Tables
TRANSACTIONS
SUPP_ID | PAYMENT
----------+----------
1001 200
1002 100
1005 250
MASTER_SUPPLIERS
SUPP_ID | AREA
----------+----------
1001 ABC
1002 XYZ
1003 TYU
1004 MNO
1005 PQR
Intention:
Find those count of suppliers area wise where no payment (NO_TRANS_CNT) has been received
SELECT AREA, COUNT(*) AS NO_TRANS_CNT FROM MASTER_SUPPLIERS
WHERE AREA NOT IN (SELECT DISTINCT(AREA) FROM TRANSACTIONS)
GROUP BY AREA
AREA | NO_TRANS_CNT
----------+--------------
TYU 1
MNO 1
Want to ask: Now, I also want to add the column TOTAL_SUPPLIERS in this area
AREA | TOTAL SUPPLIERS | NO_TRANS_CNT
----------+--------------------+----------------
ABC 1 0
XYZ 1 0
TYU 1 1
MNO 1 1
PQR 1 0
I think it can be achieved using JOINs, but I am not able to get how ?
Try this:
SELECT
M.AREA
, COUNT(1) TOTAL_SUPPLIERS
, COUNT(CASE WHEN T.SUPP_ID IS NULL THEN 1 END) NO_TRANS_CNT
FROM MASTER_SUPPLIERS M
LEFT JOIN TRANSACTIONS T ON T.SUPP_ID = M.SUPP_ID
GROUP BY M.AREA;
Something like
select M.AREA, COUNT(*) as TOTAL_SUPPLIERS, COUNT(T.PAYMENT) as NO_TRANS_CNT
from MASTER_SUPPLIERS M left join TRANSACTIONS T
on M.SUPP_ID = T.SUPP_ID
group by M.AREA;
could work.
Note that the COUNT(T.PAYMENT) only counts those where the PAYMENT is not NULL.
Use a left join, but start with suppliers:
select ms.area, count(*) as num_suppliers, count(t.supp_id) as num_transactions
from master_suppliers ms left join
transactions t
on t.supp_id = m.supp_id
group by ms.area;
The left join keeps everything in the first table -- which is what you want, along with matching rows from the second.
When you count the number of transactions, the argument to count() should either be a column used in the on clause or the primary key.
Related
I have three tables, table1 is connected to table2 and table3, but table2 and table3 are not connected. I need an output count of table2 and table3 for each table1 row. I have to use joins and a group by table1.name
SELECT Tb_Product.Name, count(TB_Offers.Prod_ID) 'Number of Offers', count(Tb_Requests.Prod_ID) 'Number of Requests'
FROM Tb_Product LEFT OUTER JOIN
Tb_Requests ON Tb_Product.Prod_ID = Tb_Requests.Prod_ID LEFT OUTER JOIN
TB_Offers ON Tb_Product.Prod_ID = TB_Offers.Prod_ID
GROUP BY Tb_Product.Name
I need to combine these queries:
SELECT Tb_Product.[Name], count(TB_Offers.Prod_ID) 'Number of Offers'
FROM Tb_Product LEFT OUTER JOIN
TB_Offers ON Tb_Product.Prod_ID = TB_Offers.Prod_ID
GROUP BY Tb_Product.[Name]
SELECT Tb_Product.[Name], count(Tb_Requests.Prod_ID) 'Number of Requests'
FROM Tb_Product LEFT OUTER JOIN
Tb_Requests ON Tb_Product.Prod_ID = Tb_Requests.Prod_ID
GROUP BY Tb_Product.[Name]
Results:
Name Number of Offers
Airplane 6
Auto 5
Bike 3
Camera 0
Computer 12
Milk 4
Oil 4
Orange 6
Telephone 0
Truck 6
TV 4
Name Number of Requests
Airplane 1
Auto 5
Bike 0
Camera 2
Computer 6
Milk 4
Oil 5
Orange 6
Telephone 0
Truck 1
TV 5
My results for offers and requests are the same value. I am not sure what I am doing wrong with the joins. Do I need to somehow join product to request and separately join product to offers? This needs to be done in one query.
