Comment by roganp

Exactly. It's always inner joins unless there is a reason not, and then there should be logic to deal with the null results from the outer table. It's not strange to always do left outer either, it just makes reasoning about the query easier (start with the driving set, the inner/outer join the others as left joins). Mixing right and left outer always confuses me, and full outer joins are difficult to optimize, so I usually do left outer joins with unions in the rare case that I need a full outer join.