Friday, May 20, 2016

Riddle 4: What’s Going On Here?

What’s happening in this snippet, and why is it interesting?
% q
KDB+ 3.3 2016.03.14 Copyright (C) 1993-2016 Kx Systems
m32/ 2()core 2048MB adavies air.local 10.37.129.2 NONEXPIRE

q)f:{x+1}
q)\d .foo
q.foo)g:{select f a from x}
q.foo)\d .
q).foo.g([]a:1 2 3)
a
-
2
3
4
q)

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4 Comments:

At May 20, 2016 at 3:27 PM , Blogger Dan Nugent said...

qSQL expressions always execute in the top level namespace.

 
At May 20, 2016 at 7:01 PM , Blogger Aaron Davies said...

Very close, but not quite right.

 
At May 22, 2016 at 4:23 AM , Blogger Akash said...

internally select gets converted into a functional format.And `a is treated as a constant and points to main namespace.

q)\d .foo
q.foo)x:{a+1}
q.foo)y:{value[`a]+1}
q.foo)a:1
q.foo)\d .
q)a:3
q).foo.x[]
2
q).foo.y[]
4
q)value .foo.x
0x0d81410003
,`x
`symbol$()
`foo`a
"{a+1}"
q)value .foo.y
0x0da033410003
,`x
`symbol$()
,`foo
`a
"{value[`a]+1}"

 
At September 26, 2019 at 12:38 PM , Blogger Osama Malik said...

Curiosity is an innate quality of childhood, and riddles help develop it and put it into practice. The child who listens to a riddle feels driven to discover his answer. The intonation, the musicality of this word game attracts you and invites you to discover and want to learn many more and for further info please visit this link https://elgforum.com/2019/09/8-benefits-of-playing-riddles.html

 

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