I have a question concerning MS Access queries involving these tables:
tblMIDProcessMain ={ Process_ID,Process_Title,...}
tblMIDProcessVersion = { ProcessVersion_ID, ProcessVersion_FK_Process, ProcessVersion_VersionNo, ProcessVersion_FK_Status, ...}
tblMIDProcessVersionStatus = { ProcessVersionStatus_ID,ProcessVersionStatus_Value }
The tables store different versions of a process description. The "ProcessVersion_VersionNo" field contains an integer providing the version number. Now I would like to get for each process the highest version number thus the current version. If I do the following it kind of works:
SELECT tblMIDProcessMain.Process_Titel
, Max(tblMIDProcessVersion.ProcessVersion_VersionNo) AS CurrentVersion
FROM tblMIDProcessMain
INNER JOIN tblMIDProcessVersion
ON tblMIDProcessMain.Process_ID = tblMIDProcessVersion.ProcessVersion_FK_Process
GROUP BY tblMIDProcessMain.Process_Titel;
The query returns a recordset with each existing process_title and the respective max number of the version field. But as soon as I add other fields like "ProcessVersion_FK_Status" in the Select statement the query stops working.
Any help would be appreciated. Thanks in advance.
Jon
Edit:
To clarify things a little I added a simplified example
Parent-Table:
Process_ID | Process_Title
----------------------------------
1 | "MyProcess"
2 | "YourProcess"
Child-Table:
Version_ID | Version_FK_ProcessID | Version_No | Version_Status
---------------------------------------------------------------------------
1 | 1 | 1 | "New"
2 | 2 | 1 | "Discarded"
3 | 2 | 2 | "Reviewed"
4 | 2 | 3 | "Released"
Intended Result:
Title | Max_Version_No | Status
--------------------------------------------------------
MyProcess | 1 | "New"
YourProcess | 3 | "Released"
Given the example tables you updated your post with, this should work:
select process_title as Title
, max_version.max_version_no
, c.version_status as status
from (parenttable p
inner join (select max(version_id) as max_version_no, version_fk_process_id from childtable group by version_fk_process_id) max_version
on p.process_id = max_version.version_fk_process_id)
inner join childtable c
on max_version.max_version_no = c.version_id and max_version.version_fk_process_id = c.version_fk_process_id
I assume you are adding the new field to the 'Group By" clause? If not, then you either must include in the 'Group By', or you must use one of the operators like "Max" or "First" etc.
Related
Being pretty new to SQL, I ask for your patience. I have been banging my head trying to figure out how to create this VIEW by joining 3 tables. I am going to use mock tables, etc to keep this very simple. So that I can try to understand the answer - no just copy and paste.
ICS_Supplies:
Supplies_ ID Item_Description
-------------------------------------
1 | PaperClips
2 | Rubber Bands
3 | Stamps
4 | Staples
ICS_Orders:
ID SuppliesID RequisitionNumber
----------------------------------------------------
1 | 1 | R1234a
6 | 4 | R1234a
2 | 1 | P2345b
3 | 2 | P3456c
4 | 3 | R4567d
5 | 4 | P5678e
ICS_Transactions:
ID RequsitionNumber OrigDate TransType OpenClosed
------------------------------------------------------------------
1 | R1234a | 06/12/20 | Req | Open
2 | P2345b | 07/09/20 | PO | Open
3 | P3456c | 07/14/20 | PO | Closed
4 | R4567d | 08/22/20 | Req | Open
5 | P5678e | 11/11/20 | PO | Open
And this is what I want to see in my View Results
Supplies_ID Item RequsitionNumber OriginalDate TransType OpenClosed
---------------------------------------------------------------------------------------
1 | Paper Clips | P2345b | 07/09/20 | PO | OPEN
2 | Rubber Bands | Null | Null | Null | Null
3 | Stamps | Null | Null | Null | Null
4 | Staples | P56783 | 11/11/20 | PO | OPEN
I just can't get there. I want to always have the same amount of records that we have in the ICS_Supplies Table. I need to join to the ICS_Orders Table in order to grab the Requisition Number because that's what I need to join on the ICS_Transactions Table. I don't want to see data in the new added fields UNLESS ICS_Transactions.TransType = 'PO' AND ICS_Transactions.OpenClosed = 'OPEN', otherwise the joined fields should be seen as null, regardless to what they contain. IF that is possible?
