This code shows me the results based on two tables
SELECT h.Destino, g.Fuente
FROM Hist_LDS h, gTronco g
WHERE h.Fecha='2020-10-28'
AND g.Tronco = h.Tronco
The Destinos are 19 and then it repeat, i need to only apeers one time, and count the time od appereance to. I need to create a new table when insted of the information in the variable Tronco I put the Destino and Fuente
What you are doing is a CROSS JOIN.
And what you probably want is a simple INNER JOIN. Not very clear from your question, also check LEFT/RIGHT JOIN.
SELECT h.Destino, g.Fuente
FROM Hist_LDS h
INNER JOIN gTronco g ON g.Tronco = h.Tronco
WHERE h.Fecha='2020-10-28'
Related
I made a query and wanted to not have any duplicates but i got some times 3 duplicates and when i used DISTINCT or DISTINCTROW i got only 2 duplicates.
SELECT f.flight_code,
f.status,
a.airport_name,
a1.airport_name,
f.departing_date+f.departing_time AS SupposedDepartingTime,
f.landing_date+f.landing_time AS SupposedLandingTime,
de.actual_takeoff_date+de.actual_takeoff_time AS ActualDepartingTime,
SupposedLandingTime+(ActualDepartingTime-SupposedDepartingTime) AS ActualLandingTime
FROM
(((Flights AS f
LEFT JOIN Aireports AS a
ON a.airport_code = f.depart_ap)
LEFT JOIN Aireports AS a1
ON f.target_ap = a1.airport_code)
LEFT JOIN Irregular_Events AS ie
ON f.flight_code = ie.flight_code)
LEFT JOIN Delay_Event AS de
ON ie.IE_code = de.delay_code;
had to use LEFT JOIN because when i used INNER JOIN i missed some of the things i wanted to show because i wanted to see all the flights and not only the flights that got delayed or canceled.
This is the results when i used INNER JOIN, you can see only the flights that have the status "ביטול" or "עיכוב" and that is not what i wanted.
[the results with LEFT JOIN][2]
[2]: https://i.stack.imgur.com/cgE2G.png
and when i used DISTINCT where you see the rows with the NUMBER 6 on the first column it appear only two times
IMPORTANT!
I just checked my query and all the tables i use there and i saw my problem but dont know how to fix it!
in the table Irregular_Events i have more the one event for flights 3,6 and 8 and that is why when i use LEFT JOIN i see more even thou i use distinct, please give me some help!
Not entirely sure without seeing the table structure, but this might work:
SELECT f.flight_code,
f.status,
a.airport_name,
a1.airport_name,
f.departing_date+f.departing_time AS SupposedDepartingTime,
f.landing_date+f.landing_time AS SupposedLandingTime,
de.actual_takeoff_date+de.actual_takeoff_time AS ActualDepartingTime,
SupposedLandingTime+(ActualDepartingTime-SupposedDepartingTime) AS ActualLandingTime
FROM
((Flights AS f
LEFT JOIN Aireports AS a
ON a.airport_code = f.depart_ap)
LEFT JOIN Aireports AS a1
ON f.target_ap = a1.airport_code)
LEFT JOIN
(
SELECT
ie.flight_code,
de1.actual_takeoff_date,
de1.actual_takeoff_time
FROM
Irregular_Events ie
INNER JOIN Event AS de1
ON ie.IE_code = de1.delay_code
) AS de
ON f.flight_code = de.flight_code
It is hard to tell what is the problem with your query without any sample of the output, and without any description of the structure of your tables.
But your problem is that your are querying from the flights table, which [I assume] can be linked to multiple irregular_events, which can possibly also be linked to multiple delay_event.
If you want to get only one row per flight, you need to make sure your joins return only one row too. Maybe you can do it by adding one more condition to the join, or by adding a condition in a sub-query.
EDIT
You could try to add a GROUP BY to the query:
GROUP BY
f.flight_code,
f.status,
a.airport_name,
a1.airport_name;
I am having a problem with my SQL query using the count function.
When I don't have an inner join, it counts 55 rows. When I add the inner join into my query, it adds a lot to it. It suddenly became 102 rows.
Here is my SQL Query:
SELECT COUNT([fmsStage].[dbo].[File].[FILENUMBER])
FROM [fmsStage].[dbo].[File]
INNER JOIN [fmsStage].[dbo].[Container]
ON [fmsStage].[dbo].[File].[FILENUMBER] = [fmsStage].[dbo].[Container].[FILENUMBER]
WHERE [fmsStage].[dbo].[File].[RELATIONCODE] = 'SHIP02'
AND [fmsStage].[dbo].[Container].DELIVERYDATE BETWEEN '2016-10-06' AND '2016-10-08'
GROUP BY [fmsStage].[dbo].[File].[FILENUMBER]
Also, I have to do TOP 1 at the SELECT statement because it returns 51 rows with random numbers inside of them. (They are probably not random, but I can't figure out what they are.)
What do I have to do to make it just count the rows from [fmsStage].[dbo].[file].[FILENUMBER]?
First, your query would be much clearer like this:
SELECT COUNT(f.[FILENUMBER])
FROM [fmsStage].[dbo].[File] f INNER JOIN
[fmsStage].[dbo].[Container] c
ON v.[FILENUMBER] = c.[FILENUMBER]
WHERE f.[RELATIONCODE] = 'SHIP02' AND
c.DELIVERYDATE BETWEEN '2016-10-06' AND '2016-10-08';
No GROUP BY is necessary. Otherwise you'll just one row per file number, which doesn't seem as useful as the overall count.
