T-SQL：从一个表中选择外键，然后在另一个表中找到对应的行

Question

I have two tables: tblA contains a foreign key which I want to use to pull corresponding rows from tblB. The following queries will not work, but they explain what I want to do:

SELECT [MyID]
FROM [tblA]

SELECT [MyColumn]
FROM [tblB]
WHERE [ID] = [tblA].[MyID]

This should be a fairly simple query but I am a noob with T-SQL.

Answer 1

Use a JOIN :

SELECT A.MyID, B.MyColumn
FROM tblA A INNER JOIN tblB B
    ON A.MyID= B.ID

There are different types of joins , the INNER JOIN returns only rows from tblA with a matching key in tblB .