"cond","and" and "or" in Scheme - Stack Overflow
Oct 14, 2013 · In addition to the answers that you get here, you might look at the answers to Why (apply and ' (1 2 3)) doesn't work while (and 1 2 3) works in R5RS? and Using AND with the …
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 …
How to group query with multiple $cond? - Stack Overflow
Jun 2, 2017 · I want to query like below, but this contains only one $cond. How to query with two $cond?
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 …
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 …
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
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 …
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.
c - When to use pthread condition variables? - Stack Overflow
pthread question: it appears that a condition variable only works if pthread_cond_wait is called before the other thread calls pthread_cond_notify. If notify somehow happens before wait then …