I want to join three tables with this query:
select *, max(working_dx.date_added), diagnosis_list.diagnosis as WorkingDiagnosis from working_dx
inner join ild on ild.id_incr=working_dx.pt_id
inner join diagnosis_list on working_dx.dx_id = diagnosis_list.id
group by pt_id";
I want all the records in ild table, even if no matching record in working_dx - if no match the value in WorkingDiagnosis would simply be blank.
The above query only gives me back records where working_dx.dx_id has a value. How do I do the JOIN statements to give me back all the records even if blank.
try this:
SELECT *, max(working_dx.date_added),
(CASE WHEN diagnosis_list.id IS NULL THEN "" ELSE diagnosis_list.diagnosis END) as WorkingDiagnosis
FROM working_dx
INNER JOIN ild on ild.id_incr=working_dx.pt_id
LEFT JOIN diagnosis_list on working_dx.dx_id = diagnosis_list.id
GROUP BY pt_id;
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