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2. Set operations (SQL) - Wikipedia

   en.wikipedia.org/wiki/Set_operations_(SQL)

   Set operations in SQL is a type of operations which allow the results of multiple queries to be combined into a single result set. [ 1 ] Set operators in SQL include UNION , INTERSECT , and EXCEPT , which mathematically correspond to the concepts of union , intersection and set difference .

3. Query by Example - Wikipedia

   en.wikipedia.org/wiki/Query_by_Example

   It was devised by Moshé M. Zloof at IBM Research during the mid-1970s, in parallel to the development of SQL. [1] It is the first graphical query language, using visual tables where the user would enter commands, example elements and conditions. Many graphical front-ends for databases use the ideas from QBE today.

4. Hierarchical and recursive queries in SQL - Wikipedia

   en.wikipedia.org/wiki/Hierarchical_and_recursive...

   A common table expression, or CTE, (in SQL) is a temporary named result set, derived from a simple query and defined within the execution scope of a SELECT, INSERT, UPDATE, or DELETE statement. CTEs can be thought of as alternatives to derived tables ( subquery ), views , and inline user-defined functions.

5. Join (SQL) - Wikipedia

   en.wikipedia.org/wiki/Join_(SQL)

   Actual SQL implementations normally use other approaches, such as hash joins or sort-merge joins, since computing the Cartesian product is slower and would often require a prohibitively large amount of memory to store. SQL specifies two different syntactical ways to express joins: the "explicit join notation" and the "implicit join notation".

6. Database normalization - Wikipedia

   en.wikipedia.org/wiki/Database_normalization

   Database normalization is the process of structuring a relational database accordance with a series of so-called normal forms in order to reduce data redundancy and improve data integrity.

7. Select (SQL) - Wikipedia

   en.wikipedia.org/wiki/Select_(SQL)

   SQL includes operators and functions for calculating values on stored values. SQL allows the use of expressions in the select list to project data, as in the following example, which returns a list of books that cost more than 100.00 with an additional sales_tax column containing a sales tax figure calculated at 6% of the price.

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9. Codecademy - Wikipedia

   en.wikipedia.org/wiki/Codecademy

   In September 2015, Codecademy, in partnership with Periscope, added a series of courses designed to teach SQL, the predominant programming language for database queries. [21] In October 2015, Codecademy created a new course, a class on Java programming. As of January 2014, the site had over 24 million users who had completed over 100 million ...