Sorry for the lack of experience in advance.
I have cleansed my diagnostics table and want extract just the rows from followup questions that share the same string in both the AssetType and RepairType columns as the diagnostics table.
Is there a statement or join I can do that will bring back those results?
What you can do is perform an inner join from diagnostics to followupquestions:
SELECT * FROM
Diagnostics D
INNER JOIN
FollowupQuestions F
ON
D.AssetType = F.AssetType
AND
D.RepairType = F.RepairType
An inner join will only return rows where the ON condition is met.
Related
I have 3 tables, CASES, REPORTS and REPORT_DETAIL
My current report shoes all REPORTS where there is a matching CASE. This is accomplished by
SELECT * FROM CASES
JOIN REPORTS
WHERE CASES.ID = REPORTS.ID
I am looking to extend this to now show additional report detail if it is available. So show the same report, but if there is any report detail available, then tag that on the end. I have tried a series of LEFT and RIGHT JOINS but am not getting the required dataset.
Could it be that I need to to the RIGHT JOIN once the rest of the SQL has run, and that the SQL is getting confused with where the JOIN should be?
I have tried the following but have not managed to get it to work.
SELECT * FROM CASES
JOIN REPORTS ON CASES.ID = REPORTS.ID
RIGHT JOIN REPORT_DETAIL ON REPORTS.DETAILID = REPORT_DETAIL.DETAILID
I think you want LEFT JOIN:
SELECT *
FROM CASES C JOIN
REPORTS R
ON C.ID = R.ID LEFT JOIN
REPORT_DETAIL RD
ON R.DETAILID = RD.DETAILID;
This keeps all rows returned by the first JOIN, along with additional columns from any matching REPORT_DETAIL records.
I have 7 Tables as per attached following Image.
I will either enter Engine Number or Chassis Number and it should show the respective tables information (these tables have only mentioned fields) so all fields can be shown as result.
I can use hard coded Engine Number or Chassis Number. Every time of execution of this Query, I will hard code the required Engine/Chassis Number and will get the result.
Can anybody please help me to write this query for me?
Click Here to See the Tables
This might be a starting point for your solution.
SELECT prod.EngineNo AS engNo, prod.ChassisNo, doral.doralNo [, table.column [AS name]]
FROM DOProductSpecsDetais AS prod
INNER JOIN DORAL AS doral
ON prod.DOProductSpecsDetailID = doral.DOProductSpecsID
INNER JOIN DOProductDetail AS prodDetail
ON prod.DOProductDetailID = prodDetail.DOProductDetailID
WHERE prod.ChassisNo = '<input>' OR prod.EngineNo='<input>'
Between the SELECT and the FROM Statement, you can select any column out of your JOIN.
You can cascade as many JOINs as you like...
Which DBMS are you going to use?
One suggestion: Try to simplify the names of your columns, if possible.
One more: If you just started to do Database things, it is always helpful to start a test environment and use a client tool.
You can write query something like this:
select * from
DoProductSpecsDetail tbl1 inner join Doral tbl2
on tbl1.DoProductSpecsDetailId = tbl2.DoProductSpecsId
inner join DoproductDetail tbl3
on tbl1.DoProductDetailId = tbl3.DoProductDetailId
inner join ProductColor tbl4
on tbl1.ProductColorId = tbl4.ProductColorId
inner join DoDetail tbl5
on tbl3.DeliveryOrderDetailId = tbl5.DeliveryOrderId
inner join ProductMain tbl6
on tbl3.ProductId = tbl6.ProductId
inner join BPMain tbl7
on tbl5.BusinessPartnerId = tbl7.BusinessPartnerId
Please bear with me as this may be a question without a possible answer, but I hope I describe it correctly..
I have a query which joins a number of tables and produces results, and here is the SQL:
SELECT
dbo.Property.PropertyPK,
dbo.Tenancy.TenancyPK,
dbo.Tenant.ContactFK,
dbo.Contacts.strTitle,
dbo.Contacts.strFirstName,
dbo.Contacts.strSurname
FROM dbo.Property
INNER JOIN dbo.Tenancy ON dbo.Property.PropertyPK = dbo.Tenancy.PropertyFK
INNER JOIN dbo.Tenant ON dbo.Tenancy.TenancyPK = dbo.Tenant.TenancyFK
INNER JOIN dbo.Contacts ON dbo.Tenant.ContactFK = dbo.Contacts.ContactPK
The main table is the Property table and I filter out one row by specifying a PropertyPK in my criteria..
