How to write the query with parameters below and is null
Hi, I need to recover the data if the parameter is passed on the ground, else retrieve all records where the field is null
Example of
CREATE TABLE DEPT
(DEPTNO NUMBER (2),)
DNAME VARCHAR2 (14).
LOC VARCHAR2 (13));
INSERT INTO DEPT VALUES (10, 'ACCOUNTING', 'NEW YORK');
INSERT INTO VALUES DEPT (20, 'SEARCH', 'DALLAS');
insert into dept values (30, 'SALES', 'CHICAGO');
INSERT INTO VALUES DEPT (40, 'OPERATIONS', 'BOSTON');
ALTER table dept add (object_id number);
insert into dept values (50, 'OPERATIONS', 'BOSTON', 1);
insert into dept values (60, 'OPERATIONS', 'BOSTON', 1);
INSERT INTO VALUES DEPT (70, 'OPERATIONS', 'BOSTON', 2);
Select * from Department where object_id =: p_object_id
If I pass the object_id 1, it shloud retrieve the values of dept with object_id 1, but if I don't pass the object_id, it must retrieve all records where object_id is null
IF 1 is passed as the id of the object, he must recover, 50, 60, if 1 is not passed as object_id it should 10,20,30,40 retive
It works fine for me separately as,.
Select * from Department where object_id =: p_object_id - 1
Select * from Department where the object_id is null;
Is it possible to do in a single query.
Thank you
SELECT * FROM dept WHERE object_id = :p_object_id OR (object_id is null and :p_object_id is null)
is an approach. It's a little talkative, but the meaning is clear. If you can identify a value that would never appear in the data (for example-1)
WHERE nvl( object_id, -1 ) = nvl(p_object_id, -1 );
Justin
Tags: Database
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