I have the following data tables (please find the attached Image). image
I'm trying to execute a query using inner join on more than 2 tables. Following is my query, Please let me know where I'm doing the mistake.
I am using MS-Access.
SELECT Employees.Namee,WeekDay.DayName,Schedule.StartTime,Schedule.Hours FROM Schedule INNER JOIN Employees ON Schedule.Emp_ID = Employees.ID INNER JOIN WeekDay ON Schedule.Weekday = WeekDay.ID;
you need parentheses when you have multiple joins. Try this
SELECT Employees.Namee,WeekDay.DayName,Schedule.StartTime,Schedule.Hours FROM
(Schedule INNER JOIN Employees ON Schedule.Emp_ID = Employees.ID) INNER JOIN
WeekDay ON Schedule.Weekday = WeekDay.ID;
Please try below code
SELECT e.Namee,w.DayName,s.StartTime,s.Hours
FROM Schedule s
INNER JOIN Employees e
INNER JOIN WeekDay w
ON s.Emp_ID = e.ID
ON s.Weekday = w.ID;
Related
Getting an error when running this
UPDATE FlightBooking
INNER JOIN Passenger ON Passenger.FlightBookingId=FlightBooking.FlightBookingId
INNER JOIN AirplaneSeat ON AirplaneSeat.AirplaneSeatId = Passenger.SeatId
INNER JOIN Section ON AirplaneSeat.SectionId = Section.SectionId
INNER JOIN ExtraCost ON ExtraCost.FlightBookingId=FlightBooking.FlightBookingId
INNER JOIN Luggage ON Luggage.LuggageId = ExtraCost.LuggageId
INNER JOIN SportsEquipment ON ExtraCost.SportsEquipmentId=SportsEquipment.SportsEquipmentId
INNER JOIN Insurance ON ExtraCost.InsuranceId = Insurance.InsuranceId
INNER JOIN CarHirePrice ON CarHirePrice.CarHirePriceId= ExtraCost.CarHirePriceId
INNER JOIN Route ON FlightBooking.RouteId = Route.RouteId
SET FlightBooking.TotalCost = (SUM(Section.PriceInflux+Route.RoutePrice+Luggage.Price+SportsEquipment.SportsEquipmentPrice+Insurance.Price+CarHirePrice.TotalPrice))
WHERE FlightBooking.FlightBookingId=1;
When I have it formed as a Select query it returns the correct value so all the tables are fine. I'm assuming my syntax is wrong.
Any help would be appreciated.
You should use the following syntax when using an aggregate in an update statement.
UPDATE t1
SET t1.field = t2.field2Sum
FROM table1 t1
INNER JOIN (select field3, sum(field2) as field2Sum
from table2
group by field3) as t2
on t2.field3 = t1.field3
See Below, I only scripted a few tables but you can see how to do the rest.
UPDATE FlightBooking set TotalCost = (ExtraCost.SumExtra + SumLuggage) From FlightBooking
INNER JOIN Passenger ON Passenger.FlightBookingId=FlightBooking.FlightBookingId
INNER JOIN AirplaneSeat ON AirplaneSeat.AirplaneSeatId = Passenger.SeatId
INNER JOIN Section ON AirplaneSeat.SectionId = Section.SectionId
INNER JOIN (Select FlightBookingId, sum(ExtraCost) as SumExtra from Extracost Group by FlightBookingId) as ExtraCost
ON ExtraCost.FlightBookingId=FlightBooking.FlightBookingId
INNER JOIN (Select FlightBookingId, sum(Price) as SumLuggage from Luggage Group by FlightBookingId) as Luggage
ON Luggage.FlightBookingId=FlightBooking.FlightBookingId
Are you sure that you have multiple records that match a single booking id?
If not, you can dispense with the sum():
SET FlightBooking.TotalCost = (Section.PriceInflux+Route.RoutePrice+Luggage.Price+SportsEquipment.SportsEquipmentPrice+Insurance.Price+CarHirePrice.TotalPrice)
If not, you'll need to pre-aggregate the tables that could generate multiple rows. In fact, you need to do this anyway to get a valid result (Cartesian products generated by joins will throw off the over sum).
