UNION or UNION ALL

I've 3 tables A,B,C <br />records in table A like: <br /><u>id          name</u><br />b1        abc <br />b2       
xyz<br />b3        rst <p>records in table B like: <br /><u>id        type</u><br />b1        logistics <br />b1       
importer<br />b2        logistics <br />b3        logistics <br />b3        exporter <p>records in table C like: <br
/><u>id       offer        title</u><br />b1        sell        car <br />b1        buy        car <br />b1       
sell       van <br />b2        sell        car <p>How shoul I do a query so that I can get a result like <br />(The
querywill be based on B.type ='logistics') <br /><u>id        name       offer</u><br />b1        abc        sell <br
/>b1       abc        buy <br />b1        abc        sell <br />b2        xyz        sell <br />b3       
rst           -- <p>Any help very much appricated