Top "Set-difference" questions

Trying to understand "except all" in sql query

I came across this example and I don't understand what it means. (SELECT drinker FROM Frequents) EXCEPT ALL (SELECT drinker …

sql intersect set-intersection set-difference set-operations

Python sets: difference() vs symmetric_difference()

What is the difference between difference() and symmetric_difference() methods in python sets?

python set-difference symmetric-difference

Find the set difference between two large arrays (matrices) in Python

I have two large 2-d arrays and I'd like to find their set difference taking their rows as elements. In …

python numpy set-difference

How to do sane "set-difference" in Ruby?

Demo (I expect result [3]): [1,2] - [1,2,3] => [] # Hmm [1,2,3] - [1,2] => [3] # I see a = [1,2].to_set => #<Set: {1, 2}> b = [1,2,3].to_…

ruby set-difference

How to get the difference of two maps based on the key set?

I have two maps: Map<String, Sample> newMap = convertJSONObjectToSampleMap(newMapStr); Map<String, Sample> oldMap = convertJSONObjectToSampleMap(oldMapStr); …

java collections map set-difference

Exclude characters from a character class

Is there a simple way to match all characters in a class except a certain set of them? For example …

regex set-difference character-class

Find String Array Difference in Java

I created two array variables: s1 and s2 s1 contains {ram,raju,seetha} s2 contains {ram} I want to subtract …

java arrays set-difference