Sql difference between inner join and outer join

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Oracle Left Outer Join

  http://www.dba-oracle.com/tips_oracle_left_outer_join.htm
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Using SQL Self Join to Join a Table to Itself

  http://www.zentut.com/sql-tutorial/sql-self-join/
SQL self joins are used to compare values of a column with values of another column in the same table.To construct a self join, you select from the same table twice by using the SELECT statement with an inner join or outer join clause

  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

SQL JOIN - SQL Tutorial

  http://www.sql-tutorial.net/sql-join.asp
In case we have a customer in the Customers table, which still hasn't made any orders (there are no entries for this customer in the Sales table), this customer will not be listed in the result of our SQL query above. The SQL JOIN condition has been specified after the SQL WHERE clause and says that the 2 tables have to be matched by their respective CustomerID columns

  http://www.gplivna.eu/papers/sql_join_types.htm
In the following example none of the rows satisfies condition in WHERE clause, and therefore all of them are being discarded from result set according to step 4 in the algorithm above. SELECT city, text FROM cities NATURAL LEFT OUTER JOIN places; CITY TEXT --------------- --------------- RIGA OLD RIGA LIEPAJA KARA OSTA TALLINN Example 41 In case tables haven't common column name then natural join degrades back to Cartesian join

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

  http://sqlhints.com/2015/08/01/difference-between-sequence-and-identity-in-sql-server/
It is also used to generate a sequence of numbers according to the properties with which it is created Sequence object can be shared across multiple tables Identity property is tied to a Table Sequence object can be used to generate database-wide sequential number across multiple tables. Sequence object provides an option to enable caching, which greatly increases the performance by reducing the disk IO required to generate the next sequence value

  http://sqlhints.com/2013/03/10/difference-between-sql-server-varchar-and-varcharmax-data-type/
It uses the normal data pages until the content actually fills 8k of data.When overflow happens, data is stored as old TEXT Data Type and a pointer is replacing the old content

  http://www.programmerinterview.com/index.php/database-sql/inner-vs-outer-joins/
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SQL OUTER JOIN

  http://infogoal.com/sql/sql-outer-join.htm
Why Use SQL OUTER JOIN? Use the SQL OUTER JOIN whenever multiple tables must be accessed through a SQL SELECT statement and results should be returned if there is not a match between the JOINed tables. A row would be included for each combination between the two tables so if one table has 1,000 rows and the second table has 2,000 rows then 2,000,000 rows would be returned

  http://www.firebirdfaq.org/faq93/
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  http://www.diffen.com/difference/Inner_Join_vs_Outer_Join
There are even joins that can exclude other joins! Video Explaining Inner vs Outer Joins This video explains the difference between various types of joins. Left Outer Join A left outer join will return all the data in Table 1 and all the shared data (so, the inner part of the Venn diagram example), but only corresponding data from Table 2, which is the right join

  http://www.programmerinterview.com/index.php/database-sql/difference-between-a-left-outer-join-and-right-outer-join/
Here we have 2 tables that we will use for our example: Employee Location EmpID EmpName 13 Jason 8 Alex 3 Ram 17 Babu 25 Johnson EmpID EmpLoc 13 San Jose 8 Los Angeles 3 Pune, India 17 Chennai, India 39 Bangalore, India For the purpose of our example, it is important to note that the very last employee in the Employee table (Johnson, who has an ID of 25) is not in the Location table. Outer joins SQL Key Definition Differences between Primary and Foreign Keys Natural Key In Database Secondary Key Simple key in SQL Superkey Example What is Referential Integrity Having vs