“ORDER BY … USING” clause in PostgreSQL

Question

The ORDER BY clause is decribed in the PostgreSQLdocumentation as:

ORDER BY expression [ ASC | DESC | USING operator ] [ NULLS { FIRST | LAST } ] [, ...]
         


        

Answer 1

Optionally one can add the key word ASC (ascending) or DESC (descending) after any expression in the ORDER BY clause. If not specified, ASC is assumed by default. Alternatively, a specific ordering operator name can be specified in the USING clause. An ordering operator must be a less-than or greater-than member of some B-tree operator family. ASC is usually equivalent to USING < and DESC is usually equivalent to USING >.

PostgreSQL 9.0

It may look something like this I think (I don't have postgres to verify this right now, but will verify later)

SELECT Name FROM Person
ORDER BY NameId USING >