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  4. 9(107)'2012
  5. The condition of conservation valid state database when modifying the structure relations

The condition of conservation valid state database when modifying the structure relations

S.S. Tanyanskiy
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An approach to the construction of an equivalent database in the modification of its structure. The conditions of correct database states when implementing queries. The properties of the compatibility versions of the database. To support the structural characteristics to date introduced the function output data objects for the different states database.
Keywords: database, display database information object, the state of the database, integrity constraints, the logical rule, the operating specification