many different possibilities for using aggregate funtion with update and inner join
UPDATE flight
SET flight.TotalCost = t.sumPrice
FROM FlightBooking AS flight
INNER JOIN
(
SELECT SUM(Section.PriceInflux+Route.RoutePrice+Luggage.Price+SportsEquipment.SportsEquipmentPrice+Insurance.Price+CarHirePrice.TotalPrice)) as sumPrice
FROM Passenger ON Passenger.FlightBookingId=flight.FlightBookingId
INNER JOIN AirplaneSeat ON AirplaneSeat.AirplaneSeatId = Passenger.SeatId
INNER JOIN Section ON AirplaneSeat.SectionId = Section.SectionId
INNER JOIN ExtraCost ON ExtraCost.FlightBookingId=flight.FlightBookingId
INNER JOIN Luggage ON Luggage.LuggageId = ExtraCost.LuggageId
INNER JOIN SportsEquipment ON ExtraCost.SportsEquipmentId=SportsEquipment.SportsEquipmentId
INNER JOIN Insurance ON ExtraCost.InsuranceId = Insurance.InsuranceId
INNER JOIN CarHirePrice ON CarHirePrice.CarHirePriceId= ExtraCost.CarHirePriceId
INNER JOIN Route ON flight.RouteId = Route.RouteId
) t
WHERE flight.bookingID = 1
also have a look to this examples
PC #PauloSantos and #OMGPonieshttps://stackoverflow.com/a/2009981/4426282
What I have been trying to achieve is to pull a price based on 3 different variables: brand_id, model_id, motor_id.
The design of the tables that I am working with:
The only issue is that when I add an INNER JOIN for databaseapp_lkp_prices I get a zero result set (fyi, there aren't any prices currently set so databaseapp_lkp_prices is an empty table)
I was expecting to see NULL in place of the price for the 48,000 records that exist when I don't add the databaseapp_lkp_prices INNER JOIN
My query is:
SELECT
a.brand,
b.model,
c.motor,
d.ecu_hardware_ver,
d.ecu_software_ver,
d.ecu_software_upg_ver,
d.ecu_brand,
d.ecu_type,
d.eprom,
d.eprom_desc,
d.`checksum`,
d.checksum16,
c.motor_hp * 1.2 AS motor_hp,
e.price,
c.motor_id,
c.model_id,
c.brand_id
FROM
databaseapp_brand AS a
INNER JOIN databaseapp_model AS b ON b.brand_id = a.brand_id
INNER JOIN databaseapp_motor AS c ON b.model_id = c.model_id
INNER JOIN databaseapp_ecu AS d ON d.motor_id = c.motor_id
INNER JOIN databaseapp_lkp_prices AS e ON c.brand_id = e.brand_id AND c.model_id = e.model_id AND c.motor_id = e.motor_id
ORDER BY
a.brand ASC,
b.model ASC
Anyone able to help me out with why I'm getting a zero result set when I try to look up the price.
Cheers!
Inner join requires match. No match no row. You should try LEFT JOIN instead of INNER JOIN for databaseapp_lkp_prices contribution.
FROM (((Project
INNER JOIN MDS ON Project.PID=MDS.PID)
INNER JOIN PLocation ON Project.PID = PLocation.PID)
INNER JOIN Site ON PLocation.ACode = Site.ACode) AS [Prim]
LEFT JOIN ((Procurement INNER JOIN MagicT ON Procurement.PRNum = MagicT.PRNum)
INNER JOIN DO ON DO.DoNum = MagicT.DONum) AS [Prim2] ON Prim.PRNum = Prim2.PRNum
Hey guys. So the above from statement is giving me an error:
Syntax error in from clause
Funny thing is when I make the LEFT JOIN an INNER JOIN it runs fine, but sadly that isn't what I want. I read that I had to rename the inner queries and join them using their new names but unfortunately I do not think I did it properly.
Maybe this... using two inline views. but you should be able to do this with just ()'s in Access... however if you have same named columns in each of Prim/prim2 tables, this will present with errors you may have to spell out each of the column names needed in the inline views.
FROM (SELECT * FROM Project
INNER JOIN MDS ON Project.PID=MDS.PID
INNER JOIN PLocation ON Project.PID = PLocation.PID
INNER JOIN Site ON PLocation.ACode = Site.ACode) PRIM
LEFT JOIN (SELECT * from Procurement
INNER JOIN MagicT ON Procurement.PRNum = MagicT.PRNum
INNER JOIN DO ON DO.DoNum = MagicT.DONum) PRIM2
ON Prim.PRNUM = Prim2.PRNUM
--- maybe... in access the ()'s will handle the outer join but I don't know what table PRNUM is sourced from in (project, mds, plocation,site) so project is a guess...
FROM Project
INNER JOIN MDS ON Project.PID=MDS.PID
INNER JOIN PLocation ON Project.PID = PLocation.PID
INNER JOIN Site ON PLocation.ACode = Site.ACode
LEFT JOIN (SELECT * from Procurement
INNER JOIN MagicT ON Procurement.PRNum = MagicT.PRNum
INNER JOIN DO ON DO.DoNum = MagicT.DONum) PRIM2
ON Project.PRNUM = Prim2.PRNUM
You basically have
FROM Subquery1 LEFT JOIN Subquery2
but your subqueries don't have SELECT in them.
