Unlock a world of possibilities! Login now and discover the exclusive benefits awaiting you.
how do i use auto number to join two or more tables
It looks like you're trying to use autonumber function to create a single composite key between two tables. for the basic autonumber function you will want to join the relevant fields into a single string as the parameter. For example, if you wanted to use a user's name and job title it would be: autnumber([first]&[last]&[job title]). However there are times where data values could collide. I would recommend using autonumberhash128 or autonumberhash256 where you can pass each data field as an individual argument. Looking at the earlier example autonumberhash128([first], [last], [job title]). Notice these are separated arguments as opposed to concatenating the string.
An example of when this could be a problem is if you had two employees called kat evans and kate vans, the joined string would be katevans in both cases. You could also add some sort of delimiter to solve this, but I think the autnumberhash functions are more robust solutions for you.
Finally, don't forget to either qualify, rename, or exclude the fields used for the composite key so that Qlik doesn't try to join on both the composite key and the fields.
It looks like you're trying to use autonumber function to create a single composite key between two tables. for the basic autonumber function you will want to join the relevant fields into a single string as the parameter. For example, if you wanted to use a user's name and job title it would be: autnumber([first]&[last]&[job title]). However there are times where data values could collide. I would recommend using autonumberhash128 or autonumberhash256 where you can pass each data field as an individual argument. Looking at the earlier example autonumberhash128([first], [last], [job title]). Notice these are separated arguments as opposed to concatenating the string.
An example of when this could be a problem is if you had two employees called kat evans and kate vans, the joined string would be katevans in both cases. You could also add some sort of delimiter to solve this, but I think the autnumberhash functions are more robust solutions for you.
Finally, don't forget to either qualify, rename, or exclude the fields used for the composite key so that Qlik doesn't try to join on both the composite key and the fields.
Thank you so much for your assistance.
so for this example is it possible to use autonumberhash128 to link both tables
by creating a key.
Thanks in advance.
Lu
Travel:
load
point_from,
point_to
from Xyz.qvd;
coast:
load
point,
M_coast
From abc.qvd;
So this problem really doesn't lend itself to autonumberhash which is more designed for a situation where you making a composite key. I believe in this case you are looking to join both point_from and point_to. This is more akin to a canonical calendar where multiple fields are joined against a single calendar (in this case coast). I would suggest making an intermediate table that serves as a bridge between them.
Travel:
Load
rowno() as id
point_from,
point_to,
from xyz.qvd;
Travel_Map:
Load
id,
point_from as point,
'from' as travel_event
Resident Travel;
Concatenate Load
id,
point_to as point,
'to' as travel_event
Resident Travel;
coast:
load
point,
M_coast
From abc.qvd;
This should create a scenario where you select an M_coast and get all travel events that go to or from this location. Additionally, you can use the newly created travel_event field to specify if you want events that only went to or from a coast. This can be conceptually a bit challenging so feel free to reach out if you have any questions.