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Status Not under consideration
Workspace IBM i
Categories Db2 for i
Created by Guest
Created on Jan 9, 2023

Allow variable number of arguments on SQL CONCAT function

The current implementation of CONCAT only allows two parameters, for example CONCAT('hello', 'world') which makes concatenating multiple values cumbersome. This would for example result in CONCAT(CONCAT('hello', 'world'), 'again') for 3 strings.

It would be handy to write CONCAT('hello', 'world', 'again') which is easier to read and much shorter.

Idea priority High
  • Guest
    Mar 24, 2023
    IBM does not intend to provide the requested solution to this Idea at this time, so it is being closed.

    Since we have two forms of infix concatenation, we do not intend to extend the CONCAT scalar function to have more than 2 arguments.

    The infix double bar concat || poses problems with some CCSIDs, so we agree it should be avoided in most cases. Using the infix CONCAT keyword is the preferred choice for constructing strings from multiple values.
  • Guest
    Feb 9, 2023

    I'm aware that you can use the double pipe symbol, however this is a CCSID sensitive (ie; example 37 versus 500 ) character which I'd rather avoid as it often results in issues.

    Another solution would be that the + sign is just overloaded in SQL to concatenate strings.

  • Guest
    Feb 9, 2023
    IBM has received your Idea and is evaluating it. IBM will provide a response after evaluation is complete.

    Note that you can use CONCAT instead of || as an infix operator.
    'a' CONCAT 'b' CONCAT 12345

    Db2 for i development
    IBM Power Systems Development
  • Guest
    Jan 27, 2023

    I really like this one and think it would be extreamly useful if you have have a unlimited about of concatinations. This would be extreamly helpful if you are building up commands for the QCMDEXC scalar function!

  • Guest
    Jan 19, 2023

    Another way to concatenate is the usage of the double pipe ||. This is a shortcut that is the equivalent of using the concat function.

    For example, values 'hello' || 'world';

    or, values 'hello' || 'world' || 'again';

    I personally use the double pipe for concatenation over the concat function.