SQL SELECT TOP, LIMIT and ROWNUM Keywords
SELECT TOP, LIMIT and ROWNUM
The LIMIT, SELECT TOP 
or ROWNUM command is used to specify the number of records to return.
Note: SQL Server uses 
SELECT TOP. MySQL 
uses LIMIT, and Oracle uses 
ROWNUM.
The following SQL statement selects the first three records from the "Customers" table (SQL SERVER):
The following SQL statement shows the equivalent example using the LIMIT clause (MySQL):
The following SQL statement shows the equivalent example using ROWNUM (Oracle):
Example
SELECT * FROM Customers
WHERE ROWNUM  <= 3;
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