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The exception to this rule is the postgres superuser , whose OS user id is used as the usesysid during the initdb process . She has been on two successful product launch teams for the Gynecare and Cardiovations business units of Ethicon . There must be ' <' and '> ' ordering operators having the same left and right input datatypes as the mergejoinable operator itself . These operators must be named ' <' and '> ' ; you do not have any choice in the matter , since there is no provision for specifying them explicitly . In this case it is appropriate to convert data items to a standard form when sending from the server to the client and converting from the standard format to the machine specific format when the server receives the data from the client . Normal cursors return data in text format , either ASCII or another encoding scheme depending on how the Postgres backend was built . " Count " is the most common example of this kind of aggregate .