SET
ModificationSpecifies which columns to update and their new values in an UPDATE statement.
Syntax
UPDATE table SET col1 = val1, col2 = val2
Example
UPDATE users
SET name = 'New Name',
updated_at = NOW()
WHERE id = 42;About SQL SET
The SET keyword belongs to the Modification category of SQL statements. Specifies which columns to update and their new values in an UPDATE statement. Understanding this command is essential for any developer working with relational databases like PostgreSQL, MySQL, SQLite, or SQL Server.
SQL (Structured Query Language) is the standard language for managing and querying relational databases. The SET statement is supported across all major database systems, though specific syntax may vary slightly between PostgreSQL, MySQL, MariaDB, Oracle, SQL Server, and SQLite. Always consult your database's documentation for vendor-specific features and limitations.
Best practices for using SET: always test queries on a development database before running them in production, use parameterized queries to prevent SQL injection, and leverage EXPLAIN to understand query performance. For complex queries, consider using CTEs (Common Table Expressions) to improve readability and maintainability.