ASA SQL Reference
  SQL Functions
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HOUR function [Date and time]

Function 

Returns a number from 0 to 23 corresponding to the hour component of a datetime.

Syntax 

HOUR ( datetime-expression )

Parameters 

datetime-expression    The datetime.

Standards and compatibility 

• SQL/92    Vendor extension.

• SQL/99    Vendor extension.

• Sybase    Not supported by Adaptive Server Enterprise.

Example 

The following statement returns the value 21:

SELECT HOUR( '1998-07-09 21:12:13' )