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How do these queries execute?
There are three SQL statements (a, b & c) below, each of which performs a left join. Can anyone please explain how the execution of these statements differs from the other? a) select c.c_name, a.n_name from retail.client c left join retail.area a on c.c_nationkey = a.n_nationkey and a.n_name is null;
sql left join on and