Join With Sub query Joining Specific ID

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What I'm trying to achieve is to bring the top 1 CLM000ID of each instance where the CLMSTSID is equal 3. I'm assuming with the below it will join the top 1 regardless of the CLM00ID. How can I achieve this?

Table is something like this

CLM000ID    |     CLMSTSID
1                  2
1                  3
2                  3



LEFT JOIN UC00LCNTRY0 cntry ON drs.CNTRY0ID=cntry.CNTRY0ID
LEFT JOIN (SELECT TOP 1 CLM000ID,LSTPDTS 
            FROM UC07DCLSTTR 
            WHERE CLMSTSID=3
            ORDER BY LSTPDTS DESC) dtclsd ON dtclsd.CLM000ID=c.CLM000ID
LEFT JOIN UC10DSR0000 clmf ON clmf.SR0000ID=c.CLMSFCRID

If you are trying to do this in a subquery, then you want OUTER APPLY:

LEFT JOIN
UC00LCNTRY0 cntry
ON drs.CNTRY0ID = cntry.CNTRY0ID OUTER APPLY
(SELECT TOP 1 CLM000ID,LSTPDTS 
 FROM UC07DCLSTTR dc
 WHERE dc.CLM000ID = c.CLM000ID AND
       dc.CLMSTSID = 3
 ORDER BY LSTPDTS DESC
) dtclsd 

SQL joins and how to use them, When our data was all in a single table, we could easily retrieve a particular row from that table in In the query below, the line INNER JOIN (addresses) ON ( users.id One example would be joining our users , checkouts , and books tables. Here i want to Display Male Records from EmployeeDetail Using Subquery(bu joining Gender colun to the Employeedetail) i got that by using joins by writing the query as Select Firstname,Lastname,Salary,Gender from Employeedetail join tblGender on Employeedetail.GenderId = tblGender.Id Where Gender = ' Male' but how to do it using a subquery.

use max() aggregation function instead of getting the top record.

LEFT JOIN UC00LCNTRY0 cntry ON drs.CNTRY0ID=cntry.CNTRY0ID
LEFT JOIN (SELECT MAX(CLM000ID) CLM000ID, LSTPDTS 
            FROM UC07DCLSTTR 
            WHERE CLMSTSID=3 AND CLM000ID=c.CLM000ID
            GROUP BY LSTPDTS) dtclsd ON dtclsd.CLM000ID = c.CLM000ID
LEFT JOIN UC10DSR0000 clmf ON clmf.SR0000ID=c.CLMSFCRID

4 Ways to Join Only The First Row in SQL, The subquery will run once for each row in the outer query: select * from users join ( select * from widgets where id in ( select max(id) from� A subquery can be used with JOIN operation. In the example below, the subquery actually returns a temporary table which is handled by database server in memory. The temporary table from the subquery is given an alias so that we can refer to it in the outer select statement.

I believe I found a way to accomplish this but using ROW_NUMBER() OVER

SELECT CLM000ID, CLMSTSID, LSTPDTS, ROW_NUMBER() OVER (partition by CLM000ID ORDER BY LSTPDTS DESC)
            FROM UC07DCLSTTR 
            WHERE CLMSTSID=3 
            and CLM000ID in (18)--(2,5,6,10,12,13,15,16,17,20,21,22,24,25,26,27,29,18)          
            ORDER BY LSTPDTS DESC

The Power of Subqueries, A subquery SELECT statement if executed independently of the T-SQL The virtual Table is referenced in the outer query by the alias A and is joined with person_id. We used a subquery in the FROM clause of the UPDATE statement to identity the This inner query will calculate the average "Quantity" for the particular� A subquery is also called an inner query or inner select, while the statement containing a subquery is also called an outer query or outer select. Many Transact-SQL statements that include subqueries can be alternatively formulated as joins. Other questions can be posed only with subqueries.

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Comments
  • Each instance of what? More sample data, desired results, explanation and an appropriate database tag would all help. Your code mentions three tables (at least) and you haven't explained them.
  • Thanks Gordon. Could you explain what Outer APPLY does?
  • @Camus . . . Technically, it implements a lateral join. More practically, it acts like a correlated subquery that can return multiple columns, multiple rows, and is in the FROM clause.
  • Sorry but I wasn't very clear. If the top of the CLM000ID is 2 for instance then I don't want to join. Pretty much 3 indicates a specific status (closed). This table works as a tracking table. So it can change from 3 to 2 and vice versa. Grabbing the Max won't indicate that the current status is closed