Controls whether empty strings are returned as NULL or a string containing one blank character for TDS connections.
Option can be set at the database (PUBLIC) or user level. When set at the database level, the value becomes the default for any new user, but has no impact on existing users. When set at the user level, overrides the PUBLIC value for that user only. No system privilege is required to set option for self. System privilege is required to set at database level or at user level for any user other than self.
Requires the SET ANY PUBLIC OPTION system privilege to set this option. Can be set temporary for an individual connection or for the PUBLIC role. Takes effect immediately.
TDS_EMPTY_STRING_IS_NULL is set to OFF by default and empty strings are returned as a string containing one blank character for TDS connections. When this option is set to ON, empty strings are returned as NULL strings for TDS connections. Non-TDS connections distinguish empty strings from NULL strings.