24th September 2020: PostgreSQL 13 Released!
Unsupported versions: 6.4
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Example

The following set of commands will create the “pg_opclass” class containing the int_ops collection as an object with an OID of 421, print out the class, and then close it.

create pg_opclass (opcname=name)
open pg_opclass
insert oid=421 (int_ops)
print
close pg_opclass