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Editorial Team
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Asked: 2026-05-12T16:38:00+00:00

I have the following sql query : SELECT DATE(procedures.start) date, name, COUNT(procedure_types.id) count FROM

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I have the following sql query :

SELECT DATE(procedures.start) date, name, COUNT(procedure_types.id) count
FROM `procedure_types`
  LEFT OUTER JOIN procedures on procedure_types.id = procedures.procedure_type_id
WHERE (DATE(procedures.start) = '2009-10-24')
GROUP BY DATE(procedures.start), procedure_types.id
ORDER BY DATE(procedures.start), procedure_types.id

There are two tables procedures & procedure_types.
Procedure has procedure_type_id which points to the procedure_types table.

The query is executing fine, but I want to list the procedure_types with count(0) even if they aren’t being referenced by any procedures on that date.

I know it’s something to do with the joins..can someone please help ?

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1 Answer

  1. Editorial Team

    Your WHERE clause is excluding procedure_types with no procedures. You need to move it to the JOIN:

    SELECT DATE(procedures.start) date, name, COUNT(procedure_types.id) count
FROM `procedure_types`
LEFT OUTER JOIN procedures on procedure_types.id = procedures.procedure_type_id
    AND DATE(procedures.start) = '2009-10-24'
GROUP BY DATE(procedures.start), procedure_types.id
ORDER BY DATE(procedures.start), procedure_types.id
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