This document provides an overview of SQL (Structured Query Language) including its history, uses, basic components and syntax. SQL is a language used to manage and analyze relational database systems. It was developed in the 1970s and is widely used today, particularly to perform data mining and analyze relationships within large datasets in industries like banking and healthcare. The document defines common SQL components like tables, rows, columns and keys and provides examples of basic queries using operators and functions.

1. Big Data, SQL & You
By Robert Birch

2.  It was a language designed for managing
data held in a relational database
management system.
 It was designed by Donald D. Chamberlin and
Raymond F. Boyce of IBM.
 The first prototype of the language came out
in 1974 and since then there has been many
variations of the language.

3.  It is a great language to use for data mining
and analyzing relationships.
 Many companies use SQL for analyzing data
like banking and healthcare companies.

4.  Table- contains data
 Row- are information for many types of
categories i.e. company’s name, company’s
industry
 Column-a column contains all the data from
a row for a specific entry. E.g. it would list all
the names of companies.
 Primary Key- is an unique identifier for data
between two tables

5.  =: Equal
 <> : Not Equal
 >: Greater than
 <:Less Than
 >= Greater than or equal
 <=Less than or equal
 BETWEEN: Between an inclusive range
 LIKE: Search for a pattern
 IN: To specify multiple possible values for a
column

6. SELECT *
FROM STOCKS;

7. SELECT Company_Name, Market_Cap
FROM STOCKS
WHERE Industry="Lodging";

8. SELECT Company_Name, Market_Cap, PE
FROM STOCKS
ORDER BY Market_Cap DESC;

9. SELECT *
FROM STOCKS
WHERE Market_Cap Between 20 AND 250
ORDER BY Market_Cap;

10. SELECT Company_Name, ROA
FROM StocksFinancial
WHERE ROA>=0.07;

11. SELECT * FROM StocksFinancial
WHERE Company_Name IN
(
SELECT Company_Name
FROM Stocks
WHERE market_cap <= 13
);

12. SELECT * FROM StocksFinancial
WHERE Company_Name LIKE "N*";

13. SELECT AVG(Market_cap) AS AverageMarketCap
FROM Stocks;

14. SELECT MAX(Market_cap) AS AverageMarketCap
FROM Stocks;

15.  DROP STOCKS; ( Delete a table, not
supported by Microsoft Access)

16.  http://www.w3schools.com/sql/default.asp
 http://stackoverflow.com/
 http://www.sqlcourse.com/index.html