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Ive got two tables here. I want to match all the teddies in this table with all the bricks on this one, based on their color. I need a join. When writing a select statement you put the tables in the from clause. You can place as many tables as you want here, But if thats all you do youve got a problem; A cross join. This returns every row in each table combined with every row in every other table. This is also known as the Cartesian product. Its exceptionally rare you want to do this. In cases where you do its better to explicitly state this with the cross join syntax. This helps future developers know that, yes a Cartesian product is really what you intended. Note: there are two separate join styles; Oracle and Ansi. With Oracle syntax all of the join conditions go in the where clause. Ansi has a separate join clause. The where clause is reserved for non-join filters. Which is better is the subject of fierce debate. Personally I prefer Ansi. This makes it clear what your join c