Skip to main content

How to add two or more columns using alter query in single line

CREATE TABLE Student
(
Id INT ,
Name VARCHAR(100)
)
GO

ALTER TABLE Student ADD Standard INT
GO

ALTER TABLE Student ADD Marks int
GO

Instead of writing 2 alter query's in above we done using single alter query.

ALTER TABLE STUDENT ADD Standard INT ,Marks INT
GO

SELECT * FROM Student
GO

DROP TABLE Student
GO


Comments

Popular posts from this blog

Coalesce function

Coalesce function returns the first non-null value among the arguments. Syntax: Coalesce (expression [,..n]) Here is example using Coalesce function Example 1 DECLARE @Str1 varchar ( 10 ), @str2 varchar ( 20 ), @Str3 varchar ( 20 ) SET @Str2 = 'Sql' , @Str3 = 'Server' SELECT COALESCE ( @Str1 , @str2 , @Str3 ) As [Coalesce] In above example @Str2 value is ‘Sql’ , @str3 value is ‘Server’  and @str1 values is Null because it not assigned any value . Output: It return’s “Sql” because Coalesce function return’s first non null value. Example 2: Coalesce in select statement. IF OBJECT_ID ( 'Employee' , 'U' ) IS NOT NULL DROP TABLE Employee CREATE TABLE Employee (   ID INT IDENTITY ( 1 , 1 ) PRIMARY KEY ,   NAME VARCHAR ( 20 ),   SALARY INT ) INSERT INTO Employee   ( NAME , SALARY ) VALUES ( 'Rakesh' , 5000 ),(NULL, 6000 ),( 'Naresh...

IDENTITY COLUMNS

Identity column specifies when ever new value is inserted into table. Identity column automatically inserted value into column. Identity Column can be specified at the time of creation of table. CREATE TABLE Employee (  EMPID INT IDENTITY ( 1 , 1 ),  EMPNAME VARCHAR ( 50 ),  SALARY INT ) In above table creation script EMPID column specifies IDENTITY property i.e., whenever a new row inserted into a Employee table EMPID Column will automatically value is inserted. INSERT INTO Employee ( EMPNAME , SALARY ) VALUES ( 'RAKESH' , 7000 ) INSERT INTO Employee ( EMPNAME , SALARY ) VALUES ( 'ALI' , 12000 ) SELECT * FROM Employee When u run above select statement is the following result is if u are trying insert value into identify columns .it will give error. INSERT INTO Employee ( EMPID , EMPNAME , SALARY ) VALUES ( 1 , 'RAKESH' , 7000 ) Msg 5...

CONCAT FUNCTION IN SQL SERVER 2012

Concat function is used concatnating the values among the different arguments. Syntax: Concat([String1],[String2]..[StringN]);  DECLARE @FName VARCHAR ( 50 ), @LName VARCHAR ( 50 ); SET @FName = 'Rakesh' ; SET @LName = 'Kalluri' ; SELECT CONCAT ( @FName , ' ' , @LName ) as [FullName] ; Output: Rakesh Kalluri --Before SQL 2012 Versions we can use like this way DECLARE @FName VARCHAR ( 50 ), @LName VARCHAR ( 50 ); SET @FName = 'Rakesh' ; SET @LName = 'Kalluri' ; SELECT @FName + ' ' + @LName as [FullName] ; Output: Rakesh Kalluri --But Before SQL 2012 Versions there are 2 problems when we  contacting . --1.Need to replace NULL Value to Empty.if we directly concat NULL Value the  Entire  result also NULL. --Before 2012: DECLARE @FName VARCHAR ( 50 ), @LName VARCHAR ( 50 ); SET @FName = 'Rakesh' ; SELECT @FName + ' ' + @LName a...