Use an indicator variable if the returned data might be null.
The indicator_var parameter is optional, but use an indicator variable if the possibility exists that the value of output_var is NULL.
If you specify the indicator variable without the INDICATOR keyword, you cannot put a blank space between output_var and indicator_var.
For information about rules for placing a prefix before the indicator_var, see the IBM Informix ESQL/C Programmer's Manual.
The host variable cannot be a DATETIME or INTERVAL data type.
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