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PostgreSQL (/ ˌ p oʊ s t ɡ r ɛ s k j u ˈ ɛ l / POHST-gres-kew-EL) [11] [12] also known as Postgres, is a free and open-source relational database management system (RDBMS) emphasizing extensibility and SQL compliance.
In MySQL, UTF-8 is called utf8mb4, [78] while utf8 and utf8mb3 refer to the obsolete CESU-8 variant. [79] In Oracle Database (since version 9.0), AL32UTF8 [80] means UTF-8, while UTF-8 means CESU-8. In HP PCL, the Symbol-ID for UTF-8 is 18N. [81] There are several current definitions of UTF-8 in various standards documents: