What is data modeling with example?
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You are testing the performance of a query the first time you run the query, the performance is slow. the second time you run the query, the performance is fast. why is this?
Where is dbms used?
What are defaults? Is there a column to which a default can't be bound?
State the acid rules?
You have a table with three columns: amount1, amount2, and amount3 in a single row only one of these three columns will have a value and the other two will be null. Write a sql query to retrieve the values from these columns?
agregator gives one to many records or many to one record
what is the use of foreginkey
What are the three basic rules which are to be followed for the relational model of the database?
Explain about the hierarchical model of the database?
How to use online Backups?
Explain about network model?
What is denormalization and when would you go for it?
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