Recent questions tagged kdb

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kdb - most performant way to get asof price given a list of timestamps

I have a list of timestamps spanning multiple dates ( no sym, just timestamps). These can be 1000/2000 at times, ... -performant-way-to-get-asof-price-given-a-list-of-timestamps...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kdb - FK field over IPC

Some prerequisites on the remote process: q)p 15222 q)t:([id:10 20 30]data:`aa`bb`cc); q)kt:([] ... 11h question from:https://stackoverflow.com/questions/65881891/fk-field-over-ipc...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kdb - Why does not work select from a keyed table

A query result looks good if I break keyed table apart into key-value pair and combine them together: key!value. ... /questions/65941099/why-does-not-work-select-from-a-keyed-table...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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516 views

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kdb - Getting a sublist using regex

I have a list as such: myList: ("ab";"bc";"cd","de"); I would like to get a sublist ... question from:https://stackoverflow.com/questions/66056899/getting-a-sublist-using-regex...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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532 views

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kdb - Getting a sublist using regex

I have a list as such: myList: ("ab";"bc";"cd","de"); I would like to get a sublist ... question from:https://stackoverflow.com/questions/66056899/getting-a-sublist-using-regex...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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499 views

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kdb - problem building an expression dynamically

I'm trying to build a generic query, where I would not know the name and number of columns of a table. ... anyone could please give me some pointers, would be greatly appreciated....

asked Feb 19, 2021 in Technique[技术] by 深蓝 (71.8m points)

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kdb - Given 2 vectors A and B Concatenate each element of A with each element of B So for example if A: 0 1 2 B: 3 4 5 be (0 3;1 4; 2 5)

Given 2 vectors A and B; Concatenate each element of A with each element of B. So for example if A: 0 1 2 B: 3 4 5 then the output should be (0 3;1 4; 2 5)...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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