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Discussion Board for collaboration related to QlikView App Development.
can someone please help in explaining applymap functionwith example,why we use it,how it works,
The MAPPING statement provides an alternative to the JOIN statement in a very specific scenario: when you want to replace a single key value with a value from a lookup (mapping) table.
We prefix ' Mapping' to the load statement to tell Qlikview that a table is a mapping table.
The mapping table is called with the 'Applymap()' function
LOAD * Inline
Drop table MapTable;
whats the result of the above statement?
PFA to observe the result produced by apply Map.
it's very similar to the V.LOOKUP function in excel.
For example if you have two tables like this in your database:
a001, first code
a002, second code
you can join them using Code but if you create a table like this:
Code, Quantity, Description
a001, 100, first code
a002, 50, second code
a003, 70, -
but you get a null value in the description field... and you can't select it
if you use applymap you can put a value in the description field:
mapping load Code, Description resident Products;
Applymap('map_description, Code, 'not found') as Decription.
applymap is far better.. in this case you can drop the Product table and your database is simpler and less CPU expensive...
In this way you can select "not found" values without any problem.
The only problem of applymap comes when your mapping table isn't indexed.
If you have a situation like this:
a002, third code
if you have duplicate values applymap put the first one. Joins are better in this case because the error is visible early.