Deleting table coloumn from two tables in mysql?

PHP
1

DELETE
.cat_id,app_questions.id,app_questions.question,app_questions.cat_id,app_questions.a,a
pp_questions.b,app_questions.c,app_questions.answer,app_questions.explanation FROM
app_categories INNER JOIN app_questions ON app_categories.cat_id=app_questions.cat_id WHERE
app_categories.cat_id =7

#1109 - Unknown table ‘cat_id’ in MULTI DELETE

following delete query not working but same query with SELECT working fine

2

Is there something missing in front of the period here?

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