYSDATE(); -- For Oracle

Common Mistakes

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