MySQL :: MySQL 5.0 Reference Manual :: 8.2.1.7 LEFT JOIN and RIGHT JOIN Optimization
http://dev.mysql.com/doc/refman/5.0/en/left-join-optimization.html
If there is a row in A that matches the WHERE clause, but there is no row in B that matches the ON condition, an extra B row is generated with all columns set to NULL. (In other words, any condition in the WHERE clause is not used.) All standard join optimizations are performed, with the exception that a table is always read after all tables on which it depends
http://businessintelligence.ittoolbox.com/groups/technical-functional/sas-l/left-join-versus-left-outer-join-in-proc-sql-4662777
Dennis Top Best Answer 0 Mark this reply as the best answer?(Choose carefully, this can't be changed) I have a link to a web page that tries to explain things visually. No spaces please The Profile Name is already in use Password Notify me of new activity in this group: Real Time Daily Never Keep me informed of the latest: White Papers Newsletter Jobs By clicking "Join Now", you agree to Toolbox for Technology terms of use, and have read and understand our privacy policy
Left outer join and subquery.
http://www.sqlservercentral.com/Forums/Topic1123595-149-1.aspx
Can you suggest me a book that discusses in much detail different issues related to joins?Thank youYou're posting in a SQL Server forum, so I would assume you're learning TSQL, not PLSQL
http://www.c-sharpcorner.com/UploadFile/3d39b4/inner-join-cross-join-and-left-outer-join-with-linq-to-sql/
Reader Level: Article Inner Join, Cross Join and Left Outer Join With LINQ to SQL By Sandeep Singh Shekhawat on Oct 28, 2012 .NET, Join with LINQ to SQL, LINQ to SQL, LINQ to SQL
SQL OUTER JOIN - Left Join, Right Join and Full Outer Join
http://www.zentut.com/sql-tutorial/sql-outer-join/
Therefore you can easily emulates the SQL full outer join using SQL left join and SQL right join with UNION operator as follows: SELECT column1, column2..
Oracle LEFT JOIN vs. LEFT OUTER JOIN: What's the difference?
http://searchoracle.techtarget.com/answer/Oracle-LEFT-JOIN-vs-LEFT-OUTER-JOIN-Whats-the-difference
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How to use the LEFT JOIN vs. RIGHT OUTER JOIN in SQL
http://searchsqlserver.techtarget.com/feature/How-to-use-the-LEFT-vs-RIGHT-OUTER-JOIN-in-SQL
Note For those of you following along with the complete syntax diagrams in Appendix A, SQL Standard Diagrams, note that we've pulled together the applicable parts (from Select Statement, Table Reference, and Joined Table) into simpler diagrams that explain the specific syntax we're discussing. You could also join the second and third tables first (as long as the third table is, in fact, related to the second table and not the first one) and then perform the final JOIN with the first table
Oracle Left Outer Join
http://www.dba-oracle.com/tips_oracle_left_outer_join.htm
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http://psoug.org/snippet.htm/LEFT-JOIN-example-and-syntax_731.htm
This means that a left outer join returns all the values from the left table, plus matched values from the right table (or NULL in case of no matching join predicate). The result of a left outer join (or simply left join) for table A and B always contains all records of the "left" table (A), even if the join-condition does not find any matching record in the "right" table (B)
Left join and Left outer join in SQL Server - Stack Overflow
http://stackoverflow.com/questions/406294/left-join-and-left-outer-join-in-sql-server
INNER is the default; LEFT, RIGHT, and FULL imply an outer join." In another words, LEFT JOIN and LEFT OUTER JOIN ARE THE SAME RIGHT JOIN and RIGHT OUTER JOIN ARE THE SAME I hope it can be a contribute for those who are still trying to find the answer. Why would they use OUTER in the FULL JOINS but not in the LEFT and RIGHT JOINS? This is what causes the whole confusion with OUTER - the mixed usage of it
MySQL - LEFT JOIN and RIGHT JOIN, INNER JOIN and OUTER JOIN
http://www.wellho.net/mouth/158_MySQL-LEFT-JOIN-and-RIGHT-JOIN-INNER-JOIN-and-OUTER-JOIN.html
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sql - What is the difference between Left, Right, Outer and Inner Joins? - Stack Overflow
http://stackoverflow.com/questions/448023/what-is-the-difference-between-left-right-outer-and-inner-joins
Here is an example of when you might want to use each type: INNER: You want to return all records from the "Invoice" table, along with their corresponding "InvoiceLines". Left outer join: The same as an inner join, except that if there is any row for which no matching row in the table on the right can be found, a row is output containing the values from the table on the left, with NULL for each value in the table on the right
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