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Dokumentation

ABAPWHERE_USING_KEY - WHERE USING KEY

• If a sorted key is declared, the logical expression uses comparisons linked with AND with the relational operator = (or EQ) to include an initial part of the key that consists of at least one component. An AND operation with further comparisons is possible.
  
• If a hash key is declared, the logical condition uses comparisons linked with AND with the relational operator = (or EQ) to include all components of the key. An AND operation with further comparisons is possible
  
• The logical expression selects the same rows as a READ TABLE statement, in which the relevant components are specified as keys.