I have two tables - subjects
and questions
.
Structure and rows of table subjects
are like :-
----------------------------
subject_id | subject_name
----------------------------
1 | physics
2 | chemistry
3 | biology
Structure and rows of table questions
are like :-
question_id | subject_id | subject_name | question
---------------------------------------------------------
1 | 0 | physics | demo_question_1
2 | 0 | physics | demo_question_2
3 | 0 | chemistry | demo_question_3
4 | 0 | biology | demo_question_4
I added column subject_id
in questions
table after I had already inserted some rows. I want to bulk update subject_id
of questions
table as per subjects
table. I can update them individually, using WHERE
, but I was hoping if any single query would do this work?
Not sure what you mean by a single query versus a WHERE
, but I think this will suit your needs.
UPDATE questions q, subjects s
SET q.subject_id = s.subject_id
WHERE q.subject_name = s.subject_name;
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