如何检查sql中Where In子句中存在的所有数组元素

Question

I am facing one problem for creating one sql query. Actually i want to check if wherein clause Exists all elements or not, If all elements exists in WhereIn clause then i want to return that records with groupby.. Here is my one table produt_categories :-

id product_id  category_id
 1    1              1
 2    1              2

Sow when i apply Wherein Like below:-

SELECT * FROM `product_categories` 
WHERE  category_id in (1,2,3) group by(product_id);

Now it return me this result:-

id product_id  category_id
 1    1              1

Actually its returning me fine because actual behavior of whereIn clause. So i want if all category_id 1,2,3 exists then it must show records. If i pass 1,2 then i will also come. Hope you guys understand.Please help me to create qyuery

Answer 1

You could use HAVING :

SELECT * 
FROM `product_categories` 
WHERE  category_id in (1,2,3) 
group by(product_id)
HAVING COUNT(DISTINCT category_id) = 3;  -- #elements from `IN` clause

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SELECT * FROM tab GROUP BY col is an anti-pattern.

Related article: Group by clause in mySQL and postgreSQL, why the error in postgreSQL?