Query to select a row from a table from another using id

Question

I have two tables A and B. A has columns a,b,c,d,e,f and B has columns a and g. How can I get the row from table A according to the value of 'a' from Table B?

Answer 1

Try simple join query

Select A.a From A inner join B on A.a=B.a

if need extra condition

Select A.a From A inner join B on A.a=B.a where B.a=?

Answer 2

Try this:

SELECT a.a, a.b, a.c, a.d, a.e, a.f, b.g
FROM A a,
INNER JOIN B b ON a.a = b.a
WHERE a.a = b.a

These are the basics of SQL, next time try to read up on the basics first. You can go here W3SCOOLS if you want to learn.