topic complex apply map table in QlikView

complex apply map table

Thu, 11 Sep 2014 08:45:10 GMT

Hi everyone,

I have a set of rules that I want to apply from a mapping table. The table looks like the below one:

MappingValues	Rule1	Rule2	Rule3	Rule4
Value1	R1MappingKey			R4MappingKey
Value1		R2MappingKey		R4MappingKey
Value1			R3MappingKey
Value1	R1MappingKey
Value2,		R2MappingKey
Value2,			R3MappingKey
Value1,	R1MappingKey
Value3,			R3MappingKey
Value3	R1MappingKey
Value4		R2MappingKey	R3MappingKey
Value4				R4MappingKey
etc

So I was thinking I would split the big mapping table in 4 smaller tables and thed do the mapping.

But the issue is that each rule has to be hierarchicaly applied from top to bottom. So Value1>Value2>Value3>Value4 rules

In addtion when one mapping rule is applied in a row the others rules on the same row should be ignored adn when the first rle applied for each mapping key is only the valid one. For example if Row1 R1MappingKey does exist in other rows after first row is applied the oders should be ignored.

Any ideas on how to solve this puzzle?

P.S i can not submit or open any qvw for security reasons.

Re: complex apply map table

Thu, 11 Sep 2014 08:56:11 GMT

Is the order displayed here (Rule1, Rule2) the order of priority? E.g. if a value has an entry in Rule2 and Rule4 you would want the mapping to display the entry in Rule2?

I would load the data into 1 mapping table with 4 subsequent loads:

MappingTable:

LOAD MappingValues, Rule1 As Rule

FROM RuleTable

WHERE Not Isnull(Rule1)

LOAD MappingValues, Rule2 As Rule

FROM RuleTable

WHERE Not Isnull(Rule2)

AND NOT EXISTS (Rule)

LOAD MappingValues, Rule3 As Rule

FROM RuleTable

WHERE Not Isnull(Rule3)

AND NOT EXISTS (Rule)

etc

Re: complex apply map table

Thu, 11 Sep 2014 09:02:06 GMT

Hi Dick,

Yes if there is an entry in Rule2 and Rule4 I would want only the rule 2 to be mapped.

The issue with you implemetation is that R1MappingKey ext can be group of values sometimes and maybe subtotal of another R*MappingKey.

Re: complex apply map table

rubenmarin — Thu, 11 Sep 2014 09:06:42 GMT

Hi kavros

There is a 3 parameter version of applymap, the 3rd parameter is when the key is not found:

ApplyMap('MapRule1', Key, ApplyMap('MapRule2', Key, ApplyMap('MapRule3', Key, ApplyMap('MapRule4', Key))));

Hope this helps.

Re: complex apply map table

Thu, 11 Sep 2014 09:31:52 GMT

Thanks for the help. I already tried that.

The problem is that the rules have to be applied in a top to bottom order as per row per row.

So what could potentialy be a solution is tho have each row as a seperate mapping table.

Re: complex apply map table

senpradip007 — Thu, 11 Sep 2014 09:42:09 GMT

As per my understanding you may try like

Mapping LOAD

MappingValues&'-'& If(Len(Rule1)<>0,Left(Rule1,2), If(Len(Rule2)<>0, Left(Rule2,2), If(Len(Rule3)<>0, Left(Rule3,2), Left(Rule4,2) ))) AS Key,

Inline [

MappingValues, Rule1, Rule2, Rule3, Rule4

Value1, R1MappingKey, '', '', R4MappingKey

Value1, '', R2MappingKey, '', R4MappingKey

Value1, '', '', R3MappingKey, ''

Value1, R1MappingKey, '', '', ''

Value2, '', R2MappingKey, '', ''

Value2, '', '', R3MappingKey, ''

Value1, R1MappingKey, '', '', ''

Value3, '', '', R3MappingKey, ''

Value3, R1MappingKey, '', '', ''

Value4, '', R2MappingKey, R3MappingKey, ''

Value4, '', '', '', R4MappingKey

];

Re: complex apply map table

Thu, 11 Sep 2014 10:30:44 GMT

But still this does not resolve the issue with the hierarchy of which you apply the rules. as this key-value mapping wont apply the maping row by row on a top to bottom basis. In addition if I use the key for mapping I could end up with duplicates.

Re: complex apply map table

vikasmahajan — Thu, 11 Sep 2014 10:52:35 GMT

This scenario can be handle in script it self in back end.

Vikas

Re: complex apply map table

Thu, 11 Sep 2014 11:16:30 GMT

I am not sure what you mean exactly.

Taking as an example the inline table above from Pradivs code. In the case of R1Mapping Key I will have 2 Values to map to. But I only want to take the Value1 into account.

Key	MappingValues	Rule1	Rule2	Rule3	Rule4
Value1-R1	Value1	R1MappingKey
Value3-R1	Value3	R1MappingKey