Yesterday I voted on the poll by @SQL Daily about using different forms for “not equals” conditions and that brought back bad (and funny) memories. Over 25 years I have always used “!=”. “Does it matter”, you might ask? Actually, it shouldn’t. But here is my story and the reason, why I was considering to change my habits and use “<>”.
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The preview version of Oracle 20c is now available in the cloud and I got the chance to test some new features there. I start with SQL macros, a feature that I think could well become a kind of game changer: let’s just look at the long-awaited parameterized views.
Continue readingActually, the CBO usually does a good job optimizing “NOT IN” subqueries. Unless something goes wrong. Recently it took a long time on a 10.2.0.5 database to search for the reason. At last looking in the CBO trace files (event 10053) has given the right hint.
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