I don't know how to explain it. But I am trying to join two select statements/queries. I need to include customer and supplier name in the same table.
Table 1 - j:
Job ID, Customer ID
Table 2 - jl:
Job_Line.Job_ID, Supplier_ID
Table 3 - p:
ID, Name
First Select statement - customer name:
Select name
From p
INNER JOIN j ON p.id = j.customer_id
Second Select statement - supplier name:
Select name
From p
INNER JOIN jl ON p.id = jl.supplier_id
Don't know how to join above two selects, so i could have a table like:
id, customer name, supplier name
I am new to SQL and learning online. I understand the basis, but getting stuck at this finding this complex!
This should do the trick
SELECT j.id, pc.name, ps.name
FROM j
INNER JOIN p pc ON j.customer_id = pc.id
INNER JOIN jl ON j.id = jl.job_id
INNER JOIN p ps ON jl.supplier_id = ps.id
Note, pc and ps are table aliases.
Related
Based on the following ERD, I'm trying to write a query that displays reservations made directly by customers and include reservation id, reservation date, customer id, customer first name, tour trip id, tour category name, tour trip date
I've been able to include everything in my query except for the tour category name because the TOUR_SITES table is in the way. Is there a way I can join the category name from the TOUR_PACKAGE table without adding any extra columns?
SELECT r.RESERVATION_ID, r.RESERVATION_DATE,
c.CUSTOMER_ID, c.FIRST_NAME,t.TRIP_ID, o.TRIP_DATE/*, P.CATEGORY_NAME*/
FROM CUSTOMER c
INNER JOIN RESERVATION r
ON
r.CUSTOMER_ID=c.CUSTOMER_ID
INNER JOIN TOURTRIP_RESERVATION t
ON
r.RESERVATION_ID=t.RESERVATION_ID
INNER JOIN TOUR_TRIP O
ON
t.TRIP_ID=o.TRIP_ID
WHERE AGENT_ID IS NULL;
Is there a way I can join the category name from the TOUR_PACKAGE table without adding any extra columns?
Sure; just join all tables you need. You don't have to add additional columns (the ones you don't need) into the select column list, but you do have to use the tour_sites table anyway.
Something like this:
select r.reservation_id, r.reservation_date,
c.customer_id, c.first_name,t.trip_id, o.trip_date,
p.category_name
from customer c inner join reservation r on r.customer_id=c.customer_id
inner join tourtrip_reservation t on r.reservation_id=t.reservation_id
inner join tour_trip o on t.trip_id=o.trip_id
--
join tour_sites s on s.tour_siteid = o.tour_siteid --> add
join tour_package p on p.category_id = s.category_id --> this
where agent_id is null;
You need to first join tour_sites with tour_trip on TOUR_SITEID and then join tour_package with tour_sites on category_id to get the tour category_name. You can join left join on tour_sites in case there are no tour sites assigned for a tour trip like a newly added tour_trip.
SELECT r.RESERVATION_ID, r.RESERVATION_DATE, c.CUSTOMER_ID, c.FIRST_NAME,t.TRIP_ID, o.TRIP_DATE,TP.CATEGORY_NAME
FROM CUSTOMER c
INNER JOIN RESERVATION r ON r.CUSTOMER_ID=c.CUSTOMER_ID
INNER JOIN TOURTRIP_RESERVATION t ON r.RESERVATION_ID=t.RESERVATION_ID
INNER JOIN TOUR_TRIP O ON t.TRIP_ID=o.TRIP_ID
LEFT JOIN TOUR_SITES TS ON TS.TOUR_SITEID = O.TOUR_SITEID
INNER JOIN TOUR_PACKAGE TP ON TP.CATEGORY_ID = TS.CATEGORY_ID
WHERE AGENT_ID IS NULL;
I am trying to select and print customer_name(customer table), room_number(room table), room_rate (room table),rate_type(reservation table), checkin_date(reservation table), checkout_date(reservation table), billing_amount(billing table) from multiple tables. I tried to do an inner join but the error is 'column ambiguously defined '
SELECT *
FROM Customer c
INNER JOIN Reservation r
ON c.customer_id = r.customer_id
INNER JOIN Room s
ON s.room_id = r.room_id
INNER JOIN billing b
ON reservation_id = b.reservation_id
WHERE c.customer_name = 'John Scott';
You're missing the table alias on the left side of the last JOIN. Try this:
SELECT *
FROM Customer c
INNER JOIN Reservation r
ON c.customer_id = r.customer_id
INNER JOIN Room s
ON s.room_id = r.room_id
INNER JOIN billing b
ON r.reservation_id = b.reservation_id
WHERE c.customer_name = 'John Scott';
One problem is in your join and one in your select:
SELECT *
-------^ duplicate column names
FROM Customer c INNER JOIN
Reservation r
ON c.customer_id = r.customer_id INNER JOIN
Room s
ON s.room_id = r.room_id INNER JOIN
billing b
ON reservation_id = b.reservation_id
--------^ missing table alias
WHERE c.customer_name = 'John Scott';
If the only duplicate columns are the JOIN keys, then the USING clause (standard but not supported by all databases) is a handy way to get all the columns:
SELECT *
FROM Customer c INNER JOIN
Reservation r
USING (customer_id) INNER JOIN
Room s
USING (room_id) INNER JOIN
billing b
USING (reservation_id)
WHERE c.customer_name = 'John Scott';
When you using USING, the key columns are not duplicated with SELECT *.
