I have a query produced from several left joins which follows the format:

XXX ItemA NULL NULL
XXX ItemA ItemB NULL
XXX ItemA NULL ItemC

I need to group the data by all columns, column 0 is trivial, however columns
1:3 can collapse when any non null field matches. In the above case this could
collapse into a single line.

How can such a query be constructed?

Thanks,
jlc

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