Question: What s the difference between a single - row subquery and a multiple - row subquery? If a subquery is used in the FROM clause

Whats the difference between a single-row subquery and a multiple-row subquery?
If a subquery is used in the FROM clause of a query, how are the subquerys results referenced in other clauses of the query?
Whats the difference between correlated and uncorrelated subqueries?

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