SQL retrieve rows based on column condition - sql

Question

Say I have below tables
Order Table
OrderNo CategoryID CountryID ServiceTypeID
100 1 3 1
200 2 5 2
300 3 4 4
400 1 2 9
1 service Type might belong to many category type
Category Table
ID Name ServiceTypeID
1 x 1
2 x 2
3 x 1
ServiceType table
ID Name
1 xx
2 xx
3 xx
Tracking Table
OrderNo CountryID TrackingTypeID
100 2 3
200 1 4
100 3 2
400 5 1
200 2 6
Reviewd Table
OrderNo
300
100
200
I want to write a query with below requirements
Order must belong to serviceTypeID = 1 or 2
And If the orderNo has a categoryID = 1
I want that record to be retrieved only if
there's a record in tracking table for that
orderNo with same countryID as in Order table
and if that orderNo doesn't have tracking type of id (0,7,1) in tracking table
Else for all other orders with any other category excluding orders which are not belong
to serviceTypeID = (1,2)
I want that record to be retrived only if
there's an existing record for that orderNo in
Reviewed table
and if that orderNo doesn't have tracking type of id (0,7,1) in tracking table
So basically based on above requirements the result should look like
OrderNo CategoryID StationID
100 1 3
200 2 5
select DISTINCT top 10000 o.orderNo , o.categoryID , o.serviceTypeid
,o.countrtId , Tracking.countryId
from Order o
join Tracking on o.orderNo = Tracking.orderNo
where
(o.CategoryID in (1 ) and o.countryId = Tracking.countryId
and
exists (select 1
from tracking t
where t.orderNo = o.orderNo and t.countryId =
o.countryId
)
)
OR
(o.categoryID in (select id from Category where ServiceTypeid in (7,8) and
ID not in (56 , 65)
) and
exists (select 1
from Reviewed r
where r.orderNo = o.orderNo
)
)
AND not exists
( select 1
from tracking t
WHERE T.orderNo = o.orderNo
and t.TrackingTypeID in (0 , 7 ,25))
That query seems to return only orders with ID 1 and even if it's have a trackingTypeID = 0,7,25

Answer 1

You could use exists and boolean logic:
select o.*
from orders o
where
(
category_id = 1
and exists (select 1 from tracking t where t.order_no = o.order_no and t.country_id = o.country_id)
)
or (
category_id = 2
and exists (select 1 from reviewed r where r.order_no = o.order_no)
)

Answer 2

Based on your conditions, you can use boolean logic with exists:
select o.*
from orders o
where (o.categoryid = 1 and
exists (select 1
from tracking t
where t.orderno = o.orderno and t.CountryID = o.CountryID
)
) or
(o.categoryid = 2 and
exists (select 1
from reviewed r
where r.orderno = o.orderno
)
) ;

Answer 3

According to your conditions this query will give results accordingly:
Select o.OrderNo,o.CategoryID,o.CountryID as StationID
from Order o
inner join Tracking t on t.OrderNo = o.OrderNo and t.CountryID = o.CountryID
where o.CategoryID = 1 or (o.CategoryID = 2
and exists (Select * from Reviewed where OrderNo = o.OrderNo))