full-outer-join

MySQL FULL JOIN not working but RIGHT and LEFT join works

由 寵の児 提交于 2019-11-28 03:11:59
问题 This is driving me nuts. I have two tables that I am attempting to preform a join on, usersXstats and usersXstats_alltime. Both tables have the same columns: id, userId, statId, and value What I am trying to do is SELECT * FROM usersXstats FULL JOIN usersXstats_alltime ON usersXstats.userId=usersXstats_alltime.userId AND usersXstats.statId=usersXstats_alltime.statId However this is returning Unknown column 'usersXstats.userId' in 'on clause' This query works just as expected when replacing

Simulate FULL OUTER JOIN with Access on more than two tables

由 旧巷老猫 提交于 2019-11-27 19:32:50
问题 I learned the hard way that Access does not allow you to do full outer joins, and while reading on how to simulate one, I have begun to understand how to do so, but am having issues trying to apply this to more than just two tables. Is it as simple as doing the following? SELECT * FROM table1 LEFT JOIN table2 ON table1.field = table2.field LEFT JOIN table3 ON table1.field = table3.field UNION SELECT * FROM table1 RIGHT JOIN table2 ON table1.field = table2.field RIGHT JOIN table3 ON table1

How to do a full outer join in Linq?

由 流过昼夜 提交于 2019-11-27 12:20:31
I've inherited a database that wasn't designed exactly optimally, and I need to manipulate some data. Let me give a more common analogy of the kind of thing I have to do: Let's say we have a Student table, a StudentClass table keeping record of all the classes he attended, and a StudentTeacher table that stores all the teachers who taught this student. Yes, I know it's a dumb design and it would make more sense to store the teacher on the Class table - but that's what we're working with. I now want to clean up the data, and I want to find all the places where a student has a teacher but no

SQL Server: What is the difference between CROSS JOIN and FULL OUTER JOIN?

由 戏子无情 提交于 2019-11-27 02:54:41
What is the difference between CROSS JOIN and FULL OUTER JOIN in SQL Server? Are they the same, or not? Please explain. When would one use either of these? A cross join produces a cartesian product between the two tables, returning all possible combinations of all rows. It has no on clause because you're just joining everything to everything. A full outer join is a combination of a left outer and right outer join. It returns all rows in both tables that match the query's where clause, and in cases where the on condition can't be satisfied for those rows it puts null values in for the

MySQL: FULL OUTER JOIN - How do I merge one column?

由 半世苍凉 提交于 2019-11-27 00:59:47
问题 I have a question regarding a FULL OUTER JOIN in MySQL. I have two (or more tables): table1 table2 id value id value2 1 a 1 b 2 c 3 d 3 e 4 f I have used this query to get my join: SELECT * FROM table1 LEFT OUTER JOIN table2 ON table1.`id`=table2.`id` UNION SELECT * FROM table1 RIGHT OUTER JOIN table2 ON table1.`id`=table2.`id` to get: id value1 id value2 1 a 1 b 2 c NULL NULL 3 e 3 d NULL NULL 4 f My problem is that I don't manage to simultaneously collapse the two id columns into one column

FULL OUTER JOIN with SQLite

由 你说的曾经没有我的故事 提交于 2019-11-26 16:05:13
SQLite only has INNER and LEFT JOIN. Is there a way to do a FULL OUTER JOIN with SQLite? Yes, see the example on Wikipedia . SELECT employee.*, department.* FROM employee LEFT JOIN department ON employee.DepartmentID = department.DepartmentID UNION ALL SELECT employee.*, department.* FROM department LEFT JOIN employee ON employee.DepartmentID = department.DepartmentID WHERE employee.DepartmentID IS NULL Following Jonathan Leffler's comment, here's an alternative answer to that of Mark Byers': SELECT * FROM table_name_1 LEFT OUTER JOIN table_name_2 ON id_1 = id_2 UNION SELECT * FROM table_name

How to do a full outer join in Linq?

由 给你一囗甜甜゛ 提交于 2019-11-26 15:58:16
问题 I've inherited a database that wasn't designed exactly optimally, and I need to manipulate some data. Let me give a more common analogy of the kind of thing I have to do: Let's say we have a Student table, a StudentClass table keeping record of all the classes he attended, and a StudentTeacher table that stores all the teachers who taught this student. Yes, I know it's a dumb design and it would make more sense to store the teacher on the Class table - but that's what we're working with. I

SQL Server: What is the difference between CROSS JOIN and FULL OUTER JOIN?

由 廉价感情. 提交于 2019-11-26 08:47:52
问题 What is the difference between CROSS JOIN and FULL OUTER JOIN in SQL Server? Are they the same, or not? Please explain. When would one use either of these? 回答1: A cross join produces a cartesian product between the two tables, returning all possible combinations of all rows. It has no on clause because you're just joining everything to everything. A full outer join is a combination of a left outer and right outer join. It returns all rows in both tables that match the query's where clause,

FULL OUTER JOIN with SQLite

由 拟墨画扇 提交于 2019-11-26 04:19:22
问题 SQLite only has INNER and LEFT JOIN. Is there a way to do a FULL OUTER JOIN with SQLite? 回答1: Yes, see the example on Wikipedia. SELECT employee.*, department.* FROM employee LEFT JOIN department ON employee.DepartmentID = department.DepartmentID UNION ALL SELECT employee.*, department.* FROM department LEFT JOIN employee ON employee.DepartmentID = department.DepartmentID WHERE employee.DepartmentID IS NULL 回答2: Following Jonathan Leffler's comment, here's an alternative answer to that of

LINQ - Full Outer Join

由 孤人 提交于 2019-11-25 22:57:39
问题 I have a list of people\'s ID and their first name, and a list of people\'s ID and their surname. Some people don\'t have a first name and some don\'t have a surname; I\'d like to do a full outer join on the two lists. So the following lists: ID FirstName -- --------- 1 John 2 Sue ID LastName -- -------- 1 Doe 3 Smith Should produce: ID FirstName LastName -- --------- -------- 1 John Doe 2 Sue 3 Smith I\'m new to LINQ (so forgive me if I\'m being lame) and have found quite a few solutions for
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