How to get 'IS NULL' where clause values if initial condition returns none in oracle
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I have a table with values as follows
![ID S_ID NAME 1 James 2 2455 Patrick 3 2566 Sam 4 25988 Rick]1
My requirement is to get the NAME based on S_ID and if the given S_ID is not in the table then get the NAME with no S_ID
SELECT NAME FROM STUDENTS WHERE S_ID=2455
The result would be Patrick
SELECT NAME FROM STUDENTS WHERE S_ID=2411
The result should be James
I have tried
select NAME from STUDENTS where S_ID=2455 or S_ID IS NULL
It gives be bot James and Patrick
I would really appreciate any help
Here's one option:
SQL> set ver off SQL> with students (id, s_id, name) as 2 (select 2, 2389, 'Patrick' from dual union all 3 select 1, null, 'James' from dual union all 4 select 3, 2566, 'Sam' from dual 5 ) 6 select name from students where s_id = &&par_s_id 7 and exists (select null from students where s_id = &&par_s_id) 8 union all 9 select name from students where s_id is null 10 and not exists (select null from students where s_id = &&par_s_id); Enter value for par_s_id: 2389 NAME ------- Patrick --> because S_ID = 2389 exists in a table SQL> undefine par_s_id SQL> / Enter value for par_s_id: 123456 NAME ------- James --> because S_ID = 123456 doesn't exist SQL>
As you already have the table, you'd use code from line #6 onward.
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As per my understanding if S_ID is found in the STUDENT table it should return the NAME of the student, if S_ID is not found the query should return a message as 'No #S_ID'.
Please let me know if I am making any mistake in understanding your question !
[Solution] Its a Tsql so we can use it as is in the sql or in any language. And note I have tested it in MSSQL but the approach remains the same.
declare @sidInput int
set @sidInput = 2455
if exists (select NAME from STUDENTS where S_ID = @sidInput)
select NAME from STUDENTS where S_ID = @sidInput
declare @outputMsg varchar(20)
set @outputMsg = 'No ' + convert( varchar(10), @sidInput)
select top 1 @outputMsg as NAME from STUDENTS where S_ID not in ( @sidInput )
1) For Input @sidInput = 2455
Output - NAME as Patrick
2) For Input @sidInput = 2411
Output - NAME as James
3) For Input @sidInput = 2222 #S_ID value not found in STUDENT table
Output - NAME as No 2222
Let me know if it works for you.
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try this t-sql (and pardon me I was using maria db - so used it ) . basically it remains the same as for my above response its just that I have updated the else block. ( Note - If you are using MySQL can simply use this as it for testing )
DROP PROCEDURE IF EXISTS prod_studentName;
declare sidValue int; set sidValue = 2389; if exists (select NAME from STUDENT where S_ID = sidValue ) then select NAME from STUDENT where S_ID = sidValue; else select NAME from STUDENT where S_ID is NULL; end if;`
refer to the attached image for the table inputs -
positive test - lookup for
s_id = 2389
negative test - lookup for
s_id = 7777 this id doesn't even exist at all
hope this helps you
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- Thank you @Littlefoot
- When s_id was not found, I need the name of the student who doesn't have the s-id. Even if there are more than 1 result, I need all of them.