Consider the following DBDL description of an entity: Teachers (teach_num: variable length character string length 10 NO

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answerhappygod
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Consider the following DBDL description of an entity: Teachers (teach_num: variable length character string length 10 NO

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Consider the following DBDL description of an entity: Teachers (teach_num: variable length character string length 10 NOT NULL teach_name: variable length character string length 10 NOT NULL) Primary Key: teach_num which integrity constraint is satisfied?

A. Entity integrity
B. Necessary data
C. Referential integrity
D. Referential foreign integrity
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