Comments - Moving from Oracle to MariaDB
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Why do you need a subquery?
At this stage we are looking at porting from Oracle to MariaDB, instead of re-designing the application. Existing programs which are running on Oracle are having such queries, hence testing the same on MariaDB also.
Sorry but this does not make sense. The initial query does not need a subquery. Please post a real query from your application.
I guess that moving from Oracle to MariaDB you'll have to rewrite some queries as the SQL subset is not 100% similar.