Top "Outer-join" questions

An outer join defines a relationship between two tables where all records from one or both tables are returned regardless of the existence of a matching key-field in the other table.

Python pandas : Merge two tables without keys (Multiply 2 dataframes with broadcasting all elements; NxN dataframe)

I want to merge 2 dataframes with broadcast relationship: No common index, just want to find all pairs of the rows …

python pandas merge broadcast outer-join
Self join with inner and outer join query

I have a table that is set up so that one column (attribute) contains information like first name, last name, …

sql sql-server inner-join outer-join self-join
Left outer join - how to return a boolean for existence in the second table?

In PostgreSQL 9 on CentOS 6 there are 60000 records in pref_users table: # \d pref_users Table "public.pref_users" Column | Type | …

postgresql join left-join outer-join coalesce
data.table inner/outer join with NA in join column of type double bug?

Following this wikipedia article SQL join I wanted to have a clear view on how we could have joins with …

r inner-join data.table outer-join