Question

I would like to know if it is possible, to select certain columns from one table, and another column from a second table, which would relate to a non imported column in the first table. I have to obtain this data from access, and do not know if this is possible with Access, or SQL in general.

Answer 1

Assuming the following table structure:

CREATE TABLE tbl_1 (     pk_1 int,     field_1 varchar(25),     field_2 varchar(25) );  CREATE TABLE tbl_2 (     pk_2 int,     fk_1 int,     field_3 varchar(25),     field_4 varchar(25) ); 

You could use the following:

SELECT t1.field_1, t2.field_3 FROM tbl_1 t1 INNER JOIN tbl_2 t2 ON t1.pk_1 = t2.fk_1 WHERE t2.field_3 = 'Some String' 

In regard to Bill’s post, there are two ways to create JOIN’s within SQL queries:

• Implicit – The join is created using the WHERE clause of the query with multiple tables being specified in the FROM clause

• Explicit – The join is created using the appropriate type of JOIN clause (INNER, LEFT, RIGHT, FULL)

It is always recommended that you use the explicit JOIN syntax as implicit joins can present problems once the query becomes more complex.

For example, if you later add an explicit join to a query that already uses an implicit join with multiple tables referenced in the FROM clause, the first table referenced in the FROM clause will not be visible to the explicitly joined table.