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What is the difference between structure and table in SAP data dictionary?

Differences between database tables and structures in SAP, Do structures have Primary Keys in SAP?

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Table and structure have lots of differences in the sense of behavior and properties, the below are the main differences between tables and structure in the data dictionary.

Table and Structure Difference

Table Structure
Tables will store data physically and permanently. Structure can not store data physically, it can hold data at run time only.
Tables have primary key's. Structure's does not have any primary key.
Table have technical settings (data class, size category, etc), maintenance attributes (Display maintenance restrictions). Structure's does not have any technical attributes and maintenance attributes.
Table have primary and secondary indexes. Structures does not have primary and secondary indexes.

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