Correct way to select from two tables in SQL Server with no common field to join on

Question

Back in the old days, I used to write select statements like this:

SELECT 
table1.columnA, table2.columnA

FROM
table1, table2

WHERE
table1.columnA = \'Some         


        

Answer 1

You can (should) use CROSS JOIN. Following query will be equivalent to yours:

SELECT 
   table1.columnA
 , table2.columnA
FROM table1 
CROSS JOIN table2
WHERE table1.columnA = 'Some value'

or you can even use INNER JOIN with some always true conditon:

FROM table1 
INNER JOIN table2 ON 1=1