add btree and crossed-out NULL visuals

agentm · Jul 16, 2024 · 428116e · 428116e
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diff --git a/TutDForSQLDevelopers/NULL-X.png b/TutDForSQLDevelopers/NULL-X.png
diff --git a/TutDForSQLDevelopers/NULL-X.xcf b/TutDForSQLDevelopers/NULL-X.xcf
diff --git a/TutDForSQLDevelopers/b-tree.jpg b/TutDForSQLDevelopers/b-tree.jpg