Introduction to SQL
NULL is

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

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Introduction to SQL
In an SQL SELECT statement querying a single table, according to the SQL-92 standard the asterisk (*) means that:

None of these
all records with even partial criteria met are to be returned.
all columns of the table are to be returned.
all records meeting the full criteria are to be returned.

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