SQL Assignment08 - Delete Statement

1. Delete from customers.
2. Delete depositor of branches having number of customers between 1 and 3.
3. Delete branches havinng average deposit less than 5000.
4. Delete branches having maximum loan more than 5000.
5. Delete branches having deposit from Nagpur.

SQL Assignment07 - Update Statement

1. Give 10% interest to all depositors.
2. give 10% interest to all depositors having branch VRCE
3. Give 10% interest to all depositors living in city Nagpur.
4. Give 10% interest to all depositors having branch in city BOMBAY and living in Nagpur.
5. Add 100 Rs to deposit of Anil and assign it to Sunil.
6. Change the deposit of VRCE branch to 1000 and change the branch as VRCE_UPT
7. Assign to the deposit of Anil the maximum deposit from VRCE branch

Oracle SQL Tuning Tips - 1

Consideration when writing an SQL statement is that it returns a correct result. The second is that it be the most efficient for a given situation.  You can use many different SQL statements to achieve the same result. It is often the case that only one statement will be the most efficient choice in a given situation.

Remember that processing SQL is a sequence of Parse (syntax check and object resolution), Execution (required reads and writes), and Fetch (row results retrieved, listed, sorted, and returned). SQL “tuning” consists, quite simply, of reducing one or more of them.

Note: generally Parse is the greatest time and resource hog. Parse overhead can be minimized by the use of Procedures, Functions, Packages, Views, etc.