ISO-based Escape Clauses
This form of the escape clause introduces SQL syntax that is supported by a specified dialect of the International Standard, but is not supported by X/Open-92.
Through this escape clause, the database can reject the clause if it does not support the specified SQL dialect.
ISO-year specifies the publication year of the standard, e.g. "1989" for the SQL89 standard.
ISO-conformance specifies the conformance level:
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