ROLLBACK
TransactionUndoes all changes made during the current transaction.
Syntax
ROLLBACK [TO SAVEPOINT name]
Example
BEGIN; DELETE FROM orders WHERE id = 123; -- Oops, wrong order! ROLLBACK;
About SQL ROLLBACK
The ROLLBACK keyword belongs to the Transaction category of SQL statements. Undoes all changes made during the current transaction. 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 ROLLBACK 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 ROLLBACK: 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.