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To delete a particular column in a relation which command is used ?
To delete a particular column in a relation ALTER command is used.
Describe substring comparison in SQL. For the relation Person (name, address), write a SQL query that retrieves the names of people whose name starts along with ‘A' and address co
What is bucket overflow and how bucket overflow is handled through Over Flow Chaining or Closed Hashing? Ans: Bucket: unit of storage holding records. Bucket is a disk block
Logical Operators Rules of Precedence: Order evaluated Operator 1 All comparison operators 2
What is object containment? References among objects can be used to model dissimilar real-world concepts.
Explain the utilities which help the DBA to manage the database? Every DBA uses database utilities to maintain and control their databases. But there is a lot of confusion wit
What are the three classes of SQL expression? SQL expression consists of three clauses: Select From Where
What is Identity? Identity (or AutoNumber) is a column that automatically produces numeric values. A start and increment value can be set, but most DBA leave these at 1. A GUID
Benefits and limitations
non numeric literals
Problem: A DBMS built for Online Transaction Processing (OLTP) is usually regarded as unsuitable for data warehousing. Each system is designed with a different set of requireme
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