"cond","and" and "or" in Scheme - Stack Overflow
Oct 14, 2013 · You cannot define cond or and or or or if as functions because functions evaluate all their arguments. (You could define some of them as macros). Read also the famous SICP …
mongoose aggregate using $exists in $cond - Stack Overflow
Jan 9, 2017 · I want to $project if a field exists, but not it's value, using mongoose model aggregate query. If it was possible using $exists in $cond, it would have looked ...
Use of $COND and $EQ with a array of objects - Stack Overflow
Mar 1, 2014 · I'm hoping that someone might be able to answer whether what I'm trying to accomplish below can be done with the MongoDB Aggregation Framework. I have a user data …
How to group query with multiple $cond? - Stack Overflow
Jun 2, 2017 · 35 I want to query like below, but this contains only one $cond. How to query with two $cond?
understanding of pthread_cond_wait() and pthread_cond_signal()
Jan 3, 2024 · But there is a saying "The pthread_cond_signal () function shall unblock at least one of the threads that are blocked on the specified condition variable cond (if any threads are …
How to use $in or $nin in mongo aggregation $group $cond
Nov 16, 2015 · How to use $in or $nin in mongo aggregation $group $cond Asked 10 years ago Modified 10 years ago Viewed 21k times
What is the difference between if and cond? - Stack Overflow
Nov 15, 2020 · As of #2240 (merged 2 Mar 2022), if and cond are somewhat different from what they used to be, and are better distinguished from each other. if requires exactly three …
Conditional grouping with $exists inside $cond - Stack Overflow
1 I found your questions while looking for a similar problem, but insted of a key, I was looking for my parameters. I finally solved the issue. This is what I used for my parameter, to check that if …
MongoDB conditional if else if with exists - Stack Overflow
Feb 21, 2022 · if user id exists then user id else if user name exists then user name else if user email exists then user email else '' Here, is my code.
Is there an elseif thing in MongoDB to $cond while aggregating
Dec 15, 2014 · The if..then..else keywords to the $cond operator are only a recent addition as of recent versions of MongoDB at the time of writing ( MongoDB 2.6 was the introduction of the …