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1.	Indexes may be created or dropped at any time.
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The keyword BETWEEN can be used in a WHERE clause to refer to a range of values.
SELECT DISTINCT is used if a user wishes to see duplicate columns in a query.
The result of every SQL query is a table.
ORDER BY can be combined with the SELECT statements.
SUM, AVG, MIN, and MAX can only be used with numeric columns.
If you are going to use a combination of three or more AND and OR conditions, it is often easier to use the NOT and NOT IN operators.
Indexes may be created or dropped at any time.
SQL provides five built-in functions: COUNT, SUM, AVG, MAX, MIN.
The SQL keyword GROUP BY instructs the DBMS to group together those rows that have the same value in a column.
There is an equivalent join expression that can be substituted for all subquery expressions.

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