CODEWITHSUNDEEP
oracle-databaseplsql
Malfist
Malfist

Reputation: 31805

How to make null equal null in oracle

I have a variable being passed to my stored proc and it's a filter (basically). However, that field can sometimes be null, and if it is, I want to be able to check against the rows that have that field as null.

For example,

Table A:

VALUE_COLUMN | FILTER_COLUMN
----------------------------
A            |  (NULL)
B            |  (NULL)           
C            |  (NULL)
D            |  (NULL)
A            |  1
E            |  (NULL)
F            |  (NULL)
B            |  1

The query (With inputs, val, filter):

SELECT  COUNT(1)
  FROM    TableA
WHERE 
  wrap_up_cd = val
  AND brn_brand_id = filter

Expected I/O:

val = A, filter = (null) = 1
val = A, filter = 1 = 1
val = C, filter = 1 = 0

How can I make Oracle behave this way?

Upvotes: 5

Views: 2810

Answers (3)

Elyor Murodov
Elyor Murodov

Reputation: 1028

This can also be handy at times:

   SELECT COUNT(*)
      FROM tableA
   WHERE
      NVL(brn_brand_id, CHR(0)) = NVL(filter, CHR(0))

Upvotes: 1

Justin Cave
Justin Cave

Reputation: 231751

Oracle doesn't have an ISNULL function. So you'd need something like

SELECT COUNT(*)
  FROM tableA
 WHERE brn_brand_id = filter
    OR (    brn_brand_id IS NULL 
        AND filter IS NULL)

Upvotes: 2

Jon Skeet
Jon Skeet

Reputation: 1502216

How about:

SELECT  COUNT(1)
  FROM    TableA
WHERE 
  wrap_up_cd = val
  AND ((brn_brand_id = filter) OR (brn_brand_id IS NULL AND filter IS NULL))

I'm not an Oracle expert, but I'd expect that to work - basically make the query match if both the filter and the value are NULL.

Upvotes: 9

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