根据表A选定的列从表B中选择一列

Question

I'm trying to do the below.

Table A
Name ID

Table B
ID Remark

Select Table B Remark based on Table A Name.

Use Name to get ID in table A then match ID in table B to get Remark from Table B.

Is this possible please?

Answer 1

You can use where exists

select remark from tableB b where exists (select 1 from tableA a where a.name= [give_name] and a.id=b.id); 

or in

select remark from tableB b where b.id in (select id from tableA where name = [give_name]);

Answer 2

You can use a JOIN

SELECT remark FROM tableB b
JOIN tableA a ON a.ID = b.ID 
WHERE a.name = ?