Introduction to SQL
A subquery in an SQL SELECT statement:

can only be used with two tables.
can always be duplicated by a join.
cannot have its results sorted using ORDER BY.
has a distinct form that cannot be duplicated by a join.

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Introduction to SQL
NULL is

the same as 0 for integer and blank for character
the same as 0 for integer
the same as blank for character
not a value

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