1. Introduction : OpenAPI Concepts and Processes : SQL Syntax
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SQL Syntax
In general, OpenAPI supports SQL syntax identical to that supported by embedded SQL and the Ingres terminal monitors. OpenAPI does not support some embedded SQL statements and supports some SQL statements through OpenAPI functions rather than through an SQL statement. OpenAPI does not support any of the Ingres forms or 4GL statements.
More information:
Mapping of SQL to OpenAPI
SQL Syntax