Added diagram showing INNER and LEFT JOIN

[adamancer]

Partially addresses #314. I found these diagrams useful when learning SQL and think this would be a good addition.

[github-actions]

Thank you!

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Rendered Changes

🔍 Inspect the changes: https://github.com/datacarpentry/sql-ecology-lesson/compare/md-outputs..md-outputs-PR-362

The following changes were observed in the rendered markdown documents:

 03-sql-joins.md         |   9 ++++++++-
 fig/sql-joins.png (new) | Bin 0 -> 66554 bytes
 md5sum.txt              |   2 +-
 3 files changed, 9 insertions(+), 2 deletions(-)

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⏱️ Updated at 2023-06-23 18:02:00 +0000