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Coding Techniques Qlikview

Posted onFebruary 27, 2012byKulbir Minhas

This document covers couple of scenario, showing the power of Qlikview scripting and

way to achieve it

Some of sample coding techniques in Qlikview

1. Use of subfield

2. Pick and Match to replace if command

3. Dual Command Usage

4. Use of variable in variable in variable

5. Replacing IntervalMatch with Full Join

6. Optimization using Qlikview7. Set Analysis

8. Use of library

9. Others

10.Sorting Techniques for Pivot table

11.Showing the value for each Dimension (in Pivot table)

In this document, I will cover the first 5 points and remaining points and any additional

topics in separate document (Coding Techniques 2)

Sample Code

Subfield/Pick/Dual/Match

Data:

Load

Dual(RegionText, Match(RegionText,LN,TK,HK))as

Region,

Pick(Match(RegionText, LN,HK,TK),1.0,1.25, 1.50) as

Factor,

*;

LoadSubfield(LN,TK,HK,,)as

RegionText,

Ceil(Rand() * 100) as

Amount

AutoGenerate(100);

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The following example shows you how to use subfield to generate 3 fields from a single

value ->

Subfield(LN,TK,HK, ,) as RegionText,

Pick and Match to replace If condition, applicable only for equaltoexpression

Pick(Match(RegionText, LN, HK, TK, *), 1.0,1.25, 1.50,0.75) as Factor,

Use of Dual Command to assign Numeric value to Region (Generally used for regional

priority or Sorting)

Dual(RegionText, Match(RegionText,LN,TK,HK)) as Region,

Use of Dual Command to assign Numeric value to Region (Generally used for regional

priority or Sorting)

Use of variables:

The following 2 examples slightly different in approach are used in the attached qvwshowing the sum by region

Set 1 using AmountYTD, AmountQTD etc, which is predefined

Set 1:

Let

ReportType = WTD';// The values of variable can WTD, MTD, QTD, YTD

Let

AmountYTD = sum(if( CurrentYearFlag = 1, Amount))';

Let

AmountQTD = sum(if( CurrentQtrFlag = 1, Amount))';

Let

AmountMTD = sum(if( CurrentMonthFlag = 1, Amount))';

Let

AmountWTD = sum(if( CurrentWeekFlag = 1, Amount))';

Set 2 using FlagName and will be using this flag to find the values

Set 2:

Let

FlagName = Current& Pick(match(ReportType,WTD,MTD,QTD,YTD),Week,Month,Qtr,Year)& Flag';

The use of variables can be multiple levels, in Qlikview, the output of one variable can be

used as input to anothervariable

The good part is it can be used on either of equationas in case-1, it is used on LHS and

in case-2 it is used on RHS

Use of Peek/Previous and Interval Match

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Scenario

Table1: Records with Amount and TimeKey

Table2: Records with FxRate and TimeKey

Table 2 Does not have FxRate For all TimeKey, so assuming it has records for

TimeKey 1,7, 30 only

Then records

1-6 -> will use TimeKey = 1

7-29 -> will use TimeKey = 2

And 30 onwards will use TimeKey = 3

Example with Interval Match

Keys:

Load

Alt(Peek(KeyEnd),-1)+1 asKeyStart,

Key

as

KeyEnd,

FX;

Load

(Recno() 1 )* 10 + 1 as

Key,

Rand() as

FX

Autogenerate(10);

Concatenate(Key)

Load

KeyEnd+ 1 as

KeyStart,

1000 as

KeyEnd,FX

ResidentKey

where

KeyEnd= peek(KeyEnd,-1);

Data:

Load

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recno() as

Key,

Round(Rand()*100) as

Amount

Autogenerate(100);

IntervalMatch( Key)

Load

KeyStart,

KeyEnd

ResidentKeys;

Alternate Example with Left Join

Data:

Loadrecno() as

Key,

Round(Rand()*100) as

Amount

Autogenerate(100);

Key:

Load

Alt(Peek(KeyEnd),-1)+1 as

KeyStart,

Key

as

KeyEnd,

FX;

Load

(Recno() 1 )* 10 + 1 as

Key,

Rand() asFX

Autogenerate(10);

Concatenate(Key)

Load

KeyEnd+ 1 as

KeyStart,

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1000 as

KeyEnd

ResidentKey

where

KeyEnd= peek(KeyEnd,-1);

Left

Join(Data)

Load

*

ResidentKey;

Drop

TableKey;

DataNew:Load

Key,

Amount,

FX,

KeyStart

as

Start,

KeyEnd

as

End

ResidentData

Where

Key>= KeyStart

and

Key