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Tutor profile: Ragini G.

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Ragini G.
Performance Engineer at Cognizant, India for 18 months; M.S @ University of West Florida;
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Questions

Subject: SQL Programming

TutorMe
Question:

$$How to retrieve details about the tutor name might be "Gummadi" from the TUTORME table ? $$

Inactive
Ragini G.
Answer:

Select * from TUTORME where tutor_name like '%Gummadi%'; Like - will help to search words that are similar to your given condition. Now, If I don't use '%' then I will not receive accurate details. For example, there are two people with Gummadi names such as Gummadi_S and S_Gummadi. If my condition was "tutor_name like 'Gummadi' " - it gives me Gummadi_S so I gave "tutor_name like '%Gummadi%' "to retrieve all the rows for that condition.

Subject: Java Programming

TutorMe
Question:

$$ How to swap two values using just two variables?$$

Inactive
Ragini G.
Answer:

$$ Usually, one would think of using temporary variable for swapping two variable. $$ $$ But I will show how we can swap by using just two variables to swap two values. $$ $$int a =10, b = 50; a = a + b; // was a - 10 and b - 50 -> now a - 60 & b - 50 b = a - b; // was a - 60 & b - 50 - > now a - 60 & b - 10 a = a - b; // was a - 60 & b - 10 -> now a - 50 & b - 10 $$ There are other possibilities as well. ping me to know.

Subject: Databases

TutorMe
Question:

$$ When is it advisable to denormalize the data? $$

Inactive
Ragini G.
Answer:

$$When you need better performance of your database, you can do it. Else, it is advisable to not denormalize. For example, Let us take the transactional environment, in which, you should not provide all the details of the transaction, few columns or sensitive data needs to be locked up that time you need to put them in other tables to maintain integrity though the performance might affect. $$

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