This is for a class. Explanation would also be appreciated.
The simplest way to do this is to count the distinct values of each column:
SELECT
Tb_Product.Name,
count(distinct TB_Offers.Prod_ID) 'Number of Offers',
count(distinct Tb_Requests.Prod_ID) 'Number of Requests'
FROM
Tb_Product
LEFT OUTER JOIN
Tb_Requests ON Tb_Product.Prod_ID = Tb_Requests.Prod_ID
LEFT OUTER JOIN
TB_Offers ON Tb_Product.Prod_ID = TB_Offers.Prod_ID
GROUP BY
Tb_Product.Name
This is necessary because of the way joins work consecutively to produce a rowset that is a combination of all the input relations. COUNT() normally performs a count of non-null values in a column.
You can also do something like this, which aggregates the counts from the child tables independently and then joins them to the base table:
SELECT
p.Name,
o.cnt as Offer_Count,
r.cnt as Request_Count
FROM
TB_Product p
LEFT OUTER JOIN
(SELECT Prod_ID, COUNT(1) cnt FROM TB_Offers GROUP BY Prod_ID) o
LEFT OUTER JOIN
(SELECT Prod_ID, COUNT(1) cnt FROM TB_Requests GROUP BY Prod_ID) r
More explanation...
Let's say you have two products:
Prod_ID
Name
1
Widget
2
Gizmo
And two offers, one for each product:
Offer_ID
Prod_ID
100
1
200
2
And two requests for each product:
Request_ID
Prod_ID
1001
1
1002
1
2001
2
2002
2
Now you join Product relation to Offer relation on Prod_ID, you get a result like this:
Prod_ID
Name
Offer_ID
Prod_ID
1
Widget
100
1
2
Gizmo
200
2
Now when you join that relation to Requests on Prod_ID, you get something like this:
Prod_ID
Name
Offer_ID
Prod_ID
Request_ID
Prod_ID
1
Widget
100
1
1001
1
1
Widget
100
1
1002
1
2
Gizmo
200
2
2001
2
2
Gizmo
200
2
2002
2
Now when you count any of these columns you get 4 because each column has 4 values.
I just want to get the result which displays the reference which is not tallied in sum of table2. when i run my query below it will give me an wrong sum which it gets doubled even if group by cusid ,refno.
Table 1
RefNo
CusID
TotalAmount
1
1001
50
2
1001
30
3
1002
40
Table 2
RefNo
CusID
Particular
Amount
1
1001
Paper
30
1
1001
Pencil
30
2
1001
Ball
15
2
1001
Rubber
20
3
1002
Laptop
50
select * from Table1 a
INNER JOIN (Select CusID,RefNo, SUM(Amount) as CorrectTotal from Table2 group by
CusID,RefNo,
)b
ON b.CusID= a.CusID AND b.RefNo= a.RefNo
where a.TotalAmount != CorrectTotal
Expected Result
If you do it with FULL JOIN and with GROUP BY, you will also get rows where there is no record in the other table.
SELECT COALESCE(a.RefNo, b.RefNo) AS RefNo
, COALESCE(a.CusID, b.CusID) AS CusID
, a.TotalAmount
, SUM(b.Amount) AS CorrectTotal
FROM table1 a
FULL JOIN table2 b ON a.RefNo = b.RefNo
AND a.CusID = b.CusID
GROUP BY COALESCE(a.RefNo, b.RefNo)
, COALESCE(a.CusID, b.CusID)
, a.TotalAmount
ORDER BY 1, 2
Output
RefNo
CusID
TotalAmount
CorrectTotal
1
1001
50
60
2
1001
30
35
3
1002
40
50
8
888
88
(null)
9
999
(null)
99
See running demo on SQL Fiddle.
