Sql, including: Pl/sql, Call Level Interface, Foreign Key, Transact-sql, Data Definition Language, Sql Injection, Data Manipulation Language, Rollback ... Data Control Language, Pl/pgsql, Query Plan

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More info: SQL (officially like "S-Q-L" but often like "sequel"), often (erroneously) referred to as Structured Query Language, and became the most widely used language for relational databases.