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How would I express this in SQL:<br />
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<a href="https://filedb.experts-exchange.com/incoming/2011/02_w09/413986/Join3.png" target="_blank" title="Join (4 KB)"><img alt="Join" class="file-block lazyload" style="max-width: 138px;" data-src="https://filedb.experts-exchange.com/incoming/2011/02_w09/413986/Join3.png" /></a><br />
and why?
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Join3.png

How would I express this in SQL:



and why?

SQL and Relational Operators

Databases are organized collections of data, most commonly accessed through management systems including schemas, tables, queries and processes that allow users to enter and manipulate the information or utilize it in other fashions, such as with web applications or for reporting purposes.

Databases

MySQL is an open source, relational database management system that runs as a server providing multi-user access to a number of databases. Acquired by Oracle in 2009, it is frequently used in combination with PHP installations, powering most of the WordPress installations.

MySQL Server

SQL (Structured Query Language) is designed to be used in conjunction with relational database products as of a means of working with sets of data. SQL consists of data definition, data manipulation, and procedural elements. Its scope includes data insert, query, update and delete, schema creation and modification, and data access control.