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Would it be possible to explain the difference between the concat() function and the || operator in Oracle?
Which one is better in terms of performance?
There is no functional difference.
||is the ANSI standard string concatenation operator (though, unfortunately, not every database<cough>SQL Server</cough>chooses to support the standard). Many databases support aCONCATfunction so it may be easier to port code usingCONCATto different databases.