Note: You might want COUNT(DISTINCT f.[FILENUMBER]). Your question doesn't provide enough information to make a judgement.
Just remove GROUP BY Clause
SELECT COUNT([fmsStage].[dbo].[File].[FILENUMBER])
FROM [fmsStage].[dbo].[File]
INNER JOIN [fmsStage].[dbo].[Container]
ON [fmsStage].[dbo].[File].[FILENUMBER] = [fmsStage].[dbo].[Container].[FILENUMBER]
WHERE [fmsStage].[dbo].[File].[RELATIONCODE] = 'SHIP02'
AND [fmsStage].[dbo].[Container].DELIVERYDATE BETWEEN '2016-10-06' AND '2016-10-08'
I am trying to make a summary table of all the items I have. I have a raw data table with 10 users who respectively have different items. There are maximum 3 different items and I want to do a count to see how many items each individual has. The following is my code.
Select b.Country,b.UserID,Num_including_fruits, Apple,Orange
from
(((SELECT o.Country,o.UserID, IIF(ISNULL(Count(o.UserID)),0,Count(o.UserID))
AS Num_including_fruits
FROM [SEA2_View] as o
GROUP BY o.UserID, o.Country
ORDER BY Country)as b
LEFT JOIN
(SELECT o.Country,o.UserID,IIF(ISNULL(Count(o.UserID)),0,Count(o.UserID)
AS Apple
FROM [APAC2_View] as o
WHERE o.fruit_status <>"fresh" AND o.HWType = "Apple"
GROUP BY o.Country,o.UserID)as d
ON (b.UserID = d.UserID))
LEFT JOIN
(SELECT o.Country,o.UserID,IIF(ISNULL(Count(o.UserID)),0,Count(o.UserID))
AS Orange
FROM [SEA2_View] as o
WHERE o.fruit_status <>"fresh" AND o.HWType = "Orange"
GROUP BY o.Country,o.UserID)as e
ON (d.UserID = e.UserID))
;
The first join returns the correct result but the second join somehow returns all 0, which is incorrect. Therefore please help! and I would appreciate any advice for best practice when it comes to joins in SQL. Thanks lot!
Are you sure you don't have a table naming error?
You're first joining [SEA2_View] with [APAC2_View]. The second join is joining with [SEA2_View] with itself.
I have this code:
select Users.phoneMac, Users.apMac, Locations.Lon, Locations.Lat
from Locations, Users
inner join (
select u.phoneMac, max(u.strenght) as most
from Users u, Locations l
where u.apMac = l.apMac
group by u.phoneMac
) as ij on ij.phoneMac=Users.phoneMac and Users.strenght = ij.most
where Locations.apMac = Users.apMac;
It worked for me fine but when I added more data to users table this query calculated results from all the data and I wanted to get results just from latest data. So I added timestamp to Users table.
So can you help me fix this code so it first take only data from latest timestamp for every user(users.phoneMac)(there can be more then 1 row of data for same phoneMac) and then do the rest of calculations.
You're already picking the max value of the "strenght" field and joining on that, so why not use the same approach again for your timestamp field? Something like:
SELECT Users.phoneMac, Users.apMac, Locations.Lon, Locations.Lat
FROM Locations
INNER JOIN Users
ON Users.apMac = Locations.apMac
INNER JOIN (
SELECT u.phoneMac, max(u.strenght) AS most
FROM Locations l
INNER JOIN Users u ON u.apMac = l.apMac
GROUP BY u.phoneMac) AS ij
ON ij.phoneMac = Users.phoneMac
AND Users.strenght = ij.most
INNER JOIN (
SELECT u2.phoneMac, max(u2.timestampfield) AS latest
FROM Locations l2
INNER JOIN Users u2 ON u2.apMac = l2.apMac
GROUP BY u2.phoneMac) AS ijk
ON ijk.phoneMac = Users.phoneMac
AND Users.timestampfield = ij.latest;
(By the way, using the old join syntax with comma and the WHERE clause makes it harder to understand the logic, and occasionally makes the logic wrong. The new join syntax with ON is really a lot better.)
select maintitle,
firstprodyear,
COUNT(DISTINCT episode.episodeid) as TOTALEPISODES
from series
LEFT OUTER JOIN episode ON series.seriesid = episode.seriesid
LEFT OUTER JOIN filmitem ON filmitem.filmid = episode.episodeid
where firstprodyear =(select MIN(firstprodyear) from series)
group by maintitle, firstprodyear;
2/3s of the query works. I do get the title of the serie and earliest year. But it seems like the episode counter isn't working properly. For some episode I do get 15, 34 and somewhere 0.
I would preciate for some guidance to make the episodecounter work as it should. Where have I missed?
Try:
select maintitle,
min(firstprodyear) firstprodyear,
COUNT(DISTINCT episode.episodeid) as TOTALEPISODES
from series
LEFT OUTER JOIN episode ON series.seriesid = episode.seriesid
/*LEFT OUTER JOIN filmitem ON filmitem.filmid = episode.episodeid */
group by maintitle;
Note: the link to filmitem appears to be unnecessary with the data selected.
Your query is returning the series that have firstprodyear equal to the earliest firstprodyear in the your database. You can think of the sub-select statement as returning a fixed number that is then used in the query.
For example, if the earliest series in your database is Days of Our Lives (firstprodyear = 1965), then you will get back the number of episodes in those series that also started in 1965.
You may also want to be more explicit about which table actually contains the firstprodyear field, though I'm assuming it's series.