H2 supports a syntax to safely drop constraint if it not exists i.e. drop constraint if exists fk_symbol.The similar syntax is used in MariaDB: drop foreign key if exists fk_symbol but the original ...

Idempotence describes the property of operations in mathematics and computer science that means that multiple applications of the operation do not change the result. When updating a database schema, ...

What's the preferred way of checking if a table (in the database I'm using) with a certain name already exists? <BR><BR>I am using PEAR's DB class to talk to MySQL and I have an installer script ...