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When writing SQL for use on more than one database management system, make your SQL statements as explicit as possible. Even if more than one server supports a given SQL statement, it may be a mistake to assume that default behavior is the same on each system.
In SQL Anywhere, the database server and the SQL preprocessor (sqlpp) can identify SQL statements that are vendor extensions, are non-compliant with respect to a specific ISO/ANSI SQL standard, or are not supported by UltraLite. This functionality is called the SQL Flagger. See Testing SQL compliance using the SQL Flagger.
General guidelines applicable to writing compatible SQL include:
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