lookup function

Sat, 18 Jan 2014 13:13:32 GMT

can anyone explain lookup function

thanks in advance,

Re: lookup function

Sat, 18 Jan 2014 13:18:05 GMT

Hi,

See the doc I published on LOAD : http://community.qlik.com/docs/DOC-5698

There is a section on lookup and Applymap functions.

Fabrice

Re: lookup function

Gysbert_Wassenaar — Sat, 18 Jan 2014 13:38:23 GMT

See this document: Joins and Lookups

Re: lookup function

MK_QSL — Sat, 18 Jan 2014 15:39:06 GMT

You can search in QlikView Help File or QlikView Reference Manual for lookup function...

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.

Consider that you have Customer Table having customer information and Sales Table having customer name only.

You want to lookup customer id or customer country in sales table.

===============================================

Customer:

Load Text(ID) as ID, Name, Country Inline

[

ID, Name, Country

001, A, Germany

002, B, Italy

003, C, France

004, D, Poland

005, F, Spain

];

Sale:

Load *, Lookup('Country','Name', CustomerName, 'Customer') as Country Inline

[

CustomerName, Sale

A, 100

B, 200

C, 300

D, 260

E, 140

];

Drop Table Customer;

=============================

There are another function.... ApplyMap which is used and more fast than lookup but mapping table should have only two columns. One for reference and second as an end result.

Instead of ApplyMap and Lookup, you can join the table also, but sometimes for big database your application get slower and response time increased, so above two functions are handy.

Hope this help....

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