Stream: cql
Topic: CQL Language Questions
Eric Whitley (Mar 16 2020 at 21:50):
Hello -
Really naive question.
I'm implementing a variant of a measure where I need to do something like this:
(
//if we have one or more elements, then increment by 1
if (count of elements in list A > 0)
then 1
else 0
)
+ (count of elements in list B)
I'm struggling with how to approach the idea of doing the "if" section. I suspect I'm probably missing something obvious.
Is there an equivalent way of saying "my list is empty, so return 0 vs. my list has values, so return 1" ?
Any ideas very much appreciated.
Thank you,
Eric
Lloyd McKenzie (Mar 16 2020 at 23:05):
@Bryn Rhodes
Bryn Rhodes (Mar 16 2020 at 23:22):
Something like this?
define List1: { 1, 2, 3 }
define List2: { }
define ListExistsCount:
if exists(List1) then 1 else 0
+ if exists(List2) then 1 else 0
Eric Whitley (Mar 17 2020 at 14:06):
Wow, thanks @Bryn Rhodes . I totally missed that. Thanks for that - you tipped me off to the "logical specification" documentation. https://cql.hl7.org/04-logicalspecification.html#if
Last updated: Apr 12 2022 at 19:14 UTC
