Skip to main content

Using PATINDEX Function when Creating the Table

Normally Varchar , Nvarchar , Char these data types in sql server it allows character data and numeric data also ,but in some cases we don't want allow numeric data in some columns at this time we use patindex function with check constraint at time creating table or altering column in sql server.

Step-1: Creating Student table with patindex function.
CREATE TABLE Student
(
Id INT IDENTITY(1,1) PRIMARY KEY,
StudentName VARCHAR(100) NOT NULL ,
LivingLocation VARCHAR(100) NULL,constraint chk_studentname
Check (PATINDEX('%[0-9]%', StudentName)=0)
)
GO;


Step-2: Insert Some Sample Data.

INSERT INTO Student
SELECT 'Raki','Hyderabad'
GO;

The above query executed successfully.


INSERT INTO Student
SELECT 'Raki123','Hyderabad'
GO;

The above query not executed successfully,because numeric data existed in StudentName 'Raki123'.

Msg 547, Level 16, State 0, Line 1
The INSERT statement conflicted with the CHECK constraint "chk_studentname". The conflict occurred in database "blog", table "dbo.Student", column 'StudentName'.
The statement has been terminated.

Labels:

Comments

Post a Comment

Popular posts from this blog

SP_MSForeachtable

Some times we need to query on the all the tables in one data base single statement. We use SP_MSForeachtable this is known as undocumented stored procedures . These all are system stored procedures. These stored procedures is place in Master database. NOTE: Please do not run all these queries in Production environment Example: create database UnDocumentedStoredProcedure use UnDocumentedStoredProcedure create table Emp ( ID int identity ( 1 , 1 ), Name varchar ( 50 ), Salary int ) insert into Emp ( Name , Salary ) values ( 'rakesh' , 8000 ),( 'raju' , 9000 ) create table Dept ( ID int identity ( 1 , 1 ), DeptName varchar ( 100 ) ) insert into Dept ( DeptName ) values ( 'CSE' ),( 'IT' ) We are created new database and also created some table with some dummy data. Select all tables data: exec sp_MSForeachtable 'select * from ?...
1 comment
Read more

SET ROWCOUNT

Stop the processing after the number of rows has been affected. Example: Step-1: Create the Table and insert some sample data. CREATE TABLE STUDENT ( ID INT IDENTITY ( 1 , 1 ) PRIMARY KEY , STUDENTNAME VARCHAR ( 100 ) NOT NULL , LIVINGLOCATION VARCHAR ( 100 ) NULL ) INSERT INTO STUDENT ( STUDENTNAME , LIVINGLOCATION ) SELECT 'Rakesh' , 'Hyderabad' UNION ALL SELECT 'Raju' , 'Delhi' UNION ALL SELECT 'Madhu' , 'Hyderabad' UNION ALL SELECT 'Naresh' ,NULL UNION ALL SELECT 'Venaktesh' , 'Chennai' In above Insert Statement we inserted 5 sample records. Step-2: Using SET ROWCOUT SET ROWCOUNT 3 ; SELECT * FROM STUDENT ORDER BY ID DESC It will affected 3 rows after that processing has been stopped. Step-2: Using SET ROWCOUT 0 SET ROWCOUNT 0 ; SELECT * FROM STUDENT ORDER BY ID DESC ...
7 comments
Read more