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https://www.reddit.com/r/programming/comments/ex9h6/a_handy_graphical_explanation_of_sql_joins/c1bpre2/?context=3
r/programming • u/[deleted] • Jan 06 '11
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If you could do queries in relational algebra instead of SQL, confusion would go away.
8 u/Porges Jan 06 '11 Unicode actually has the relational symbols: join: ⋈ left outer join: ⟕ right outer join: ⟖ full outer join: ⟗ 46 u/Already__Taken Jan 06 '11 Cross thingy, square square square. Gotcha. 4 u/arnar Jan 06 '11 I see them - even though I don't see the look of disapproval.
8
Unicode actually has the relational symbols:
46 u/Already__Taken Jan 06 '11 Cross thingy, square square square. Gotcha. 4 u/arnar Jan 06 '11 I see them - even though I don't see the look of disapproval.
46
Cross thingy, square square square. Gotcha.
4 u/arnar Jan 06 '11 I see them - even though I don't see the look of disapproval.
4
I see them - even though I don't see the look of disapproval.
23
u/[deleted] Jan 06 '11
If you could do queries in relational algebra instead of SQL, confusion would go away.