Purpose
Provides a method for including a blank line or self-contained comment within an SQL request, such as a multistatement request, macro, stored procedure, and so on.
Syntax
Syntax Elements
- pad_character
- Valid pad character, such as a SPACE character.
- SQL_comment
- Valid SQL comment string.
ANSI Compliance
Null statements, although closely related to the ANSI SQL concept of separators, are a Teradata extension to the ANSI SQL:2011 standard.
Required Privileges
None.
Invocation
Nonexecutable.
Definition: Null Statement
A statement that has no content except for optional pad characters or SQL comments.
Example: Null Statement
The semicolon in the following request is a null statement.
/* This example shows a comment followed by a semicolon used as a null statement */ ; UPDATE Pay_Test SET ...
Example: Null Statement and Statement Separator
The first SEMICOLON in the following request is a null statement. The second SEMICOLON is taken as statement separator.
/* This example shows a semicolon used as a null statement and as a statement separator */ ; UPDATE Payroll_Test SET Name = 'Wedgewood A' WHERE Name = 'Wedgewood A' ; SELECT ... -- This example shows the use of an ANSI component -- used as a null statement and statement separator ;
Example: Single Null Statement
A SEMICOLON that precedes the first or only statement of a request is taken as a null statement.
; DROP TABLE temp_payroll;