My research shows this is probably a LEFT Join, which is very new to me. I had made many attempts on my own, and then posted my question yesterday. But I was struggling to ask the correct question and it was recommended by other members that I post the question again . .
If needed, I can share what I have done, but I fear it will make things overly confusing as I was going in the wrong direction.
I am adding a link to the original question, for those that need some background info
Original Question
If there is any additional information needed, just ask. I do apologize in advance if I have left out any needed details.
This is a bit tricky, because you want to exclude rows in the second table depending on whether there is a match in the third table - so two left joins are not what you are after.
I think this implements the logic you want:
select s.supplies_id, s.item_description,
t.requisition_number, t.original_date, t.trans_type, t.open_closed
from ics_supplies s
left join ics_transaction t
on t.transtype = 'PO'
and t.open_closed = 'Open'
and exists (
select 1
from ics_order o
where o.supplies_id = s.supplies_id and o.requisition_number = t.requisition_number
)
Another way to phrase this would be an inner join in a subquery, then a left join:
select s.supplies_id, s.item_description,
t.requisition_number, t.original_date, t.trans_type, t.open_closed
from ics_supplies s
left join (
select o.supplies_id, t.*
from ics_order o
inner join ics_transaction t
on t.requisition_number = o.requisition_number
where t.transtype = 'PO' and t.open_closed = 'Open'
) t on t.supplies_id = s.supplies_id
This query should return the data for supplies. The left join will add in all orders that have a supply_id (and return null for the orders that don't).
select
s.supplies_id
,s.Item_Description as [Item]
,t.RequisitionNumber
,t.OrigDate as [OriginalDate]
,t.TransType
,t.OpenClosed
from ICS_Supplies s
left join ICS_Orders o on o.supplies_id = s.supplies_id
left join ICS_Transactions t on t.RequisitionNumber = o.RequisitionNumber
where t.TransType = 'PO'
and t.OpenClosed = 'Open'
The null values will automatically show null if the record doesn't exist. For example, you are joining to the Transactions table and if there isn't a transaction_id for that supply then it will return 'null'.
Modify your query, run it, then maybe update your question using real examples if it's possible.
In the original question you wrote:
"I only need ONE matching record from the ICS_Transactions Table.
Ideally, the one that I want is the most current
'ICS_Transactions.OriginalDate'."
So the goal is to get the most recent transaction for which the TransType is 'PO' and OpenClosed is 'Open'. That the purpose of the CTE 'oa_cte' in this code. The appropriate transactions are then LEFT JOIN'ed on SuppliesId. Something like this
with oa_cte(SuppliesId, RequsitionNumber, OriginalDate,
TransType, OpenClosed, RowNum) as (
select o.SuppliesId, o.RequsitionNumber,
t.OrigDate, t.TransType, t.OpenClosed,
row_number() over (partition by o.SuppliesId
order by t.OrigDate desc)
from ICS_Orders o
join ICS_Transactions t on o.RequisitionNumber=t.RequisitionNumber
where t.TransType='PO'
and t.OpenClosed='OPEN')
select s.*, oa.*
from ICS_Supplies s
left join oa_cte oa on s.SuppliesId=oa.SuppliesId
and oa.RowNum=1;
Title might be confusing.
I have a table of Cases, and each Case can contain many Tasks. To achieve a different workflow for each Task, I have different tables such as Case_Emails, Case_Calls, Case_Chats, etc...
I want to build a Query that will eventually be exported to Excel. In this query, I want to list out each Task, and the Tasks are already joined together via a UNION in another table using a common format. For each task in the Query, I want only the first Task associated with a case to include the details from Cases table. Example below:
+----+---------+------------+-------------+-------------+-------------+
| id | Case ID | Agent Name | Task Info 1 | Task Info 2 | Task Info 3 |
+----+---------+------------+-------------+-------------+-------------+
| 1 | 4000000 | Some Name | Detailstuff | Stuffdetail | Thingsyo |
| 2 | | | Detailstuff | Stuffdetail | Thingsyo |
| 3 | | | Detailstuff | Stuffdetail | Thingsyo |
| 4 | 4000003 | Some Name | Detailstuff | Stuffdetail | Thingsyo |
| 5 | | | Detailstuff | Stuffdetail | Thingsyo |
| 6 | 4000006 | Some Name | Detailstuff | Stuffdetail | Thingsyo |
+----+---------+------------+-------------+-------------+-------------+
My original approach was attempting a LEFT JOIN on Case ID, but I couldn't figure out how to filter the data out from the extra rows.
