The table sql_languages contains one row for each SQL language binding that is supported by PostgreSQL. PostgreSQL supports direct SQL and embedded SQL in C; that is all you will learn from this table.
This table was removed from the SQL standard in SQL:2008, so there are no entries referring to standards later than SQL:2003.
Table 35-43. sql_languages Columns
|sql_language_source||character_data||The name of the source of the language definition; always ISO 9075, that is, the SQL standard|
|sql_language_year||character_data||The year the standard referenced in sql_language_source was approved.|
|sql_language_conformance||character_data||The standard conformance level for the language binding. For ISO 9075:2003 this is always CORE.|
|sql_language_integrity||character_data||Always null (This value is relevant to an earlier version of the SQL standard.)|
|sql_language_binding_style||character_data||The language binding style, either DIRECT or EMBEDDED|
|sql_language_programming_language||character_data||The programming language, if the binding style is EMBEDDED, else null. PostgreSQL only supports the language C.|
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