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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 table, statement is to create table N_emp as select empname, empid from employee
Nested Queries Let us see some more complex queries in this section. Sub-queries: Some of the basic concerns of sub-queries are: A sub-query is a SELECT statemen
Hi I have got an assignment for making an er diagram for market management software can any budy help me?
Define the term Domain. For each n every attribute there is a set of permitted values known as the domain of that attribute.
With the help of an example display how records can be deleted and updated in QBE. (i) Increase Pay_Rate of employees along with the skill of ‘cook' by 10%. (ii) Delete employee
Explain the components of Database System in details.
What is difference between TRUNCATE and DELETE? - Truncate can't be rolled back whereas Delete can be. - Truncate keeps the lock on table whereas Delete keeps the lock on ea
what is completeness constrent?
Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient. Figure:
what is er digram given that example of hospital,bank and library er digram.
Define Direct file organization? The direct file organization is employed to enhance the performance in accessing the records than sequential file organization. In direct file
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