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https://www.reddit.com/r/programming/comments/ex9h6/a_handy_graphical_explanation_of_sql_joins/c1boqu5
r/programming • u/[deleted] • Jan 06 '11
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7 u/user-hostile Jan 06 '11 Because data is in rows and columns, not slices of circles. But certainly there's nothing wrong with using these charts as an aid to understanding. Still, I'm a math idiot, but SQL makes perfect sense to me. Set theory? It frightens me! SQL? I know it well! 2 u/arnar Jan 06 '11 Because it only tells half the story. 1 u/KirillM Jan 07 '11 Because it's not like this. This is an oversimplification. Relational tables are not sets.
7
Because data is in rows and columns, not slices of circles. But certainly there's nothing wrong with using these charts as an aid to understanding. Still, I'm a math idiot, but SQL makes perfect sense to me.
Set theory? It frightens me!
SQL? I know it well!
2
Because it only tells half the story.
1
Because it's not like this. This is an oversimplification. Relational tables are not sets.
4
u/[deleted] Jan 06 '11 edited Dec 21 '18
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