I have three tables that I'm trying to join:
sales
order
employee
For example, the tables have the following attributes.
Sales:
ID
price
Order:
ID
tag
Employee:
tag
yearsWorked
I would like to keep only records that exist from the result of a left join in sales and order -> left join the result with employee
SELECT *
FROM ( SELECT *
FROM SALES
LEFT JOIN ORDER
ON SALES.ID = ORDER.ID) AS SO
LEFT JOIN EMPLOYEE
on SO.TAG = EMPLOEYE.TAG;
The above query does not work.
There is no need for a subquery. All you have to do is 2 LEFT JOIN, each for the respective table. This will make sure that only the results of the first left join are joined with the third table.
SELECT *
FROM SALES S
LEFT JOIN ORDER O ON S.ID = O.ID
LEFT JOIN EMPLOYEE E ON O.TAG = E.TAG;
I hope this works.
SELECT
*
FROM
Order
LEFT JOIN Sales
ON Order.ID = Sales.ID
LEFT JOIN Employee
ON Order.tag = Employee.tag
The following query is designed to find the number of people who went to a hospital, the total number of people who went to a hospital and the divide those two to find a percentage. The table Claims is two million plus rows and does have the correct non-clustered index of patientid, admissiondate, and dischargdate. The query runs quickly enough but I'm interested in how I could make it more usable. I would like to be able to add another code in the line where (hcpcs.hcpcs ='97001') and have the change in percentRehabNotHomeHealth be relfected in another column. Is there possible without writing a big, fat join statement where I join the results of the two queries together? I know that by adding the extra column the math won't look right, but I'm not worried about that at the moment. desired sample output: http://imgur.com/BCLrd
database schema
select h.hospitalname
,count(*) as visitCounts
,hospitalcounts
,round(count(*)/cast(hospitalcounts as float) *100,2) as percentRehabNotHomeHealth
from Patient p
inner join statecounties as sc on sc.countycode = p.countycode
and sc.statecode = p.statecode
inner join hospitals as h on h.npi=p.hospitalnpi
inner join
--this join adds the hospitalCounts column
(
select h.hospitalname, count(*) as hospitalCounts
from hospitals as h
inner join patient as p on p.hospitalnpi=h.npi
where p.statecode='21' and h.statecode='21'
group by h.hospitalname
) as t on t.hospitalname=h.hospitalname
--this where exists clause gives the visitCounts column
where h.stateCode='21' and p.statecode='21'
and exists
(
select distinct p2.patientid
from Patient as p2
inner join Claims as c on c.patientid = p2.patientid
and c.admissiondate = p2.admissiondate
and c.dischargedate = p2.dischargedate
inner join hcpcs on hcpcs.hcpcs=c.hcpcs
inner join hospitals as h on h.npi=p2.hospitalnpi
where (hcpcs.hcpcs ='97001' or hcpcs.hcpcs='9339' or hcpcs.hcpcs='97002')
and p2.patientid=p.patientid
)
and hospitalcounts > 10
group by h.hospitalname, t.hospitalcounts
having count(*)>10
You might look into CTE (Common Table Expressions) to get what you need. It would allow you to get summarized data and join that back to the detail on a common key. As an example I modified your join on the subquery to be a CTE.