This would be much simpler if Access supported the ROW_NUMBER function. It doesn't, but you can sort of simulate it with a correlated subquery using the Tasks table (this assumes that each task has a unique numeric ID). This basically assigns a row number to each task, partitioned by the CaseID. Then you can just conditionally display the CaseID and AgentName where RowNum = 1.
SELECT Switch(RowNum = 1, CaseID) as Case,
Switch(RowNum = 1, AgentName) as Agent,
TaskName
FROM (
SELECT c.CaseID,
c.AgentName,
t.TaskName,
(select count(*)
from Tasks t2
where t2.CaseID = c.CaseID and t2.ID <= t.ID) as RowNum
FROM Cases c
INNER JOIN Tasks t ON c.CaseID = t.CaseID
order by c.CaseID, t.TaskName
)
You didn't post your table structure, so I'm not sure this will work for you as-is, but maybe you can adapt it.
No matter what when you join you will have duplicate values. to remove the duplicates either put in a Distinct in your select or a Group by after your filters. This should resolve the duplicates in you query for task info 1,2,3.
Found out that I can name my tables in the query like so:
FROM Case_Calls Calls
With this other name, I was able to filter based on a sub query:
IIF( Calls.[ID] <> (select top 1 [ID] from Case_Calls where [Case ID] = Calls.[Case ID]), '', Cases.[Creator]) As [Case Creator]
This solution gives me the results that I want :) It's rather ugly SQL, and difficult to parse when I'm dealing with dozens of columns, but it gets the job done!
I'm still curious if there is a better solution...
Closed. This question needs debugging details. It is not currently accepting answers.
Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question.
Closed 6 years ago.
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I have 2 tables.
Contacts
+----+------+
| ID | Tier |
+----+------+
| 1 | Low |
| 2 | High |
| 3 | Max |
+----+------+
Events
+----+-----------+-----------+
| ID | EventType | GroupType |
+----+-----------+-----------+
| 1 | Open | A |
| 2 | Open | A |
| 3 | Open | A |
| 1 | Delete | B |
| 2 | Open | B |
| 3 | Open | B |
| 1 | Open | A |
| 3 | Open | C |
+----+-----------+-----------+
If Events contains 2 unique GroupTypes where EventType = 'Open' then the associated Contact record needs to be updated to a Tier of 'High', else if there are more than 2 I need to update to 'Max', else if there are fewer I need to update to 'Low'. (The above table shows correct tiers)
When attempting the below, I get "Error near Group". Can I group while updating? Is there a better way to get these results?
Update c
SET c.Tier = (CASE WHEN count(DISTINCT(e.GroupType)) > 2 THEN 'Max'
WHEN count(DISTINCT(e.GroupType)) = 2 THEN 'High'
ELSE 'Low'
END)
FROM Contacts c JOIN Events e on c.ID = e.ID
WHERE e.EventType = 'Open'
GROUP BY c.ID
You can't group by in your update statement. You just need to form the query separately that will give you the rows you need to update and join on that. You are updating based on ID, and the value you are setting depends on the number of open events for that ID, so form a query finding the number of open events by id:
-- query open event counts by contact id
SELECT ID, COUNT(*) AS OpenEventCount
FROM Events
WHERE EventType = 'Open'
GROUP BY ID
Now it's simple to link that to contacts and update:
UPDATE c
SET c.Tier = CASE
WHEN COALESCE(ec.OpenEventCount, 0) > 2 then 'Max'
WHEN COALESCE(ec.OpenEventCount, 0) = 2 then 'High'
ELSE 'Low'
END
FROM Contacts c
LEFT OUTER JOIN ( -- left join to update contacts with no open events
SELECT ID, COUNT(*) AS OpenEventCount
FROM Events
WHERE EventType = 'Open'
GROUP BY ID
) ec ON ec.ID = c.ID
This is exactly what VIEW is for in SQL.
