What are the all different types of Joins in SQL Server 2000, Anybod

Different Types Of JOINS: Most of the joins you will come across are based on equality, with the equijoin being the most dominant. In this chapter you learned about equijoins; there are other types of joins you must become familiar wi

what is the difference between primary key & foreign key?

Primary keys enforce entity integrity by uniquely identifying entity instances. Foreign keys enforce referential integrity by completing an association between two entities.

What is the difference between join and union.

we can join two tables by 'join' if they have common field.we can union two tables irrespective of common field.

How do we get month name in SQL Server 2000, Oracle, MS Access?

select datename(mm,getdate())

Write a query to get 2nd maximum salary in an employee table ?

select empno,ename,sal from (select ename,empno,sal,dense_rank() over(order by sal desc)topn from emp) where topn=2

What is the difference between SQL, DDL, and DML?

Structured Query Language (SQL) is a language that provides an interface to relational database systems. In common usage SQL also encompasses DML (Data Manipulation Language), for INSERTs, UPDATEs, DELETEs and DDL (Data Definition Language),

what is primary key,unique key, foreign key? can u teach me in simple

Primary key - Primary key means main key def:- A primary key is one which uniquely identifies a row of a table. this key does not allow null values and also does not allow duplicate values. for ex, empno empname salary 1 f

What are the differences between stored procedure and functions in SQ

The Text property exposes the Transact-SQL or other script that defines the referenced Microsoft? SQL Server? 2000 database object. The FunctionName property specifies the function name to call in the Microsoft? ActiveX? script associated wi

How do we get current date in SQL Server 2000, Oracle, MS Access?

SELECT GETDATE() AS 'Current Date' GO

write the query for find the top 2 highest salary in sql server

select Distinct Top 2 Salary from EMP order by Salary desc

Write a query to delete duplicate records in SQL SERVER

DELETE FROM A WHERE (id NOT IN (SELECT MAX(ID) FROM A GROUP BY name)) suppose i have table called A. A has two coloumn id (identity) as int and

what is the difference between TRUNCATE and DELETE command in SQL

Truncate command cannot be rolled back while Delete can be

how to find the second highest salary from emp table?

Please put the below query, u will get the second highest salary of the table :--- select sal from(select sal from (select distinct sal from emp order by sal desc) where rownum<=2 order by sal asc) where rownum=1

Define candidate key, alternate key, composite key.

A candidate key is one that can identify each row of a table uniquely. Generally a candidate key becomes the primary key of the table. If the table has more than one candidate key, one of them will become the primary key, and the rest are cal

how to find nth highest salary

DECLARE @SQL VARCHAR(2000), @N INT SET @N = 5 SET @N = @N - 1 SET @sql = 'select top 1 salary from ABC where salary not in ( SELECT TOP ' + CAST(@n AS VARCHAR(100)) + ' salary FROM ABC ) ' SELECT @SQL EXEC (@SQL)

Top Databases Interview Questions :: ALLInterview.com