The other answer will work, but if you don't want to mess with a GROUP BY on the whole query you can also use an APPLY to do this:
SELECT a.*, c.CorrectAmount
FROM Table1 a
OUTER APPLY (
SELECT SUM(Amount) AS CorrectAmount
FROM Table2 b
WHERE b.CusID = a.CusID AND b.RefNo = a.RefNo
) c
WHERE a.TotalAmount <> c.CorrectAmount
Below are examples of the tables I am working with. These only represent the columns relevant to my query
_Requirements
RequirementID fkOwningWsID
-------------------------------------------
REQ-RPT-01 1
REQ-RPT-02 2
_Workstream
pk WsNm
-------------------------------------------
1 Workstream1
2 Workstream2
mnWorkstream_Leads
fkWsID fkEeID
-------------------------------------------
1 1
1 2
2 1
2 2
The below table is a result of a union. Employees can be from different companies, the below union lists all the employee IDs, the IDs for the employees who are from Company 1 (0 otherwise) and IDs for employees from company 2 (0 otherwise)
qryTrackerAllEeList
EeID Company1_ID Company2_ID
-------------------------------------------
1 1 0
2 0 2
I am attempting to view the following result
RequirementID WsNm Company1_Lead Company2_Lead
--------------------------------------------------------------------
REQ-RPT-01 Workstream1 1 2
REQ-RPT-02 Workstream2 1 2
I have issued the following SQL
SELECT DISTINCT Req.RequirementID, Ws.Wsnm, company1_id.ee_id, company2_id.ee_id
FROM (((([_Requirements] AS Req
INNER JOIN [_Workstream] AS Ws ON Req.fkOwningWsID = Ws.pkWsID)
INNER JOIN [mnWorkstream_Leads] AS wsLeads ON Ws.pkWsID = wsLeads.fkWsID)
LEFT OUTER JOIN qryTrackerAllEeList AS company1 ON wsLeads.fkEeID = company1.Company1_ID)
LEFT OUTER JOIN qryTrackerAllEeList AS company2 ON wsLeads.fkEeID = company2.Company2_ID)
The issue is, however, that I retrieve the following results
RequirementID WsNm Company1_Lead Company2_Lead
--------------------------------------------------------------------
REQ-RPT-01 Workstream1 2
REQ-RPT-01 Workstream1 1
REQ-RPT-02 Workstream2 2
REQ-RPT-02 Workstream2 1
Any suggestions on how to eliminate these duplicative rows and null values?
Use MAX() and GROUP BY to only select the non null values and group them into one row:
SELECT DISTINCT Req.RequirementID, Ws.Wsnm,
MAX(company1_id.ee_id) as Company1_Lead, MAX(company2_id.ee_id) as Company2_Lead,
FROM (((([_Requirements] AS Req
INNER JOIN [_Workstream] AS Ws ON Req.fkOwningWsID = Ws.pkWsID)
INNER JOIN [mnWorkstream_Leads] AS wsLeads ON Ws.pkWsID = wsLeads.fkWsID)
LEFT OUTER JOIN qryTrackerAllEeList AS company1 ON wsLeads.fkEeID = company1.Company1_ID)
LEFT OUTER JOIN qryTrackerAllEeList AS company2 ON wsLeads.fkEeID = company2.Company2_ID)
GROUP BY req.RequirementID, Ws.Wsnm
I have the following tables
tblMainequipment
asset_id rev equipment_name
123 0 box
123 1 box
124 0 box
125 0 bottle
tblmainswablocation
asset_id rev swab_location
123 0 cover
123 0 base
123 1 cover
123 1 base
123 1 lock
124 0 cover
124 0 base
125 0 tube
125 0 cover
I did like to get the total count of swablocations for the maximum rev for a particular asset_id. For example, the total number of swab location for asset_id 123 rev 0 is 2 but for rev 1 its 3. I have been trying to figure out for the past few hours but cant seem to find a solution. I am pretty bad with joins. The following shows the what i am trying to get,
query
asset_id maxrev #swablocation equipment_name
123 1 3 box
124 0 2 cover
125 0 2 bottle
I use the following sql
SELECT MEQ.*
FROM tblMainEquipment AS MEQ
INNER JOIN (Select asset_id, max(rev) as maxrev
From tblmainequipment GROUP By asset_id) AS groupmeq ON
(MEQ.asset_id = groupmeq.asset_id) AND (MEQ.rev = groupmeq.maxrev)
I am not sure how i can add the #swablocation into my query.
