更新 KDB 表中的嵌套表列表

Question

我有下表，我正在尝试更新表的嵌套列表的空模式并在 t1 中使用结果填充它们

t:flip (`userName`nestedList)!(("user1";"user2";"user3";"user4");(flip (`col1`col2`col3`col4`col5`col6`col7)!(`symbol$();();();();();();());flip (`col1`col2`col3`col4`col5`col6`col7)!(enlist `XXX_XXX;enlist 0b;enlist 2000j;enlist -1j;enlist 1b;enlist 0b;enlist 0b);flip (`col1`col2`col3`col4`col5`col6`col7)!(`symbol$();();();();();();());flip (`col1`col2`col3`col4`col5`col6`col7)!(enlist `XXX_XXX;enlist 0b;enlist 2000j;enlist -1j;enlist 1b;enlist 0b;enlist 0b)))

期望的结果是 t1

t1:flip (`userName`nestedList)!(("user1";"user2";"user3";"user4");(flip (`col1`col2`col3`col4`col5`col6`col7)!(enlist `;enlist 0b;enlist 0;enlist 0;enlist 0b;enlist 0b;enlist 0b);flip (`col1`col2`col3`col4`col5`col6`col7)!(enlist `XXX_XXX;enlist 0b;enlist 2000j;enlist -1j;enlist 1b;enlist 0b;enlist 0b);flip (`col1`col2`col3`col4`col5`col6`col7)!(enlist `;enlist 0b;enlist 0;enlist 0;enlist 0b;enlist 0b;enlist 0b);flip (`col1`col2`col3`col4`col5`col6`col7)!(enlist `XXX_XXX;enlist 0b;enlist 2000j;enlist -1j;enlist 1b;enlist 0b;enlist 0b)))

//试图更新 t，所以下面运行的计数是 4 而不是 2

raze exec nestedList from t //count=2

raze exec nestedList from t1 //count=4

感谢您的帮助！

Answer 1

这是一种方法。

q)update nestedList:count[i]#enlist flip`col1`col2`col3`col4`col5`col6`col7!1#'(`;0b;0;0;0b;0b;0b)from t where userName in("user1";"user3")
userName nestedList
-----------------------------------------------------------------------------------
"user1"  +`col1`col2`col3`col4`col5`col6`col7!(,`;,0b;,0;,0;,0b;,0b;,0b)
"user2"  +`col1`col2`col3`col4`col5`col6`col7!(,`XXX_XXX;,0b;,2000;,-1;,1b;,0b;,0b)
"user3"  +`col1`col2`col3`col4`col5`col6`col7!(,`;,0b;,0;,0;,0b;,0b;,0b)
"user4"  +`col1`col2`col3`col4`col5`col6`col7!(,`XXX_XXX;,0b;,2000;,-1;,1b;,0b;,0b)
q)t1~update nestedList:count[i]#enlist flip`col1`col2`col3`col4`col5`col6`col7!1#'(`;0b;0;0;0b;0b;0b)from t where userName in("user1";"user3")
1b
q)count raze exec nestedList from update nestedList:count[i]#enlist flip`col1`col2`col3`col4`col5`col6`col7!1#'(`;0b;0;0;0b;0b;0b)from t where userName in("user1";"user3")
4

如果您需要 where 子句来考虑 nestedList 列，则可以使用

q)t1~update nestedList:count[i]#enlist flip`col1`col2`col3`col4`col5`col6`col7!1#'(`;0b;0;0;0b;0b;0b)from t where not count each nestedList
1b