15.10 - Indicator Variables and Input - Preprocessor2 for Embedded SQL

Teradata Preprocessor2 for Embedded SQL Programmer Guide

prodname
Preprocessor2 for Embedded SQL
vrm_release
15.10
category
Programming Reference
featnum
B035-2446-035K

Use indicator variables when the application requires the Teradata Database to set a column value to null, such as when executing an INSERT or UPDATE statement.

Indicator variables can be used within a WHERE clause with host variables to indicate a null.

A negative value indicates the value in the associated main variable is to be ignored and PP2 is to send a null to the Teradata Database for the column.

A zero or positive value specifies the host variable value is to be sent to the Teradata Database as the column value.

EXEC SQL
      INSERT table1 VALUES (:hostvar1 :indvar1)
END-EXEC
EXEC SQL
      UPDATE   table1
      SET   col1 = :hostvar1 :indvar1
      WHERE col1 = :hostvar2
END-EXEC