Introduction to SQL
The wildcard in a WHERE clause is useful when?

An exact match is necessary in a CREATE statement.
An exact match is not possible in a CREATE statement.
An exact match is not possible in a SELECT statement.
An exact match is necessary in a SELECT statement.

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Introduction to SQL
To define what columns should be displayed in an SQL SELECT statement:

use FROM to name the source table(s) and list the columns to be shown after SELECT.
use USING to name the source table(s) and list the columns to be shown after WHER
use SELECT to name the source table(s) and list the columns to be shown after USING.
use USING to name the source table(s) and list the columns to be shown after SELECT.

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Introduction to SQL
NULL is

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

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