Data Management Puzzle

[#1]

I'm wondering how the Qlikview community would approach the following puzzle. I have a working solution, but it is not elegant by any means.

I have two tables outlined below, table1 and table2. I want to create a single table that looks like table3.

The field id is a made up identifier for this example. num only appears on table1. bnum only appears for colors equal to blue. The only color in table2 is blue. letter sometimes exist in table1, but then only for color equal red. letter exists for each record in table2.

Effectively, table3 should contain all records from table1, add records from table2, and fill in letter where it exists.

table1

id	num	bnum	color	letter
1	A		red
2	B		red	x
3	C	a	blue
4	C		red
5	D	b	blue

table2

id	num	bnum	color	letter
3		a	blue	y
5		b	blue	y
5		b	blue	z
6		c	blue	x

table3

id	num	bnum	color	letter
1	A		red
2	B		red	x
3	C	a	blue	y
4	C		red
5	D	b	blue	y
5	D	b	blue	z
6		c	blue	x

[patricio]

Here you have a way that should work.:

TempTable:
LOAD
     id,
     num,
     bnum,
     color,
     letter
FROM

(biff, embedded labels, table is Table1$);

Table2:
OUTER JOIN LOAD
     id ,
     num as num2,
     bnum as bnum2,
     color as color2,
     letter as letter2
FROM

(biff, embedded labels, table is Table2$);

Table3:
LOAD
id,
If (len(trim(num)) <> 0, num, num2) as num,
If (len(trim(bnum)) <> 0, bnum, bnum2) as bnum,
If (len(trim(color)) <> 0, color, color2) as color,
If (len(trim(letter)) <> 0, letter, letter2) as letter
Resident TempTable
;

Drop Table TempTable;