检查查询中传递的参数中是否存在某个值（SQL SERVER）

Question

So I need to determine if a certain value exist in the passed parameter to perform a certain condition. Here's the query below:

DECLARE @PCStatusas varchar(50);

SELECT * FROM 
Employee emp 
WHERE (emp.PCStatus IN (@PCStatus) OR @PCStatus = '') 
OR 

('ON-HOLD' IN (@PCStatus)

AND CAST(emp.EffectiveDate AS DATE) <= CAST(GETDATE() AS DATE)))

so what i need is to check if the parameter sent contain the value 'ON-HOLD' to perform the EffectiveDate condition being equal or less than today.

Answer 1

You can do like (@PCStatus like '%ON-HOLD%')

DECLARE @PCStatusas varchar(50);

SELECT * FROM 
Employee emp 
WHERE (emp.PCStatus IN (@PCStatus) OR @PCStatus = '') 
OR 
(@PCStatus like '%ON-HOLD%')

AND CAST(emp.EffectiveDate AS DATE) <= CAST(GETDATE() AS DATE)))

Answer 2

If you have mix AND and OR conditions, it is best to use parenthesis ( ) on it to clearly define the intended conditions.

Also avoid applying function on the column as it will prohibit the use of index on the column. If the EffectiveDate does not contain time, you may simply use equal emp.EffectiveDate = CAST(GETDATE() AS DATE) else you should use >= today and < tomorrow

DECLARE @PCStatus as varchar(50);

SELECT * 
FROM   Employee emp 
WHERE  
(
       emp.PCStatus       = @PCStatus
)
OR     
(
       @PCStatus          = ''
)
OR 
(
       @PCStatus          LIKE '%ON-HOLD%'
AND    emp.EffectiveDate >= CAST(GETDATE() AS DATE)
AND    emp.EffectiveDate <  CAST(DATEADD(DAY, 1, GETDATE()) AS DATE)
)

EDIT : change to LIKE '%ON-HOLD%'

EDIT 2 : @PCStatus is CSV here, the query is using STRING_SPLIT() if you are using earlier version of SQL Server, use the DelimitedSplit8K that i posted in the comments

DECLARE @PCStatus as varchar(50) = 'ACTIVE,ON-HOLD';

SELECT * 
FROM   Employee emp 
WHERE  
(
    @PCStatus          = ''
OR  EXISTS
    (
        select  *
        from    STRING_SPLIT(@PCStatus, ',') x
        where   x.value     = emp.PCStatus
    )
)
AND 
(
    emp.PCStatus      <> 'ON-HOLD'
OR  emp.EffectiveDate <= CAST(GETDATE() AS DATE)
)

Answer 3

So with the help of my colleague, we created a function that splits the csv into a temporary table and there I can simply check if a certain value is in the temporary table and return a Boolean for it. Thanks for the help guys.