topic Re: Join two tables with a field! in QlikView

Join two tables with a field!

Thu, 16 Jun 2011 14:32:25 GMT

Hi All

May I know how can I join "Login" and "Calendar" table on LoginDate. Please help me out!

Load LoginDate, UserID, Application,'1' as Remark Resident Login1;

Calendar:

LOAD LoginDate,
     Year,
     Quarter,
     Month,
     Week

Resident table;

Re: Join two tables with a field!

Thu, 16 Jun 2011 14:57:43 GMT

use the sintaxe "JOIN" (INNER / OUTER/ LEFT / RIGHT)

Load LoginDate, UserID, Application,'1' as Remark Resident Login1;

Calendar:
INNER JOIN(Login)
LOAD LoginDate,
     Year,
     Quarter,
     Month,
     Week
Resident table;

Re: Join two tables with a field!

Thu, 16 Jun 2011 18:04:05 GMT

I think below script joins the Login and Calendar field with the common field 'LoginDate' between this two tables. Please correct me if I am wrong!

Load LoginDate, UserID, Application,'1' as Remark Resident Login1;

Calendar:
JOIN(Login)
LOAD LoginDate,
     Year,
     Quarter,
     Month,
     Week
Resident table;

Thanks

Attitude

Re: Join two tables with a field!

Thu, 16 Jun 2011 18:10:49 GMT

Yes, the field with some nema are the keys between tables.

If you have a compost key, you need to concatenate two or N filed in just a field.

Load LoginDate & UserID AS PK

, Application

,'1' as Remark

Resident Login1;

Calendar:
INNER JOIN(Login)
LOAD LoginDate & UserID AS PK
        , Year
        , Quarter
        , Month
        , Week
Resident table;

If you not indicate INNER before JOIN see in your example:

JOIN(Login)

The script assume the sintaxe OUTER.

OUTER JOIN (Login) = JOIN (Login)

Re: Join two tables with a field!

stevedark — Thu, 16 Jun 2011 18:43:14 GMT

From what I can see you do not need to join and your original script will 'associate' the two LoginDate fields as they have the same name. This should then behave as you want it to. Check the Table Viewer (Ctrl+T) to see if the association has been succesful (names need to be identical, case and all).

If all the calendar fields can be derived from the date you are better off working them out and not having a join at all, thusly:

Login: Load

date(LoginDate, 'DD MMM YYYY') as LoginDate,

Year(LoginDate) as Year,

'Q' & (ceil(Month(Date) / 3)) as Quarter,

Month(LoginDate) as Month,

week(LoginDate) as Week,

date(monthstart(Date), 'MMM-YY') as [Month Year],

UserID,

Application,

'1' as Remark

Resident Login1;

This should be much more effiecient - particularly when you get up to larger data volumes. The script assumes that the field LoginDate is a valid date field - otherwise you will need to nest a Date# function to convert it first.

- Steve