I think it should be:
FROM
(SELECT Prim.PRNum FROM
(((Project
INNER JOIN MDS ON Project.PID=MDS.PID)
INNER JOIN PLocation ON Project.PID = PLocation.PID)
INNER JOIN Site ON PLocation.ACode = Site.ACode)
AS [Prim])
LEFT JOIN
(SELECT Prim2.PRNum FROM
((Procurement INNER JOIN MagicT ON Procurement.PRNum = MagicT.PRNum)
INNER JOIN DO ON DO.DoNum = MagicT.DONum)
AS [Prim2])
ON Prim.PRNum = Prim2.PRNum
(edit: a little too late...)
I have also discovered one of my issues here, is that in Access, you can have a left or right join nested inside an inner join but CANNOT have an inner join inside a left or right join. Rewriting the query to not include these joins inside the inner joins has solved the issue.
Thank you for all the help.
I have the following schema.
I can run two queries fairly simply
select * from booking_model_assignment
join booking_model on booking_model_assignment.booking_model_id = booking_model.id
left outer join axis_channel_mappings on bmi_id = axis_channel_mappings.assignment_id
left outer join axis_revenue_stream_mappings on bmi_id = axis_revenue_stream_mappings.assignment_id
which will give me all of the combinations of channel mappings and 'revenue_stream_mappings' which fit a booking model, with Null if there is one which only matches in one of the tables.
The other query
select * from axis_channel join axis_revenue_stream
Gives all of the possible combinations of channels and revenue streams.
What I would like is a query which will give all of the combinations, and the booking_model if that combination matches.
Any time I try to join or subquery I seem to get too many, or too few results. I think the issue is that I want the assignment_id to match across outer joins but only if there is an outer join.
The schema is laid out like this so it will be possible to add new axis and fit models to combinations, so if there is an easier way to achieve this I would be open to changing the schema.
EDIT
I have a partial solution based on Eggyal's answer but it is not extendable.
SELECT c.*, r.*, GROUP_CONCAT(a.bmi_id), GROUP_CONCAT(b.name) AS booking_models
FROM axis_channel c
CROSS JOIN axis_revenue_stream r
LEFT JOIN axis_channel_mappings cm ON cm.channel_id = c.id
LEFT JOIN axis_revenue_stream_mappings rm ON rm.revenue_stream_id = r.id
LEFT JOIN booking_model_assignment a ON (a.bmi_id = cm.assignment_id
AND a.bmi_id = rm.assignment_id)
OR (a.bmi_id = cm.assignment_id
AND rm.assignment_id IS NULL)
OR (cm.assignment_id IS NULL
AND a.bmi_id = cm.assignment_id)
LEFT JOIN booking_model b ON b.id = a.booking_model_id
GROUP BY c.id, r.id
But if I were to add more axes this query would grow way to cumbersome.
SELECT c.*, r.*, GROUP_CONCAT(b.name) AS booking_models
FROM axis_channel c
CROSS JOIN axis_revenue_stream r
LEFT JOIN axis_channel_mappings cm ON cm.channel_id = c.id
LEFT JOIN axis_revenue_stream_mappings rm ON rm.revenue_stream_id = r.id
LEFT JOIN booking_model_assignment a ON a.bmi_id = cm.assignment_id
AND a.bmi_id = rm.assignment_id
LEFT JOIN booking_model b ON b.id = a.booking_model_id
GROUP BY c.id, r.id
I have a MySQL JOIN query where 2 tables are joined to get the output
select distinct (a.error_type),a.links_id, a.crawl_cycle , b.* from $table a inner join crawler_error_type b on a.error_type = b.error_type where a.projects_id = '$pid' and b.error_priority_page_level='High'
Now I want to check if the value of the field error_type is present in the third table. If it is present then it shouldn't give me the resulted row.
Add the below:
LEFT OUTER JOIN third_table c ON c.error_type = a.error_type
and
WHERE c.error_type is null
LEFT OUTER JOIN will display all the records from a table joining on third_table. Since you do not want the record with matching error type from third_table, use WHERE c.error_type is null
You need to add one more INNER JOIN on third_table as:
SELECT DISTINCT a.error_type, a.links_id, a.crawl_cycle , b.*
FROM $table a
INNER JOIN crawler_error_type b
ON a.error_type = b.error_type
INNER JOIN third_table c
ON a.error_type = c.error_type
WHERE a.projects_id = '$pid' AND
b.error_priority_page_level='High'.
If I understand it correctly, you should just be able to inner join the third table. Inner joins will on show the record if they have records in the joining tables. If I am misunderstanding could you please elaborate. Thx
select distinct (a.error_type),a.links_id, a.crawl_cycle , b.*
from $table a
inner join crawler_error_type b on a.error_type = b.error_type
inner join some_table_3 c on c.error_type = a.error_type
where a.projects_id = '$pid' and b.error_priority_page_level='High'