Hi, I think I saw this question being asked before, but I can't remember
if their was a simple answer.
If I have a table of two columns (PK and FK) with a one to many
relationship, i.e.
PK FK
1 a
2 a
3 a
4 b
5 b
6 b
7 c
8 c
9 d
Can I easily select a truly random value of PK for each distinct value
of FK?
I use the words 'truly random' as I think the term 'pseudo random'
applies to the following syntax...
SELECT PK,FK FROM above_table GROUP BY FK;
Of course I can do...
SELECT MIN(PK),FK FROM above_table GROUP BY FK;
SELECT MAX(PK),FK FROM above_table GROUP BY FK;
But what I would really love to do is something like...
SELECT RANDOM(PK),FK FROM above_table GROUP BY FK;
Any general (and simple) SQL solution to this problem?
Any hacker out there who can put together a UDF in 10 minutes flat?
The problem is slightly more complex than stated, because PK is actually
a multi-part primary key. In my fevered imagination I picture syntax
that looks like this...
SELECT RANDOM(ROW(PK_P1,PK_P2)),FK FROM above_table GROUP BY FK;
but that could be a garbage suggestion.
Any pointers to previous answers to similar questions would be great.
All the best,
Dan.
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