MACROMEDIA COLDFUSION MX 61-CFML Información técnica descargar pdf (Pagina 35)

About SQL 35

Using the SQL WHERE clause to limit the rows returned

To conditionally select data from a table, you can add a WHERE clause to the SELECT

statement, which results in the following syntax:

SELECT column_name FROM table_name WHERE column condition value

With the WHERE clause, you can use any of the following operators:

For example, to select the columns named LastName and FirstName for Clients whose City is

Boston, use the following SELECT statement:

SELECT LastName, FirstName FROM Clients Where City = 'Boston'

The result of the preceding SQL statement contains the following data:

You can compose a WHERE clause with one or more conditions; these are called subclauses. You

join subclauses using the operators AND and OR. The AND operator displays a row if all

conditions that are listed are True. The OR operator displays a row if any of the conditions listed

are True. The following statement shows an example of a WHERE clause with multiple

subclauses:

SELECT LastName, FirstName FROM Clients Where City = 'Boston' AND FirstName =

'Marie'

Operator Description

=Equal

<> Not equal

> Greater than

< Less than

>= Greater than or equal

<= Less than or equal

BETWEEN Between an inclusive range

AND Joins one or more conditions

OR Joins one or more conditions

LIKE Specifies a search for a pattern in a column. You can use a percent sign

(%) to define wildcards (missing letters in the pattern) before and after the

pattern.

LastName FirstName

Brown Marie

Adams Russell

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MACROMEDIA COLDFUSION MX 61-CFML Información técnica Pagina 35