【转】Oracle/PLSQL: Decode Function

文章转自：http://www.techonthenet.com/oracle/functions/decode.php

In Oracle/PLSQL, the decode function has the functionality of an IF-THEN-ELSE statement.

The syntax for the decode function is:

expression is the value to compare.

search is the value that is compared against expression.

result is the value returned, if expression is equal to search.

default is optional. If no matches are found, the decode will return default. If default is omitted, then the decode statement will return null (if no matches are found).

Applies To:

• Oracle 9i, Oracle 10g, Oracle 11g

For Example:

You could use the decode function in an SQL statement as follows:

SELECT supplier_name,
decode(supplier_id,	10000,	'IBM',
	10001,	'Microsoft',
	10002,	'Hewlett Packard',
		'Gateway') result
FROM suppliers;

The above decode statement is equivalent to the following IF-THEN-ELSE statement:

IF supplier_id = 10000 THEN
     result := 'IBM';

ELSIF supplier_id = 10001 THEN
    result := 'Microsoft';

ELSIF supplier_id = 10002 THEN
    result := 'Hewlett Packard';

ELSE
    result := 'Gateway';

END IF;

The decode function will compare each supplier_id value, one by one.