Introduction to Teradata Data Types Further Data Type considerations require occasional attention to additional issues. Happenstance Nullability Strive for nullability settings that adhere to the data model and are consistent throughout all tables. Allowing mandatory columns to be left open for null entries incurs costs for both storage and optimization. An additional presence bit per …
Multivalue compression and null indication serve distinct purposes yet share a common objective of gathering data on the values of each row’s columns. To conserve space, Teradata utilizes presence bytes to retain information on multivalue compression and nullability. The alert reader might recognize that the name “presence byte” indicates NULL values. In earlier releases of …
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