Just to extend a little bit. Basically there are two types of database "languages" - DDL and DML. DML (Data Manipulate Language) is a set of statements that can be used to operate on the data, for example insert/delete/update. DDL (Data Definition Language) is a set of statements used to operate on the definition of database components, for example create/alter.

In reply to Re^2: DBI, add fields to existing table? by pg
in thread DBI, add fields to existing table? by Elijah

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