You can make it an indexed view, if necessary.
As a concept, try to minimize data dependancy between tables; foreign keys are ok, but if you need data from this table to mtach data from a different table, use views (or calculayed columns) and not hard core UPDATED.
I am really new to SQL, and want to compare two values from two users: For example, the value for the first user at field_id=3, and the value for the second user at field_id=6. The table looks as follows:
+----------+---------+-------+
| field_id | user_id | value |
+----------+---------+-------+
| 1 | 1 | Name1 |
| 2 | 1 | Man |
| 3 | 1 | Woman |
| 1 | 2 | Name2 |
| 2 | 2 | Woman |
| 3 | 2 | Man |
+----------+---------+-------+
This check, I'm looking for, needs to become part of the following sql statement:
$sql = "SELECT MIN(us.ID) FROM ".$wpdb->base_prefix."users us"
. " JOIN ".$wpdb->base_prefix."bp_xprofile_data bp ON us.ID = bp.user_id"
. " JOIN ". $wpdb->base_prefix . "usermeta um ON um.user_id = us.ID"
. " WHERE um.meta_key = 'last_activity' AND us.ID > $current_id"
. " AND ?????????? What to insert here to compare?????"
The check, whether the value for field_id=2 and user_id=1 equals the value of field_id=3 and user_id=2, needs to replace above statement's ?????????? What to insert here to compare?????.
This query is called from php.
The plain comparison could be done like
SELECT
'match' AS result
FROM us_user U1
JOIN us_user U2
ON U1.value = U2.value
AND U1.field_id = 2
AND U1.user_id = 1
AND U2.field_id = 3
AND U2.user_id = 2
;
The exact 'return value' (I picked match, could be 1) is free for you to choose (and does not really need a column alias - as long as your database is easy about it).
See this in action: SQL Fiddle
This could then be made a subquery to be included into your original statement along
... AND EXISTS (suggested-query-goes-here)
You will most likely need to synch at least one of the tables in the suggested query to one of the tables in your existing statement. But which exactly, I'm not able to tell from the information provided so far.
Please comment, if and as this requires adjustment / further detail. In particular feel free to extend the Fiddle with structure and sample data for the other tables involved in order to set the full picture straight.
Good morning all, apologies for the title... i had trouble simplifying the problem down to a line. My database platform is Teradata.
I am working w/ a table like the following (let's call it "t1")
+------------+----------------------------------------+
| Service_Id | Product |
+------------+----------------------------------------+
| 1 | Traffic |
| 1 | Weather |
| 1 | Travel |
| 1 | Audio |
| 1 | Audio Add-on |
| 2 | Traffic |
| 2 | Weather |
| 2 | Travel |
+------------+----------------------------------------+
I am trying to select service_id's that are related to the following products AND ONLY the following products: Traffic, Weather, Travel
"Service_Id = 1" does not apply here because while it has the required products, it also has an "audio" product related to it... so we have to leave it out. I was able to successfully do this through a series of temp (volatile) tables but it's feeling really hacky and I feel there's got to be a better way. Thanks for your assistance.
I'm doing stuff like that (find a subset/superset/exact match for a set of rows) in my training classes using pizzas :-)
There are several ways to get your result, but for an exact match the easiest way is a SUM using following logic:
SELECT service_id
FROM t1
GROUP BY 1
HAVING
SUM(CASE WHEN Product IN ('Traffic', 'Weather', 'Travel') THEN 1 ELSE -1 END = 3
Assuming that Product is unique for every service_ID.
SELECT service_ID
FROM tableName a
WHERE Product IN ('Traffic', 'Weather', 'Travel') AND
EXISTS
(
SELECT 1
FROM tableName b
WHERE a.Service_ID = b.Service_ID
GROUP BY b.Service_ID
HAVING COUNT(*) = 3 -- <<== total number of products
)
GROUP BY service_ID
HAVING COUNT(*) = 3 -- <<== total number of products
SQLFiddle Demo (demo is running under MySQL database, not sure if it will work on teradata)