Mysql query IN clause return results - php

Question

Good Day! All Fridays,
I have some problem in my sql query. I'm using IN class with subquery like this
SELECT
cm.category_id,
cd.name
FROM
category_master cm,
category_detail cd,
brand_to_categories b2c
WHERE
cm.category_id = b2c.category_id
AND
cd.category_id = cm.category_id
AND
cd.language_id = 1
AND
cm.status <> 2
AND
cm.category_id IN (SELECT DISTINCT sub_dd.categories FROM distribution_master bdm, distribution_detail bdd, subscription_category_to_brand_user sub_dd WHERE bdd.distribution_id = bdm.distribution_id AND bdm.distributor_id = 35 AND bdd.brand_id = 7191 AND sub_dd.sub_d_id = bdd.id)
AND
b2c.brand_id = 7191;
The following is the sub-query which is creating problem for me.
cm.category_id IN (
SELECT DISTINCT
sub_dd.categories
FROM
distribution_master bdm,
distribution_detail bdd,
subscription_category_to_brand_user sub_dd
WHERE
bdd.distribution_id = bdm.distribution_id
AND
bdm.distributor_id = 35
AND
bdd.brand_id = 7191
AND
sub_dd.sub_d_id = bdd.id)
the result of the sub-query is like this.
3913,4517,6059,7137,7138,7139,7140,7141,7144
this result is coming from only single row in the target table because I stored these ids as string in the filed.
Now the problem is this, I can not get results of the all categories. Main query final result only return one category information which category_id is 3913. But if I run this query manually with sub-query values instead of the sub-query then it returns all the categories results.
Manual query with sub-query values is like this
SELECT
cm.category_id,
cd.name
FROM
category_master cm,
category_detail cd,
brand_to_categories b2c
WHERE
cm.category_id = b2c.category_id
AND
cd.category_id = cm.category_id
AND
cd.language_id = 1
AND
cm.status <> 2
AND
cm.category_id IN (3913,4517,6059,7137,7138,7139,7140,7141,7144)
AND
b2c.brand_id = 7191;
Please help me regarding this problem.
Sorry I forget, I'm using Mysql

Answer 1

Assuming you are using MySQL, use FIND_IN_SET:
WHERE
...
FIND_IN_SET(cm.category_id,
(SELECT DISTINCT sub_dd.categories
FROM distribution_master bdm,
distribution_detail bdd,
subscription_category_to_brand_user sub_dd
WHERE bdd.distribution_id = bdm.distribution_id AND
bdm.distributor_id = 35 AND
bdd.brand_id = 7191 AND
sub_dd.sub_d_id = bdd.id)) > 0
If you are using SQL Server, then we have to do a bit more work:
WHERE ',' + (SELECT DISTINCT ...) + ',' LIKE '%,' + cm.category_id + ',%'
General comment: Avoid storing CSV data in your SQL tables. MySQL almost made the problem worse by offering FIND_IN_SET and making it easier to skirt good table design.