Aggregate operators sql, PL-SQL Programming

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Aggregate Operators SQL

Supports all of the aggregate operators mentioned in the theory book and many more besides. The syntax, however, involves an unusual trick that SQL calls a scalar subquery. A scalar subquery is a table expression that satisfies all of the following conditions:

  1. It is enclosed in parentheses.
  2. It appears where a scalar expression is expected.
  3. The result of the enclosed table expression has exactly one column and at most one row.

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