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  • Committer: Joseph Daly
  • Date: 2010-10-24 03:19:07 UTC
  • mto: (1856.2.16 transaction_id_innodb)
  • mto: This revision was merged to the branch mainline in revision 1900.
  • Revision ID: skinny.moey@gmail.com-20101024031907-cnkdjmjycx62jsv0
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docs/where.rst
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Where
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=====
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The WHERE clause is used to extract only those records that fulfill a specified criterion.
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Simple SQL WHERE Syntax:
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.. code-block:: mysql
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        SELECT column_name(s)
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        FROM table_name
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        WHERE column_name operator value
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**Simple WHERE Clause Example**
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The "Persons" table:
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+---------+------------+----------+----------+--------+
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|Id       |LastName    |FirstName |Address   |  City  |
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+=========+============+==========+==========+========+
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| 1       | Larson     | Sue      |3 Cherry  | Chicago|
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+---------+------------+----------+----------+--------+
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| 2       | Roberts    | Teri     |21 Brown  | Chicago|
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+---------+------------+----------+----------+--------+
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| 3       | Peterson   | Kari     |30 Mell   | Reno   |
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+---------+------------+----------+----------+--------+
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If you want to select only the persons living in the city "Chicago" from the table above, use the following SELECT statement:
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.. code-block:: mysql
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        SELECT * FROM Persons
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        WHERE City='Chicago'
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The result-set will look like this:
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+---------+------------+----------+----------+--------+
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| Id      |LastName    |FirstName |Address   |City    |
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+=========+============+==========+==========+========+
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|1        | Larson     | Sue      |3 Cherry  | Chicago|
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+---------+------------+----------+----------+--------+
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|2        | Roberts    | Teri     |21 Brown  | Chicago|
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+---------+------------+----------+----------+--------+