From the help screen
lookup( fieldname, matchfieldname, matchfieldvalue [, tablename] )
Returns the value of fieldname corresponding to the first occurrence of the value matchfieldvalue in the field matchfieldname.Fieldname, matchfieldname and tablename must be given as strings (e.g. quoted literals).
The search order is load order unless the table is the result of complex operations such as joins, in which case the order is not well defined.
Both fieldname and matchfieldname must be fields in the same table, specified by tablename. If tablename is omitted the current table is assumed.
If no match is found, null is returned.
Example:
lookup('Price',
'ProductID', InvoicedProd, 'pricelist')
I occasionally have issues using this function - mainly as I try to avoid it anyway. Couple of things from trial and error:
- The field names with the ' ' literal wrapper. DO NOT wrap them with [ ] inside the ' ' even if the field usually needs them. It will confuse Qlikview and won't find your match.
- As it says, should always use the tablename, as usually not trying to use the current table name.
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