outer-join

Difference between SAS merge and full outer join [duplicate]

由 試著忘記壹切 提交于 2019-12-08 08:26:30
问题 This question already has answers here : How to replicate a SAS merge (2 answers) Closed 4 years ago . Table t1: person | visit | code_num1 | code_desc1 1 1 100 OTD 1 2 101 SED 2 3 102 CHM 3 4 103 OTD 3 4 103 OTD 4 5 101 SED Table t2: person | visit | code_num2 | code_desc2 1 1 104 DME 1 6 104 DME 3 4 103 OTD 3 4 103 OTD 3 7 103 OTD 4 5 104 DME I have the following SAS code that merges the two tables t1 and t2 by person and visit: DATA t3; MERGE t1 t2; BY person visit; RUN; Which produces the

SQL Merge 3 tables by date where some dates are missing

由 扶醉桌前 提交于 2019-12-08 06:45:37
问题 I have 3 tables that I want to merge, each with a different column of interest. I also have an id variable that I want to do separate merges "within" id. The idea is that I want to merge X, Y, and Z by date (within ID), and have missing values if that date does not exist for a particular variable. Table X: ID Date X 1 2012-01-01 101 1 2012-01-02 102 1 2012-01-03 103 1 2012-01-04 104 1 2012-01-05 105 2 2012-01-01 150 Table Y: ID Date Y 1 2012-01-01 301 1 2012-01-02 302 1 2012-01-03 303 1 2012

How to get frequency count of date based on condition in R?

由 丶灬走出姿态 提交于 2019-12-08 05:42:27
问题 Below is my scenerio. Scenerio I have two dataframe. 1st dataframe contains data about system usage and another dataframe contains data about System location. I would like to track instrument usage based on date the system was used and also the location where the instrument is located. For this I am performing outer join on dataframes using dplyr library. Next, I would like to get frequency count of the systems based on date. For this I am using groupby on System and Locations. If the system

Optimize MySQL Full outer join for massive amount of data

由 ⅰ亾dé卋堺 提交于 2019-12-07 13:21:18
问题 We have the following mysql tables (simplified for going straight to the point) CREATE TABLE `MONTH_RAW_EVENTS` ( `idEvent` int(11) unsigned NOT NULL, `city` varchar(45) NOT NULL, `country` varchar(45) NOT NULL, `ts` datetime NOT NULL, `idClient` varchar(45) NOT NULL, `event_category` varchar(45) NOT NULL, ... bunch of other fields PRIMARY KEY (`idEvent`), KEY `idx_city` (`city`), KEY `idx_country` (`country`), KEY `idClient` (`idClient`), ) ENGINE=InnoDB; CREATE TABLE `compilation_table` (

How to do Outer Join on >2 Tables (Oracle)

由 你离开我真会死。 提交于 2019-12-07 01:24:37
问题 I'm not sure how to describe my table structure, so hope this makes sense... I have 3 tables in hierarchical relationship such that A has a one to many relationship to B which in turn has a one to many relationship with C. The trick is that the foreign key in B and C are allowed to be null (i.e. no parent defined). I also have D and E with no relation to A, B or C (directly). Finally, I have F which is a join table with many to one relationships with C, D and E. None of its fields (FKs to the

Left Outer Join not returning all records from primary table

由 狂风中的少年 提交于 2019-12-06 22:20:15
问题 When I do a left outer join, I expect to get all the records that the query would return prior to adding the joined table, but it is only returning records that match the joined table (i.e: no record for '092387' exists in table 'documentation', so I just want null returned for 'filename' field for that record.) What am I doing wrong? mysql> select documentation_reference.ref_docnumber , documentation.filename from documentation_reference left outer join documentation on ref_docnumber

Optimize MySQL Full outer join for massive amount of data

由 眉间皱痕 提交于 2019-12-05 23:59:07
We have the following mysql tables (simplified for going straight to the point) CREATE TABLE `MONTH_RAW_EVENTS` ( `idEvent` int(11) unsigned NOT NULL, `city` varchar(45) NOT NULL, `country` varchar(45) NOT NULL, `ts` datetime NOT NULL, `idClient` varchar(45) NOT NULL, `event_category` varchar(45) NOT NULL, ... bunch of other fields PRIMARY KEY (`idEvent`), KEY `idx_city` (`city`), KEY `idx_country` (`country`), KEY `idClient` (`idClient`), ) ENGINE=InnoDB; CREATE TABLE `compilation_table` ( `idClient` int(11) unsigned DEFAULT NULL, `city` varchar(200) DEFAULT NULL, `month` int(2) DEFAULT NULL,

'LEFT JOIN' vs 'LEFT OUTER JOIN'

由 最后都变了- 提交于 2019-12-05 18:23:15
I know there is really no difference, but is 'LEFT JOIN' an ANSI form or are there any RDBMS's that will fail 'LEFT JOIN' and require 'LEFT OUTER JOIN'. [I am asking here so I can save a few clicks, form fillings, etc to get the correct ANSI standard!] [OUTER] is optional, per the ANSI spec ( 92 , but I'm sure later versions also cover it). Of course, you're assuming that every SQL product is ANSI compatible. For joins, they probably are.. ANSI JOINS http://www.oratechinfo.co.uk/ansi_joins.html Note, the OUTER can be dropped, since, by definition, LEFT, RIGHT and FULL JOINs MUST be OUTER joins

Canonical outer join zip function

由 南笙酒味 提交于 2019-12-05 06:59:11
If you consider the (implicit) indexes of each element of a list as their keys, then zipWith is sort of like a relational inner join. It only processes the keys for which both inputs have values: zipWith (+) [1..5] [10..20] == zipWith (+) [1..11] [10..14] == [11,13,15,17,19] Is there a canonical corresponding function corresponding to outer join? Something like: outerZipWith :: (a -> b -> c) -> a -> b -> [a] -> [b] -> [c] outerZipWith _ _ _ [] [] = [] outerZipWith f a' b' [] (b:bs) = f a' b : outerZipWith f a' b' [] bs outerZipWith f a' b' (a:as) [] = f a b' : outerZipWith f a' b' as []

How to do Outer Join on >2 Tables (Oracle)

由 前提是你 提交于 2019-12-05 05:29:47
I'm not sure how to describe my table structure, so hope this makes sense... I have 3 tables in hierarchical relationship such that A has a one to many relationship to B which in turn has a one to many relationship with C. The trick is that the foreign key in B and C are allowed to be null (i.e. no parent defined). I also have D and E with no relation to A, B or C (directly). Finally, I have F which is a join table with many to one relationships with C, D and E. None of its fields (FKs to the other tables) are nullable. I would like to write a SQL statement that joins all the tables in a
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