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How to create a table from existing table? Create table as e.g, To create a new table ‘N_emp' with employee names and their identification numbers only from employee ta
What are the properties of transaction? There are three properties of transactions :- A) Atomicity B) Consistency C) Isolation
Give detail description on Transactions. - Using transactions we can group all SQL commands into a single unit. - Transaction begins with some task and finishes only when a
What is recovery management component? Ensuring durability is the responsibility of a software component of the base system known as the recovery management component.
For Colorado customers calculate the number of single products ordered. If a product is purchased on multiple orders, it should be counted only single time. The result should conta
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What is the meaning of Data Independence ?
Consider the two relations given below Given that A is the primary key of R, D is the primary key of S and there is a referential integrity among S.A and R.A, discuss all
What is nested relational model? The nested relational model is an extension of relational model in which domains might be either atomic or relation valued.
External failure : A failure can also result because of an external cause, such as earthquakes, fire, floods, etc. The database must be duly backed up to avoid troubles occurring d
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