join combine the two table to gv a resultant set
Inner Join
Cross Join is jsut another Join
Left Inner Join will be faaster
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A Join SQL clause is a combination of two or more tables from a database. Fields are joined by using data that is present in both tables and are written as an identification for the join.
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A SQL join clause combines records from two or sometimes more than two tables in to a database. This creates a set that can be used as it is or can be saved as a table.
glue
Join is used to combine related tuples from two relations . Full outer join cover all possible combinations of common tuples.
Outer Join in SQL is used to retrieve all records from one table and only matching records from another table. It helps to retrieve data from related tables even if there are no matching records in one of the tables.
View in SQL is a virtual table.It is possible to add SQL functions ,WHERE and JOIN statements to a view.This will help in presenting the data as if coming from a single table.It is possible to update the view also .We can drop a view also if not needed.
SQL is a mostly standard language that allows for analysis and presentation of data stored in a database. The INNER JOIN command is one of the basic SQL commands. SQL training will teach you how to use this command, as well as the commands that result in other types of joins, like outer joins, left outer joins, etc. The best SQL training sources will present you with a simple set of raw data and examples of the result sets generated from each type of query. Be aware that there are several similar versions of SQL that vary with each target database (SQL Server, DB2, etc.) so be sure that the training you sign up for is specific to the database that you intend to use.