kdb+ and q
Q+A on all things kdb+ database and the q language
cancel
Showing results for 
Search instead for 
Did you mean: 

Forum Posts

table with dynamic columns

Hi,How do you create an empty table with columns defined pragmatically: c1, c2, c3, This function does not work because I can't figure out how to add a column. It's not interpreting column name. tbl:{[x] c:("c" ,/: (string (1+til x))); t:([] c1:"f"$(...

ZeroColon is awesome! but could still use some pointers on

I unfortunately discovered ZeroColon late! it would have saved me a lot of timeurl:"http://download.finance.yahoo.com/d/quotes.csv?s=FTR+CTL+LVLT+T+VZ&f=sr"a:.Q.hg`$urla1:"s,pe\n",at:("SS";enlist",")0:a1q)ts pe ----------FTR N/A CTL 14.43LVLT 5.58 T ...

ag1 by New Contributor
  • 714 Views
  • 2 replies
  • 0 kudos

Difference between single and batch upsert

Assuming I have just started the kdb server and its a clean state.The following command works fine and creates a table [INTENTION:batch insert] `trade8 upsert flip `col1`col2`col3!(1 2; 4389 4397; 2015.12.01T07:56:50 2015.12.01T07:56:58) The followin...

soum_guli by New Contributor
  • 825 Views
  • 2 replies
  • 0 kudos

if vs. $ (conditional)

p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 14.0px Menlo; color: #000000; background-color: #ffffff} span.s1 {font-variant-ligatures: no-common-ligatures} http://code.kx.com/wiki/Reference/DollarSign#cond/ what is the difference between using $ (con...

ag1 by New Contributor
  • 642 Views
  • 2 replies
  • 0 kudos