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Asked: 2026-05-29T21:10:35+00:00

Here is the general setup. I have the tables Cards , Attributes , and

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Here is the general setup.

I have the tables Cards, Attributes, and a join table between them. (Let’s call it Tags. It contains a CardID and an AttributeID.) The Attributes table is mostly just descriptions such as HasPower, IsPoisonous, ImmuneToWater, etc.

How would I go about querying for all cards that are both IsPoisonous and IsElectric? Let’s assume I have the IDs for those already (13 and 45), so technically, the Attributes table does not need to be part of this SQL. I concocted something like this, but I’m not even sure if it is optimal.

SELECT *, (COUNT * FROM Tags t WHERE t.CardID = c.CardID AND t.AttributeID IN (13, 45)) AS TagCount
FROM Cards c
WHERE TagCount = 2

I hope my question makes sense. Basically, imagine you are looking at a web UI; you are sifting through a pool of ~5000 cards and want to filter down your results. So, you start checking boxes: “Poisonous”, “Electric”, “Immune to Water”, etc. The results then filter down based on those attributes.

Thoughts?

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1 Answer

  1. Editorial Team
    SELECT *
FROM Cards
WHERE (Cards.Id IN (
    SELECT DISTINCT CardID
    FROM Tags
    WHERE AttributeID IN (13, 45)
    GROUP BY CardID
    HAVING (COUNT(AttributeID) >= 2)
))

    Inner query fetches the CardIDs that have at least two of the attributes you’d specified, then uses that result as a filter to fetch the actual card data in the outer query.

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