topic Computing Age across tables in QlikView

Computing Age across tables

dwfiv327 — Wed, 24 Feb 2016 15:35:20 GMT

I have two tables, one with personal information, like data of birth. And another table with transaction date. They can be joined via a Cust_ID. Is there a way, during the load process to computer the difference in these two dates for a customer for all of her or his corresponding transactions?

In other words, I want the age of a person at the time of the transaction, but the two dates are in different tables and doing the age calculation at the time of displaying the chart is unacceptably slow.

Any help would be greatly appreciated.

-Daniel

Re: Computing Age across tables

m_woolf — Wed, 24 Feb 2016 17:18:57 GMT

If you join load the two tables, you will get a single table. Then you can calculate the date differences.

Re: Computing Age across tables

dwfiv327 — Wed, 24 Feb 2016 17:32:40 GMT

Didn’t work. Here is a snippet of my code. What it gets to the line with ContactAge, I get an error message about not finding birthday.

LOAD CustomerID,

Birthday,

age(today(),Birthday) as CustAge,

Year(Birthday) as BirthYear,

date(Birthday) as dob,

IDType2;

SQL SELECT *

FROM PersonalInfo;

Inner Join

LOAD SessionID,

CustomerID,

date(SessionDate) as SessDate,

age(SessionDate, Birthday) as ContactAge,

Reason;

SQL SELECT *

FROM Session;

Daniel W. Farrow, IV

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Re: Computing Age across tables

m_woolf — Wed, 24 Feb 2016 18:56:17 GMT

Try just joining the 2 tables.

Look at the resulting single table. I suspect that you can't calculate the age until after the tables are joined.

Re: Computing Age across tables

MarcoWedel — Wed, 24 Feb 2016 22:52:21 GMT

Hi,

one solution could be:

tabPersonalInfo:
LOAD RecNo() as CustomerID,
     Date(MakeDate(1950)+Ceil(10000*Rand())) as Birthday
AutoGenerate 10;

tabSession:
LOAD RecNo() as SessionID,
     Ceil(Rand()*10) as CustomerID,
     Date(Today()-Ceil(Rand()*5000)) as SessionDate
AutoGenerate 50;

Left Join (tabSession)
LOAD CustomerID,
     Birthday
Resident tabPersonalInfo;

Left Join (tabSession)
LOAD Distinct
     Birthday,
     SessionDate,
     Age(SessionDate,Birthday) as ContactAge
Resident tabSession;

DROP Field Birthday From tabSession;

hope this helps

regards

Marco

Re: Computing Age across tables

MarcoWedel — Wed, 24 Feb 2016 23:00:32 GMT

another possible solution might be:

tabPersonalInfo:
LOAD RecNo() as CustomerID,
    Date(MakeDate(1950)+Ceil(10000*Rand())) as Birthday
AutoGenerate 10;

mapPersBirthday:
Mapping LOAD * Resident tabPersonalInfo;

tabSession:
LOAD *,
    Age(SessionDate,ApplyMap('mapPersBirthday',CustomerID)) as ContactAge;
LOAD RecNo() as SessionID,
    Ceil(Rand()*10) as CustomerID,
    Date(Today()-Ceil(Rand()*5000)) as SessionDate
AutoGenerate 50;

hope this helps

regards

Marco