Introduction to SQL
NULL is

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

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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:

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

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