Hello all : I want to show a duplicate value between three columns (1 Viewer)

[Matin_Murad]

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[CJ_London]

to what purpose? just to highlight them? delete them? move them around?

the data is not normalised so anything you do will involve more work.

but if you just want a list excluding duplicates use a union query

select mobile1 as mobile from myTable
union select mobile2 from myTable
union select mobile3 from myTable

this will automatically remove duplicates