Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / asnani_satish@yahoo.com
Difference between sub-query, correlated query and query as
table
1. Sub-query : the inner query is executed in entirety
before the outer query is executed
eg select * from emp where deptno in (select deptno from dept);
2. Correlated Query: For each record fetched in outer query
corresponding matching records are fetched in sub-query
because of join condition within inner sub-query. Answers
1,2,3 are correct
3. Query as Table: A query can behave as a table
select a.empno,a.sal,a.sal/b.avgsal*100 as percent_avg_sal
from emp a,(select deptno,sum(sal) avgsal from emp group by
deptno) b
where a.deptno=b.deptno;
Here the entire "(select deptno,avg(sal).....)" behaves as
table named "b". The query is behaving as a temporary table.
| Is This Answer Correct ? | 16 Yes | 3 No |
Post New Answer View All Answers
how to fetch common records from two tables? : Sql dba
how many ways to get the current time? : Sql dba
What is sql integrity?
How to Execute a Package in PL/SQL.?
What is a primary key called that is made up of more than one field?
What is the max nvarchar size?
Is primary key clustered index?
What is sql character function?
What is column?
how to concatenate two character strings? : Sql dba
What do we need to check in database testing?
What is raid? How does it help storage of databases?
what is cross join? : Sql dba
C. Normalize the following data up to the 3rd Normal form. Create the tables and insert the data given. Emp_ID Name Dept_Name Salary Course_Title Date_Completed 100 Adam Marketing 48,000 SPSS 6/19/2008 Surveys 10/7/2008 140 Bob Accounting 52,000 Tax Acc 12/8/2008 110 Cathy IT SQL Server 1/12/2008 C# 4/22/2008 190 Dan Finance 150 Emily Marketing 55,000 SPSS 6/16/2008 42,000 Analysis 8/12/2008 Queries 1. Find all Names who have completed the SPSS Course. 2. Find employee with max salary. 3. Find employee with 2nd max salary. 4. Find all employees in Dept “Marketing”. 5. Find all the employees who have taken more than 2 courses. 6. Find all the employees who have completed the courses before month of September.
Explain architecture of sql server notification services?
