topic Question about recursive use of left function. in QlikView

Question about recursive use of left function.

marcel_olmo — Sun, 19 Sep 2010 16:31:29 GMT

I'll show you what I'm trying to do :

This is an image of my desired result :

Here you can find the two key fields : N_Fila and N_Fila_Cuenta.

N_Fila_Cuenta is the important one, because I want to divide all the numbers of this field in "levels" like I've shown you before in the picture.

By now, I'm doing it in a static way, wich means I use the left() function to get the desired results because I know exactly that the last level will be level 7.

This is how I'm doin it now :

Cuentas_Mayor8:

load
N as N_Fila,
N2 as N_Fila_Cuenta,

left(N2,1) as "IDCuentaNivel1",
left(N2,2) as "IDCuentaNivel2",
left(N2,3) as "IDCuentaNivel3",
left(N2,4) as "IDCuentaNivel4",
left(N2,5) as "IDCuentaNivel5",
left(N2,6) as "IDCuentaNivel6",
left(N2,7) as "IDCuentaNivel7"

resident Cuentas_Mayor7;

But in the future I won't know how many numbers will have the field "N_Fila_Cuenta", which means I won't know how many levels I'll have.

Anybody has an idea how to that in a dynamic way? I appreciate any kind of help.

Thanks in advance.

Regards.

Question about recursive use of left function.

Anonymous — Sun, 19 Sep 2010 17:25:22 GMT

If the lenftgh of all values is the same, the next script can be used (or similar to this):


Cuentas_Mayor7: // this is just for illustration
load * inline [
 N, N2
 10, 6030001
 10, 6030002];

// Example starts here
LET L = len(peek('N2')); // define length
//
NOCONCATENATE
Cuentas_Mayor8:
LOAD
 N,
 N2
resident Cuentas_Mayor7;
//
for l = 1 to $(L)
 JOIN (Cuentas_Mayor8) LOAD
 N,
 N2,
 left(N2,$(l)) as IDCuentaNivel$(l)
 RESIDENT Cuentas_Mayor7;
next
//
DROP TABLE Cuentas_Mayor7;

Question about recursive use of left function.

marcel_olmo — Sun, 19 Sep 2010 21:02:28 GMT

Thanks Michael. Your post was very helpful.

I didn't know that you can loop a recently loaded table like this.

That was exactly what I was looking for.

Thank you and see you around!!