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WHERE
=====
The WHERE clause is used to extract only those records that fulfill a specified criterion.
Simple SQL WHERE Syntax:
.. code-block:: mysql
SELECT column_name(s)
FROM table_name
WHERE column_name operator value
**Simple WHERE Clause Example**
The "Persons" table:
+---------+------------+----------+----------+--------+
|Id |LastName |FirstName |Address | City |
+=========+============+==========+==========+========+
| 1 | Larson | Sue |3 Cherry | Chicago|
+---------+------------+----------+----------+--------+
| 2 | Roberts | Teri |21 Brown | Chicago|
+---------+------------+----------+----------+--------+
| 3 | Peterson | Kari |30 Mell | Reno |
+---------+------------+----------+----------+--------+
If you want to select only the persons living in the city "Chicago" from the table above, use the following SELECT statement:
.. code-block:: mysql
SELECT * FROM Persons
WHERE City='Chicago'
The result-set will look like this:
+---------+------------+----------+----------+--------+
| Id |LastName |FirstName |Address |City |
+=========+============+==========+==========+========+
|1 | Larson | Sue |3 Cherry | Chicago|
+---------+------------+----------+----------+--------+
|2 | Roberts | Teri |21 Brown | Chicago|
+---------+------------+----------+----------+--------+
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