My question is.. If the Tenant or Contact record does not exist and I run my query in SQL Management Studio of course I get a message saying there are no rows but can I determine at what stage the join has failed between two tables?
I can of course check this in management studio but I am trying to help the user on the application side to inform them of why there are no rows. My application is in VB and I will write that check if there are no rows and I cannot determine it in SQL..
Sorry for the question in advance..
Derek.. :)
Simply use a LEFT JOIN:
SELECT p.PropertyPK, ty.TenancyPK, t.ContactFK,
c.strTitle, c.strFirstName, c.strSurname
FROM dbo.Property p LEFT JOIN
dbo.Tenancy ty
ON p.PropertyPK = ty.PropertyFK LEFT JOIN
dbo.Tenant t
ON ty.TenancyPK = t.TenancyFK LEFT JOIN
dbo.Contacts c
ON t.ContactFK = c.ContactPK;
This will keep all rows in the Property table. You can then see which primary keys are NULL to see if there were matches in the other tables.
Note that the query is much easier to write and to read when you use table aliases.
SELECT
dealing_record.*
,shares.*
,transaction_type.*
FROM
shares
INNER JOIN shares ON shares.share_ID = dealing_record.share_id
INNER JOIN transaction_type ON transaction_type.transaction_type_id = dealing_record.transaction_type_id;
The above SQL code produces the desired output but with a couple of duplicate columns. Also, with incomplete display of the column headers. When I change the
linesize 100
the headers shows but data displayed overlaps
I have checked through similar questions but I don't seem to get how to solve this.
You have duplicate columns, because, you're asking to the SQL engine for columns that they will show you the same data (with SELECT dealing_record.* and so on) , and then duplicates.
For example, the transaction_type.transaction_type_id column and the dealing_record.transaction_type_id column will have matching rows (otherwise you won't see anything with an INNER JOIN) and you will see those duplicates.
If you want to avoid this problem or, at least, to reduce the risk of having duplicates in your results, improve your query, using only the columns you really need, as #ConradFrix already said. An example would be this:
SELECT
dealing_record.Name
,shares.ID
,shares.Name
,transaction_type.Name
,transaction_type.ID
FROM
shares
INNER JOIN shares ON shares.share_ID = dealing_record.share_id
INNER JOIN transaction_type ON transaction_type.transaction_type_id = dealing_record.transaction_type_id;
Try to join shares with dealing_record, not shares again:
select dealing_record.*,
shares.*,
transaction_type.*
FROM shares inner join dealing_record on shares.share_ID = dealing_record.share_id
inner join transaction_type on transaction_type.transaction_type_id=
dealing_record.transaction_type_id;
Ok.. So I'm trying to improve my SQL skills and have a question. Here is a screen shot of the schema.
Schema http://img509.imageshack.us/img509/97/screenhunter02nov121946.gif
(http://img509.imageshack.us/img509/97/screenhunter02nov121946.gif)
Alright so I'm selecting a bunch of Report Bundles and other rows from a table you can see. I've got these two tables joining together correctly and displaying what should be returned. Now I need to add another field onto my result rows that states what type of report this is. How can I join up to the ReportGroupType table through the ReportBundleGroup table without getting a shwack of results?
Here is the query I am using so far.
SELECT *
FROM ReportBundleCustomerVisibility INNER JOIN ReportBundle
ON ReportBundleCustomerVisibility.ReportBundleID = ReportBundle.ID
WHERE ReportBundleCustomerVisibility.ReferenceCustomerID = 2303
Thanks again SO
SELECT *
FROM ReportBundleCustomerVisibility AS v
JOIN ReportBundle AS b ON b.ID = v.ReportBundleID
JOIN ReportBundleGroup AS g ON b.ID = g.ReportBundleID
JOIN ReportGroupTYpe AS t ON t.ID = g.ReportGroupTypeID
WHERE v.ReferenceCustomerID = 2303
It sounds like you just need another inner join to get the information you need. You can think about the second join as joining the result of the join with the ReportGroupType table. I added parenthesis to try to join the two sets the second INNER JOIN is operating on.
SELECT * FROM ((ReportBundleCustomerVisibility
INNER JOIN ReportBundle ON ReportBundleCustomerVisibility.ReportBundleID = ReportBundle.ID)
INNER JOIN ReportGroupType ON ReportBundleGroup.ReportGroupTypeID = ReportGroupType.ID)
WHERE ReportBundleCustomerVisibility.ReferenceCustomerID = 2303
I also highly suggest against using "SELECT *" in production code or any query you plan on reusing as the table schema can change and possibly effect reports and UI. Explicitly specify the columns instead.