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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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Do full-outer-join with pandas.merge_asof

Hi I need to align some time series data with nearest timestamps, so I think pandas.merge_asof could be a good candidate. However, it does not have an option to set how='outer' like in the standard merge method. An example can be: df1: …
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SQL Full Outer Join duplicate Issue

I've been searching this over quite a bit, and I just can't see where I'm going wrong. I'm hoping someone can help me figure it out. I have two tables, one for all the Sales Orders (SO) for a part number, one for all the Purchase Orders (PO) for a…
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C# Linq full outer join on repetitive values

I have two IQueryable collections having this kind of type public class Property { public string Name {get; set;} } Collection 1, with the following Name values: A A A B Collection 2, with the following Name values: A B …
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only outer join python pandas

I have two DataFrames that have the same column names with some matching data and some unique data. I want to exclude the middle and only save what is unique to both DataFrames. How would I concat or merge or join these two dataframes to do so? For…
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SQL select merge two columns into one

I have four tables: Table A: ID | B_ID ---------- 1 | 5 2 | 6 3 | 7 4 | 8 Table B: B_ID ----- 5 6 7 8 Table C: C_ID | C_Name -------------- 5 | Alpha 6 | Beta Table D: D_ID | D_Name -------------- 7 | Delta 8 |…
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"TypeError: no implicit conversion of nil into String" when eager loading results

I'm using ruby '2.3.0' and 'rails', '3.2.22.2'. I need a little help & explanations about a query I've made. Here's my models: class AssessmentRaw < ActiveRecord::Base belongs_to :session has_many :schedulers, :class_name => 'MailingScheduler',…
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How to FULL OUTER JOIN multiple tables in MySQL

I need to FULL OUTER JOIN multiple tables. I know how to FULL OUTER JOIN two tables from here. But I have several tables, and I can't apply it over them. How can I achieve it? My SQL code, below: INSERT INTO table ( customer_id ,g01 ,g02 ,g03 …
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Replace returned null values in LEFT OUTER JOIN

SELECT WO_BreakerRail.ID, indRailType.RailType, indRailType.RailCode, WO_BreakerRail.CreatedPieces, WO_BreakerRail.OutsideSource, WO_BreakerRail.Charged, WO_BreakerRail.Rejected, WO_BreakerRail.RejectedToCrop, WO_BreakerRail.Date FROM …
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SQL (+)= definition and function

I would like to know what this statement in SQL actually does: select * from table where A (+)= B I ran it against: select * from table where A = B and saw the difference but do not know how to formulate an explanation as to what (+)='s…
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How to replace a complex SQL MINUS query with LEFT OUTER JOIN equivalent

Trying to figure how how to replace the following, with equivalent left outer join: select distinct(a.some_value) from table_a a, table_b b where a.id = b.a_id and b.some_id = 123 and b.create_date < '2014-01-01' and b.create_date >= '2013-12-01' …
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Select top one from left outer join

Guys, I have a query where basically select the latest browser that our user used. here is our (simplified) table structure HITS_TABLE ---------- USERID BROWSER HITSDATE USER_TABLE ---------- USERID USERNAME and here is how I query the latest…
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Do I misunderstand joins?

I'm trying to learn the the ansi-92 SQL standard, but I don't seem to understand it completely (I'm new to the ansi-89 standard as well and in databases in general). In my example, I have three tables kingdom -< family -< species (biology…
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What is the precedence of multiple JOIN statements in sqlite?

The following two queries are returning different results, to my surprise: SELECT * FROM foo JOIN bar ON bar.id=foo.bar_id JOIN baz ON baz.id=foo.baz_id LEFT JOIN zig ON…
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Joining two dataframes in pandas using full outer join

I've two dataframes in pandas as shown below. EmpID is a primary key in both dataframes. df_first = pd.DataFrame([[1, 'A',1000], [2, 'B',np.NaN],[3,np.NaN,3000],[4, 'D',8000],[5, 'E',6000]], columns=['EmpID', 'Name','Salary']) df_second =…
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How to fill missing values from merge(..., all = TRUE, ...) with a value other than NA?

In brief: I'm looking for a general way to fill the missing values in merge(..., all = TRUE, ...) with a constant other than NA. Suppose that z <- merge(x, y, all = TRUE, ...) ...and that I want all missing values in z (resulting from missing keys…
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