mysql in list only validates first id in list. maybe a blob issue [duplicate]

Answer 1

Yes, it's astring issue. Your 'list' is just a string to mysql, meaning nothing.

You would have to use RegEx.

But you might think about normalizing your tables instead.

Answer 2

What's happening is that MySQL is converting the blob to an integer (not a list of integers) for comparison. So '24,25,26' becomes the value 24. You can confirm this by running the query

SELECT CAST(categories AS signed) FROM mytable

This is not how IN (nor the blob data type) is meant to be used. Is there a reason you're not using another table for this?

Answer 3

I think you are looking for FIND_IN_SET

 SELECT * FROM mytable WHERE FIND_IN_SET(25,category)

Answer 4

This should give you your asnwer:

SELECT * FROM mytable WHERE CONCAT(',', categories, ',') LIKE '%,25,%'

But it would make more sense to create a connecting table, with each comma separated value as a new row.