Here is a method that uses correlated subqueries:
select me.*,
(select count(*)
from tblmainswablocation as sl
where sl.asset_id = me.asset_id
) as numSwabs
from tblMainEquipment as me
where me.rev = (select max(me2.rev) from tblMainEquipment as me2 where me2.asset_id = me.asset_id);
The advantage is that the outer query does not require aggregation.
You need a count and a group by
SELECT MEQ.asset_id maxrev, MEQ.maxrev,
count(blmainswablocations.swab_location), MEQ.equipment_name
FROM tblMainEquipment AS MEQ
INNER JOIN (Select asset_id, max(rev) as maxrev
From tblmainequipment GROUP By asset_id) AS groupmeq ON
(MEQ.asset_id = groupmeq.asset_id) AND (MEQ.rev = groupmeq.maxrev)
Inner join blmainswablocations on MEQ.asset_id = blmainswablocations.asset_id
Group by MEQ.asset_id maxrev
I have following data
Components
componentid title
1 houseRent
2 medical
3 Travelling Allowance
empPayrollMaster
MasterID EmployeeID SalaryMonthID
1 101 1
2 102 1
3 103 1
empPayrollDetail
DetailID MasterID ComponentID amount
1 1 1 100
2 1 2 500
3 2 1 300
4 2 3 250
5 3 1 150
6 3 2 350
7 3 3 450
Required Output
EmployeeID MasterID ComponentID amount
101 1 1 100
101 1 2 500
101 1 3 0
102 2 1 300
102 1 2 0
102 2 3 250
103 3 1 150
103 3 2 350
103 3 3 450
To get the required output if i do left outer join between components and empPayrollDetail I get null in EmployeeID and MasterID and amount Columns. How to modify left join to get the required output
You need to do a CROSS JOIN on Components and empPayrollMaster to generate first all combination of employees and components. Then, do a LEFT JOIN on empPayrollDetail to achieve the result, using ISNULL(amount, 0) for NULL amounts.
SQL Fiddle
SELECT
epm.EmployeeID,
epm.MasterID,
c.ComponentID,
amount = ISNULL(epd.amount, 0)
FROM empPayrollMaster epm
CROSS JOIN Components c
LEFT JOIN empPayrollDetail epd
ON epd.MasterID = epm.MasterID
AND epd.ComponentID = c.ComponentID
Try this
select empPayrollMaster.EmployeeID,empPayrollMaster.MasterID,
Components.componentid,isnull(empPayrollDetail.amount,0)
from empPayrollMaster
left join Components
on empPayrollMaster.EmployeeID is not null
left join empPayrollDetail
on empPayrollDetail.MasterID = empPayrollMaster.MasterID
and empPayrollDetail.ComponentID = Components.componentid
Try this way
select c.EmployeeID,d.MasterID,c.ComponentID,isnull(d.amount,0) as amount from (
select * from Components a
Cross join empPayrollMaster b) c
left outer join empPayrollDetail d on d.componentid =c.componentid
As you want the component amount for each employee in the master table you should use a insull(payrole_detail.amount,0) or, as #Turophile pointed out, the SQL standard function coalesce(payrole_detail.amount,0) for the amounts column.
SELECT Customers.CustomerName, Orders.OrderID
FROM Customers
INNER JOIN Orders
ON Customers.CustomerID=Orders.CustomerID
ORDER BY Customers.CustomerName;