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WHERE and HAVING clause in SQL ?
The WHERE clause is commonly used for implementing conditions on each tuple of the relation. The HAVING clause is used in combination along with the GROUP BY clause. It can be used in a SELECT statement to filter groups of the records which a GROUP BY returns. The syntax for the HAVING clause is: SELECT column1, column2, ... column_n, aggregate_function (expression)FROM tablesWHERE predicatesGROUP BY column1, column2, ... column_nHAVING condition1 ... condition_n; Aggregate_function can be a function such as SUM, COUNT, MIN, or MAX.WHERE and HAVING clause in SQL.
What is the difference between serial and sequential files? How searching is applied on both? Ans: A serial file is one where the records have been stored in the order where
What is meant by Physical blocks? The input and output operations are completed in block units. The blocks residing on the disk are referred to as physical blocks.
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What are the key features of Oracle? Key features of Oracle are as follows: • Read Consistency • Concurrency • Locking Mechanisms • Quiesce Database • RAC • Portability
Compare wait-die deadlock prevention scheme with wait-wound scheme Ans: Wait-Die Scheme a) Based upon a nonpreemptive technique. b) If Pi requests a resource present
A student entity type has the following attributes,name..
Describe the storage structure of indexed sequential files and their access method. Ans: Index offers a lookup capability to rapidly reach the vicinity of the desired record.
Define raid? Briefly explain it? A range of disk organization methods, collectively called redundant arrays of independent disks (RAID) o Improvement of reliability throug
what is attribute is attribute inheritance in dbms?
What is Index? An index is a physical structure having pointers to the data. Indices are created in an existing table to locate rows more quickly and efficiently. It is possibl
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