mysql - Searching for groups of rows where a column contains ALL given values -


i have table symptom_ratings containing columns id, user_id, review_id, symptom_id, rate, , strain_id.

each review can have multiple entries in symptom_ratings, 1 per symptom.

i search every strain_id has of symptom_id's user searches for.

that is, given columns:

review: 2, strain_id: 3, symptom_id: 43   review: 2, strain_id: 3, symptom_id: 23   review: 2, strain_id: 3, symptom_id: 12  review: 6, strain_id: 1, symptom_id: 3   review: 6, strain_id: 2, symptom_id: 12

searching symptom_id's 43 , 12 should return results strain_id 3.

i use following where condition: 

strain.id in (select strain_id     symptom_ratings     symptom_id     in ($symptoms))

where $symptoms comma-separated list of symptom_id values.

my problems query performs or search (i.e. finds strains have any of symptoms), instead i'd prefer , search (i.e. finding strains have all of symptoms). how can achieve that?

one way group rows strain id, count number of distinct matching symptoms in each group, , return rows count equals total number of symptoms searched for:

select     strain_id,     count(distinct symptom_id) matched_symptoms symptom_ratings symptom_id in (43, 12) group strain_id having matched_symptoms = 2

here's quick online demo.

one potentially useful feature of method it's trivial extend support both "all of these", "any of these" , "at least n of these" searches changing condition in having clause. latter cases, can sort results number of matching symptoms (e.g. order matched_symptoms desc).


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