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Unique Values In Column

DZone's Guide to

Unique Values In Column

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//Find out if a value is unique in a column.



select count(debiteurennummer) as aantal, debiteurennummer from vestiging group by debiteurennummer order by aantal desc

Replace debiteurennummer by naam... hoe vaak is mijn relatienaam uniek?

en natuurlijk ook personeelsnummer in persoon.
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