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Questions tagged [anti-join]

An anti-join, also called an excluding-join or left-outer-join, comes from requesting data from a table where some value is not in another table

Formal Definition

The antijoin, written as R ▷ S (where R and S are relations), is similar to the semijoin, but the result of an antijoin is only those tuples in R for which there is no tuple in S that is equal on their common attribute names.

Venn Diagram

anti-join

SQL Phrasing

SELECT <select_list>
FROM TableA A
LEFT JOIN TableB B
ON A.Key = B.Key
WHERE B.Key IS NULL

Related to

References:

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How to remove a word from a dataset in R? NLP

I'm very new in this world of programming. Ok so I am making an analysis of a text in R. I am using this to get rid of stop words: kant_palavras <- kant_palavras %>% anti_join(get_stopwords(language = 'pt')) BUT after, in the counting of words, the…
philosophy
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reverse table order in R fuzzy anti join match_fun

I am trying to run this code : main_df %>% fuzzy_anti_join(secondary_df, match_fun = list(`==`, `%within%`), by = c("ID","Date" = "Date_Interval")) the issue is that it returns the following error : Error in dplyr::group_by():…
marcelklib
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pyspark Anti-join 2 dataframes

I have 2 data frames df and df1. I want to filter out the records that are in df from df1 and I was thinking an anti-join can achieve this. But the id variable is different in 2 tables and I want to join the tables on multiple columns. Is there an…
Datamaniac
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How to get anti_join to work properly in data frame

I have data that looks like this conflict_ID country_code SideA 1 1 1 1 2 1 1 3 0 2 4 1 2 5 0 I used the…
craszer
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Returning Unique Responses from different data frames in R

I have three different data frames containing questions from a survey given over three years. Over the years some of the questions have been edited slightly. I would like to create a new data frame which tells me which questions have been changed…
beevis
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Quicker way? Remove rows in book1, take row 4 values as column name, set some column name same as book2

Below is the first dataframe where I want to remove the first 3 rows: book1 <- structure(list(Instructions..xyz = c("Note: abc", "", "Set1", "id", "632592651", "633322173", "634703802", "634927873",…
Catalyst
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Using Left Anti Join in SQL

I have a session table like (table1): session ID sender ID event date s1 s1 2020-10-02 s2 s1 2020-10-06 s3 s2 2020-03-01 s4 s2 2020-03-02 s5 s3 2020-08-02 s6 s4 2020-02-02 And a transactions table (table2)…
realkes
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Is there any objective reason to prefer a particular form of left anti-semi join?

I've seen a great many different forms of left anti-semi join. Allow me to list and name every one that comes to mind. The following queries are intended to return every ROSTER_ID that's not used by any employee and who is the owner of that…
J. Mini
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Joining a dataframe against a filtered version of itself

I have two dataframes, left and right. The latter, right, is a subset of left, such that left contains all the rows right does. I want to use right to remove redundant rows from left by doing a simple "left_anti" join. I've discovered that the join…
Matthew Hinea
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How to use anti_join with different levels of two variables?

I have been trying for hours and I can't figure it out. I have a data frame with subjects and conditions df1, from which I want to exclude observations which have a certain value (less than 3 in the variable "value" from df2. I cannot make it work…
Lili
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how to anti_join only if entire row is similar r

I have two data. frames, one which contains all transactions exported from an internal system (fullDF), and one that contains the transactions that have already been reviewed (reviewDF). Both DFs contain the same format, column headers, and were…
tycent10
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MySQL omitting rows a user has already seen from checking a "seen" table

I'm trying to figure out how best to write a statement that omits returning rows (maintable) that a user (uuid_user) has already seen (seentable). Q: Should I have the "seen" table be a separate table for each user? Currently, I have it as a…
ina
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MySQL for joining a table on uuid and omitting uuids present in both table

I'm trying to figure out how best to write a statement that omits returning rows (maintable) that a user (uuid_user) has already seen (seentable). Rows that a user has already seen are stored in seentable. Here is a simplified version of my tables.…
ina
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anti_join is not recognizing tidytext stop words in my dataset

I am working on removing stop words from a body of text with the tidytext approach in R. https://www.tidytextmining.com/tidytext.html The following example works: library(tidytext) library(dplyr) data(stop_words) str_v <- paste(c("i've been dancing…
Averysaurus
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how to find what is in data frame and not another in R

I have two data frames: codes and supply. Codes (shown below) is comprised of four fields: state,codetype,code,codetitle supply has 12 columns but three of them are state,codetype, and code An example of this is below state codetype code …
Tim Wilcox
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