Hello!
I'm new to SQL and i've searched everywhere for the answer to this question but I can't seem to find the anwer anywhere. My question is.....
If there are multiple rows for a specific filed, is there a way in SQL to only return the last row based on that specific field.
For example, I wrote a query that returns a list of patients who have a specific lab type. If a patient has had several labs taken, they show up in the result set several times (for each lab date). I only want to return the most recent lab date.
Here is my query........
SELECT id, resulted_test_d esc, result_value, units, update_date
FROM dbo.lab_result LEFT OUTER JOIN
dbo.mpi ON dbo.lab_result. blind_key = dbo.mpi.chart LEFT OUTER JOIN
dbo.mpi_xref ON dbo.mpi.chart = dbo.mpi_xref.bl ind_key
WHERE resulted_test_d esc = 'Hemoglobin'
Any help would be greatly appreciated.
Thanks!
Amedeo
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Recognized Expert Specialist
Hello!
I'm new to SQL and i've searched everywhere for the answer to this question but I can't seem to find the anwer anywhere. My question is.....
If there are multiple rows for a specific filed, is there a way in SQL to only return the last row based on that specific field.
For example, I wrote a query that returns a list of patients who have a specific lab type. If a patient has had several labs taken, they show up in the result set several times (for each lab date). I only want to return the most recent lab date.
Here is my query........
SELECT id, resulted_test_d esc, result_value, units, update_date
FROM dbo.lab_result LEFT OUTER JOIN
dbo.mpi ON dbo.lab_result. blind_key = dbo.mpi.chart LEFT OUTER JOIN
dbo.mpi_xref ON dbo.mpi.chart = dbo.mpi_xref.bl ind_key
WHERE resulted_test_d esc = 'Hemoglobin'
Any help would be greatly appreciated.
Thanks!
Amedeo
sort it in descending order based on your criteria then try this query:
select top 1 from....
order by [criteria] desc
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