;with hospitalCounts as (
select h.hospitalname, count(*) as hospitalCounts
from hospitals as h
inner join patient as p on p.hospitalnpi=h.npi
where p.statecode='21' and h.statecode='21'
group by h.hospitalname
)
select h.hospitalname
,count(*) as visitCounts
,hospitalcounts
,round(count(*)/cast(hospitalcounts as float) *100,2) as percentRehabNotHomeHealth
from Patient p
inner join statecounties as sc on sc.countycode = p.countycode
and sc.statecode = p.statecode
inner join hospitals as h on h.npi=p.hospitalnpi
inner join hospitalCounts on t.hospitalname=h.hospitalname
--this where exists clause gives the visitCounts column
where h.stateCode='21' and p.statecode='21'
and exists
(
select p2.patientid
from Patient as p2
inner join Claims as c on c.patientid = p2.patientid
and c.admissiondate = p2.admissiondate
and c.dischargedate = p2.dischargedate
inner join hcpcs on hcpcs.hcpcs=c.hcpcs
inner join hospitals as h on h.npi=p2.hospitalnpi
where (hcpcs.hcpcs ='97001' or hcpcs.hcpcs='9339' or hcpcs.hcpcs='97002')
and p2.patientid=p.patientid
)
and hospitalcounts > 10
group by h.hospitalname, t.hospitalcounts
having count(*)>10
I can't think through this one. I have this query:
SELECT
p.person_id,
p.first_nm,
p.last_nm,
pu.purchase_dt,
pr.sku,
pr.description,
a.address_type_id,
a.city_cd,
a.state_cd,
a.postal_cd
FROM
person p
INNER JOIN address a ON p.person_id = a.person_id
INNER JOIN purchase pu ON pu.person_id = p.person_id
INNER JOIN product pr ON pr.product_id = pu.product_id
Simple enough - I just need to get the information for customers that we've shipped returns to. However, because of the addressType table
AddressType
address_type_id address_type_desc
------------------------------------
1 Home
2 Shipping
some customers have multiple addresses in the address table, creating non-unique duplicate entries like this.
1,Smith, John, 12/01/2009, A12345, Purple Widget, 1, Anywhere, CA, 12345
1,Smith, John, 12/01/2009, A12345, Purple Widget, 2, Somewhere, ID, 54321
I'd like to get the query to return just one row/person and return the home address if available otherwise, return the shipping address.
This seems simple enough, and maybe it's just my cold, but this is causing me to scratch my head somewhat.
you want to change your join so it returns the min(addressID) instead of all of them:
INNER JOIN address a ON p.person_id = a.person_id
inner join (select person_id, min(address_type_id) as min_addr
from address group by person_id) a_min
on a.person_id = a_min.person_id and a.address_type_id = a_min.min_addr
SELECT
p.person_id,
p.first_nm,
p.last_nm,
pu.purchase_dt,
pr.sku,
pr.description,
COALESCE(ha.address_type_id, sa.address_type_id) AS address_type_id
CASE WHEN ha.address_type_id IS NOT NULL THEN ha.city_cd ELSE sa.city_cd END AS city_cd,
CASE WHEN ha.address_type_id IS NOT NULL THEN ha.state_cd ELSE sa.state_cd END AS state_cd,
CASE WHEN ha.address_type_id IS NOT NULL THEN ha.postal_cd ELSE sa.postal_cd END AS postal_cd
FROM
person p
LEFT JOIN address ha ON p.person_id = ha.person_id AND ha.address_type_id = 1
LEFT JOIN address sa ON p.person_id = sa.person_id AND sa.address_type_id = 2
INNER JOIN purchase pu ON pu.person_id = p.person_id
INNER JOIN product pr ON pr.product_id = pu.product_id
If SQL Server, or other version with common table expressions (CTE), you could do the following. The CTE adds a row-number column that is grouped by person and ordered by the address_type_id. The main query is altered to return number 1 row for each person from the CTE.
WITH cte AS
(
SELECT
a.person_id,
a.address_type_id,
a.city_cd,
a.state_cd,
a.postal_cd,
ROW_NUMBER() over (PARTITION BY person_id ORDER BY address_type_id) AS sequence
FROM address a
INNER JOIN AddressType at ON a.address_type_id = at.address_type_id
)
SELECT
p.person_id,
p.first_nm,
p.last_nm,
pu.purchase_dt,
pr.sku,
pr.description,
a.address_type_id,
a.city_cd,
a.state_cd,
a.postal_cd
FROM
person p
INNER JOIN cte a ON p.person_id = a.person_id
INNER JOIN purchase pu ON pu.person_id = p.person_id
INNER JOIN product pr ON pr.product_id = pu.product_id
WHERE
a.sequence = 1
By the way, if you have person records that have no addresses, you might want to change the INNER JOIN to an OUTER JOIN on the addresses table (cte in my answer). This may also be appropriate for joins to purchase and product if your requirements indicate so.