sql server using where criteria for multiple values being passed - sql

Question

I am trying to pass from 1 to 10 criterias to a stored procedure that uses a select statement below in this procedure below:
ALTER PROCEDURE [dbo].[Original_Docs]
#Cat varchar(255),
#docType VARCHAR(255),
#IdNo VARCHAR(50)
AS
BEGIN
SELECT
d4.id as DOCUMENT_ID, c.name as Category, dt.name as Document_Type,
mv1.value as GUIDELINE_MASTER, mv2.value as ID_NUMBER, mv3.value as [DATE],
mv4.value as DESCRIPTION, mv5.value AS BUDGET_NUM, mv6.value as STATUS,
mv7.value AS [CLOSED DATE], mv8.value AS REPORT_TYPE
FROM Documents d4
JOIN (
SELECT d2.id
FROM Documents d2
JOIN (
SELECT d.fileStoreId, MIN(d.createdDate) as CreatedDate
FROM Documents d
JOIN FileStores fs ON d.fileStoreId = fs.id
WHERE fs.shared = 1 AND d.dateDeleted IS NULL
GROUP BY d.fileStoreId
) AS f ON d2.fileStoreId = f.fileStoreId AND d2.createdDate = f.CreatedDate
UNION
SELECT d3.id
FROM Documents d3
JOIN FileStores fs2 ON d3.fileStoreId = fs2.id
WHERE fs2.shared = 0 AND d3.dateDeleted IS NULL
) AS f2 ON f2.id = d4.id
JOIN DocumentTypes dt ON d4.documentTypeId = dt.id
JOIN Categories c ON dt.categoryId = c.id
LEFT OUTER JOIN mv_guideline_master mv1 ON d4.id = mv1.documentId
LEFT OUTER JOIN mv_id_number mv2 ON d4.id = mv2.documentId
LEFT OUTER JOIN mv_date mv3 ON d4.id = mv3.documentId
LEFT OUTER JOIN mv_description mv4 ON d4.id = mv4.documentId
LEFT OUTER JOIN mv_budgetnum mv5 ON d4.id = mv5.documentId
LEFT OUTER JOIN mv_status mv6 ON d4.id = mv6.documentId
LEFT OUTER JOIN mv_closed_date mv7 ON d4.id = mv7.documentId
LEFT OUTER JOIN mv_report_type mv8 ON d4.id = mv8.documentId
WHERE c.name = #Cat AND (dt.name = #docType OR mv2.value = #IdNo)
ORDER BY mv1.value
I will need to add the rest of the other criteria after I figure out how to do it with 3 criteria. In the where clause, I am passing parameters #Cat, #docType, and #IdNo. how do I query using these criteria with the one of these being filled in with the other one or 2 blank? Or if all of them where passed in or if only 2 were passed in. If I use AND then it doesn't work or if I use OR between the criteria, it will bring back the wrong result. Do I need Parens somewhere for it to work?
thanks!

Answer 1

Not sure I follow exactly, if each variable can be NULL:
WHERE (c.name = #Cat OR #Cat IS NULL)
AND ((dt.name = #docType OR #docType IS NULL)
OR (mv2.value = #IdNo OR #IdNo IS NULL))
or if blank:
WHERE (c.name = #Cat OR #Cat = '')
AND ((dt.name = #docType OR #docType = '')
OR (mv2.value = #IdNo OR #IdNo = ''))