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Example :; transfers transfer_amount from x's account to y's account ; Supposes x&y both accounts exist TRANSACTION (x, y, transfer_amount) Start transaction IF X AND Y
#question.what is mapping constraints and types?.
anyone have a textbook solutions case fair, 8 edition of vol 1 ?, please give me
Describe Database state in details? Database state: The actual data within the database at a particular moment in time is known as a database state.
Consider the relation PERSON. If you want to display details of persons having age less than or equal to 30 than the select operation will be used as follows: σ AGE The resu
Define reference file
Removing a Synonym: DROP SYNONYM D30;
define lock conversion
In case of entity integrity, the primary key may be declared? In a case of entity integrity primary key may be not Null.
E-R model uses this symbol to represent weak entity set ? A Doubly outlined rectangle symbol is used to represent weak entity set.
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