http://www.allinterview.com Top Databases Interview Questions en-us http://www.allinterview.com/showanswers/36608.html 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 http://www.allinterview.com/showanswers/15625.html 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 http://www.allinterview.com/showanswers/28427.html select datename(mm,getdate()) http://www.allinterview.com/showanswers/11457.html A composite Key can be either Primay or Unique Key More then One Key columns are said to be composite keys Candidate Key(Primary Key) is a Key which Maintains the Row Uniue .Can be defined based on the Entity Alternate Key or Unique Key is http://www.allinterview.com/showanswers/56803.html In DBMS Normalization process wille not be present and in RDBMS normalization process will be present to check the database table cosistency Muralidhran dharanmu@yahoo.com http://www.allinterview.com/showanswers/35345.html Primary keys enforce entity integrity by uniquely identifying entity instances. Foreign keys enforce referential integrity by completing an association between two entities. http://www.allinterview.com/showanswers/60479.html UNIQUE and DISTINCT http://www.allinterview.com/showanswers/23527.html 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 http://www.allinterview.com/showanswers/13863.html we can join two tables by 'join' if they have common field.we can union two tables irrespective of common field. http://www.allinterview.com/showanswers/61202.html 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 http://www.allinterview.com/showanswers/28430.html SELECT GETDATE() AS 'Current Date' GO http://www.allinterview.com/showanswers/20536.html The column holding the primary key constraint cannot accept null values.whereas colum holding the unique constraint can accept null values assume that t3 is a table with two columns t1 having primary key constraint and t2 having unique constr http://www.allinterview.com/showanswers/20600.html select empno,ename,sal from (select ename,empno,sal,dense_rank() over(order by sal desc)topn from emp) where topn=2 http://www.allinterview.com/showanswers/404.html 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), http://www.allinterview.com/showanswers/19459.html 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)