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Questions tagged [outer-join]

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. A full outer join combines the results of both tables. A left or right join returns all the records from the first or second specified table, respectively. NULLS are filled in for matches on either side. A self-join compares a table to a copy of itself.

A full combines the results of both tables. A left or right returns all the records from the first or second specified table, respectively. NULLS are filled in for matches on either side. A compares a table to a copy of itself.

References

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pandas: how to aggregate two list columns when joining data frames

I have the following two data frames: id websites -- --- 0 1 [cnn.com, bbc.com] 1 2 [ebay.com, facebook.com] ________________ id websites -- --- 0 2 [google.com, facebook.com] 1 3 [amazon.com, youtube.com] I…
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Bigquery Full Join ON multiple conditions

I want to perform a Full Outer join on two tables with multiple conditions to result all the matching records along with unmatched records from both tables. Tbl1 is a bigger table with 21 M records and Tbl2 has 5k rows, like the example query below.…
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How to do a partitioned outer join in BigQuery

I would like to implement the partitioned outer join in BigQuery. To give a concrete example, I'd like to achieve the partitioned outer join as the accepted answer here:…
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Is there a join in sql that will fill in missing data of one table to the other?

I want to fill in dates that are missing from one table from the dates table that I created. The first table where i have all the dates is this one: Dates 01/11/2018 02/11/2018 03/11/2018 The second table with my data is this one: Name Value …
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How to get D1 D7 D30 without left join on the same table

Objective: I would like to know everyone who signed up on Day 0, how many of them logged in after D1, after D7 and after D30. I would like to make a table valued function where the users inserts a date and gets results for D0, D1, D7, D30. Results…
Roger Steinberg
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Is it true that using INNER JOIN after any OUTER JOIN will essentially invalidate the effects of OUTER JOIN?

In other words, for a nested/multiple JOIN SQL statement, is it safe to say that one should always use INNER JOIN first (either put it at the top line or by using parentheses to first INNER JOIN two tables) and make sure it precedes any OUTER JOIN…
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SQL - OUTER JOIN a UNION-ed tables

I am new to sql. I have three tables, I want to UNION the first two tables then OUTER JOIN the result with the third table and only selecting a desired date. I have already done the UNION but I don't know how the OUTER JOIN will come in. These are…
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SQL Server Conditional Joins

I've three tables Table1 Table2 Table3. I've to perform some operations on them and store the resultant in Table4 Table1: ID t1col2 t1col3 `````` `````` `````` 123 Fname1 Lname1 456 Fname2 Lname2 789 …
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SQL left join with filter in JOIN condition vs filter in WHERE clause

I'm refactoring some sql at work, and stumbled on something I'm not sure how to explain. There are two queries I thought would result in the same result, but don't, and I'm not sure why. The queries are as follows: select * from TableA as a left…
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Left Join, Order by, MySQL Optimization

I have a query like this: SELECT m...., a...., r.... FROM 0_member AS m LEFT JOIN 0_area AS a ON a.user_id = (SELECT user_id FROM `0_area` …
Jeremy Roy
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I want to do join query from 2 different table and i want output from both table

I apply LEFT JOIN and RIGHT JOIN query to get output from both table.. There is two table : 1st table for Product_list.. This table contain category_id which is foreign key and all other product detail.. 2nd table for product_images.. This…
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SQL Server : display distinct list of orders, and indicate which orders contain specific products

I have a table that contains a lot of data, but the relevant data in the table looks something like this: Orders table: +----------+-----------+---------------+ | OrderID | Product | Date | +----------+-----------+---------------+ | 1…
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Python: Taking a the outer product of each row of matrix by itself, taking the sum then returning a vector of sums

Say I have a matrix A of dimension N by M. I wish to return an N dimensional vector V where the nth element is the double sum of all pairwise product of the entries in the nth row of A. In loops, I guess I could do: V = np.zeros(A.shape[0]) for n…
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data.table dplyr full_join equivalent modify in place

I recently discovered data.table and I love its ability to modify values in place, because I am usually working with datasets sized around 10-15GB. While I was able to do a left/right join with modification in place, I could not find a solution how…
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Hibernate LEFT OUTER JOIN with DetachedCriteria

I am trying to transform the following SQL into Hibernate DetachedCriteria: SELECT students0_.courseId AS courseId2_1_, students0_.studentId AS studentId1_, student1_.id AS id3_0_, student1_.href AS href3_0_, student1_.created AS…
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