SQL WHERE clause same column multiple times? - sql

Question

My table looks like this, let's call it Table1:
ID | value | formID
----------------------
25 Business 1001
16 John 1001
5 2/20/17 1001
30 FormXYZ 1001
25 Nursing 2345
16 Sam 2345
5 1/15/17 2345
30 FormXYZ 2345
25 Tech 4500
16 Sam 4500
5 2/1/17 4500
30 FormC 4500
The ID is the unique identifier of that field:
25 = Department
16 = Name
5 = Date
30 = Form Name, we have multiple different Forms, and I just need FormXYZ data.
FormID is a unique ID for each form submitted, the form contains 3 fields.
I have been trying to write a single query that retrieves all data looking something like this if possible:
Department | Name | Date
Business John 2/20/17
Nursing Sam 1/15/17
Here is what I have been trying, nesting and CASE didn't seem to work right for me, so I am posting here and I am right back where I started at.
SELECT value
FROM Table1
WHERE ID = '25'
UNION ALL
SELECT value
FROM Table1
WHERE ID = '16'
UNION ALL
SELECT value
FROM Table1
WHERE ID = '5'
UNION ALL
SELECT value
FROM Table1
WHERE ID = '30' and value = 'FormXYZ'

Answer 1

One way to transpose data in SQL is to use case statements and roll up the data using a group by:
select
formID,
max(case when ID=25 then value else null end) as Department,
max(case when ID=16 then value else null end) as Name,
max(case when ID=5 then value else null end) as Date
from Table1
group by formID
This produces:
formid Department Name Date
1001 Business John 2/20/17
2345 Nursing Sam 1/15/17
4500 Tech Sam 2/1/17
You can add a where clause as needed. This should get the data in a single scan.

Answer 2

select dp.value as department,
n.value as name,
dt.value as date
from
(select formID, value from table1 where id = 25) as dp
inner join (select formID, value from table1 where id = 16) as n
on dp.formID = n.formID
inner join (select formID, value from table1 where id = 5) as dt
on dp.formID = dt.formID
inner join (select formID, value from table1 where id = 30) as f
on dp.formID = f.formID
where f.value = 'FormXYZ';
OR
select
case when id = 25 then value end as department,
case when id = 5 then value end as date,
case when id = 16 then value end as name
from table1
where formId in (select formID from table1
where id = 30 and value = 'FormXYZ')
and id in (5,16,25);