Determine Oracle null == null

Question

I wish to search a database table on a nullable column. Sometimes the value I\'m search for is itself NULL. Since Null is equal to nothing, even NULL, saying

Answer 1

This can also do the job in Oracle.

WHERE MYCOLUMN || 'X'  = SEARCHVALUE || 'X'

There are some situations where it beats the IS NULL test with the OR.

I was also surprised that DECODE lets you check NULL against NULL.

WITH 
TEST AS
(
    SELECT NULL A FROM DUAL
)
SELECT DECODE (A, NULL, 'NULL IS EQUAL', 'NULL IS NOT EQUAL')
FROM TEST