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What’s the difference between Inner, Left, Right and Full join?

The diagram below illustrates how different types of joins work.

(INNER) JOIN: returns only matching rows between both tables.

LEFT (OUTER) JOIN: returns all matching rows, and non-matching rows from the left table.

RIGHT (OUTER) JOIN: returns all the matching rows, and non-matching rows from the right table.

FULL (OUTER) JOIN: returns all the rows from both left and right tables, including non-matching rows.
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Amazing visual explanation: pass by reference Vs pass by value

Think of the coffee in the cup as the #data in a variable. One is a copy and the other one is the original.

gif credit: penjee

https://media.licdn.com/dms/image/C4D22AQHrjx3qDNn_Cg/feedshare-shrink_800/0/1672665015273?e=1676505600&v=beta&t=PyVnoRhAbmSgbhX2YDSwDx3N_dh5icvwSsVQz25iyCE
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