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When doing an ORDER BY, '''NULL values''' are presented '''first''' if you do ORDER BY ... ASC ('''default''') and last if you do ORDER BY ... DESC. <br/>
This explains why testUpdates gives the specified message, and I guess we have the same issue when we are trying to read '''without order by''' clause
Solution: Every time we have ORDER BY we specify '''nulls first''' (this option is supported in PostgreSQL 8.3 and later)
