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SQL Where COUNT > 0

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Sep 03.2020

I have this code, works well.

I want it to only show records where TTL is greater than 0.

If I add “AND TTL > 0 ” in the WHERE clause, it errors. Help please.

“`
SELECT p.ID, p.ProductName, p.Image, COUNT(*) as `TTL`

FROM `products` p
JOIN `inventory` i ON p.ID = i.ProductID

WHERE i.DateAdded > 0 AND p.ProductStatus = 0 AND p.ID != 60

GROUP By p.ID
“`

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PHP

2 Comments(s) ↴

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@NogDogSep 03.2020 — Yeah, TTL doesn't get calculated until after the WHERE is applied, so doesn't really exist at that point. However, how would COUNT(*) ever be 0? Seems to me it would always be at least 1. If you were doing a SUM() or AVG() on some field, then that would make sense, but just counting rows.... 🤷‍♂️
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@sibertSep 04.2020 — Normally you can move the count and use "HAVING" instead of "WHERE". I do not know if it works in MySQL as I have not any data to test with.

``<i>
</i>SELECT p.ID, p.ProductName, p.Image
FROM products p
JOIN inventory i ON p.ID = i.ProductID
HAVING count(*)&gt;0
GROUP By p.ID<i>
</i>``
https://www.mysqltutorial.org/mysql-having.aspx/
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