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SQL REFERENCE

Structured Query Language (SQL) is a straightforward subject, partly because
it doesn't do much, and partly because the language is standardized. Most
modern databases use a variant of SQL that, for the most part, conforms to the
American National Standards Institute (ANSI) 92 standard. That standard
means you can use similar, although not quite identical, SQL code to access
many different databases. Fortunately, for basic operations, there's no
difference between most common databases.
SQL lets you perform four basic operations:
§ SELECT - Retrieve data
§ INSERT - Add data
§ UPDATE - Change data
§ DELETE - Remove data