Comments on: SQL SERVER – 2008 – Creating Primary Key, Foreign Key and Default Constraint

By: Sharan Chakradhar

Sharan Chakradhar — Fri, 03 Feb 2012 14:07:42 +0000

How do I fetch MAC address in SQL server to implement in triggers.

By: SQL SERVER – Various Ways to Create Constraints – Quiz – Puzzle – 17 of 31 « SQL Server Journey with SQL Authority

Wed, 18 Jan 2012 01:31:44 +0000

[...] Default Constraint Over Table Column Create Primary Key with Specific Name when Creating Table Creating Primary Key, Foreign Key and Default Constraint How to ALTER CONSTRAINT Disable CHECK Constraint – Enable CHECK Constraint Query to Display [...]

By: vipin kumar

vipin kumar — Tue, 17 Jan 2012 07:40:39 +0000

window authentication mode used when you use your application with your system and sql server authentication is used when multiple application used a centrally database .

By: madhivanan

madhivanan — Thu, 15 Dec 2011 14:36:39 +0000

You can do it in INSERT and UPDATE statements

By: Avinash Patil

Avinash Patil — Mon, 12 Dec 2011 06:56:59 +0000

Hi sir,
My question is-
In sql server authentication mode which is more secure authentication? (Windows or Sql server)

By: dharmesh

dharmesh — Fri, 09 Dec 2011 04:40:33 +0000

how to insert a manual int value in primary key , sql server 2008

By: Brent

Brent — Tue, 06 Dec 2011 14:58:21 +0000

Thank you, always seem to forget the exact syntax on many of those.

By: Tha

Tha — Fri, 07 Oct 2011 03:29:14 +0000

Thanks for your post.

By: Pankaj

Pankaj — Wed, 28 Sep 2011 10:31:32 +0000

Your posts are really usefull

By: Richardm

Richardm — Thu, 15 Sep 2011 19:26:14 +0000

Greetings Pinal – Always find your answers helpful and spot on. At the moment I’m stuck in SQL/Server hell and can’t find a solution. I have a table that I can’t drop, can’t truncate, can’t do anything with because of this message “it is being used for foreign key constraint enforcement.” I have dropped ALL of the constraints on the table, and still can’t get around this error. There is a unique index that is being referenced that can’t be dropped either because of the same error response. I’m stuck in a circular hell. How do I get out of hell with this table?

By: yosepkurniawijaya

yosepkurniawijaya — Fri, 09 Sep 2011 15:37:59 +0000

Hi, greeting from Indonesia. I’ve been looking for script of creating a foreign key related to the primary key from the column level and your explanation was great. Thank you very much! God bless

By: madhivanan

madhivanan — Fri, 09 Sep 2011 10:59:09 +0000

It is a single primary key combined on many columns. You cannot create primary key on each column seperately.

By: Madhu

Madhu — Thu, 08 Sep 2011 03:55:12 +0000

Hi madhivanan,

we can create more than one primary key we can call it as composite key..

By: madhivanan

madhivanan — Wed, 07 Sep 2011 13:46:45 +0000

Note that there cannot be more than one primary key in a table

By: Madhu

Madhu — Wed, 07 Sep 2011 09:42:45 +0000

Hi Mr. Pinal,

One table having one cluster Index in the case of one primary key. If more than one primary keys are there in a table, then how many clustered Indexes are created for table?

Please reply me……

Thanks & Regards
Madhu….

By: rama chandra sahu

rama chandra sahu — Mon, 29 Aug 2011 10:08:34 +0000

Can’t we create a default constraint at table level ???

By: Dinesh

Dinesh — Fri, 26 Aug 2011 10:40:26 +0000

HAI,
I want learn SQL more.Is any way to understand SQL easely.
REGARDS
Dinesh

By: ram

ram — Fri, 05 Aug 2011 11:18:32 +0000

first you have to create one table then –.> go to stored procedure –>
and write code like a

create procedure [procedure_name]
(
declare variables
[while u declare a variable start with ' @ ' and end with ,]
example
@name nvarchar(50)

By: ram

ram — Fri, 05 Aug 2011 11:04:38 +0000

try to chage your main table unique key bcoz unique key access from the null values so try to use primary key then u il set the foreign key ur table

By: ram

ram — Fri, 05 Aug 2011 10:58:21 +0000

can anyone help me!!!
when ever i create identity primary key tat error showing all the times

“Must declare the scalar variable “@”ID”

By: manoj bhatt

manoj bhatt — Wed, 18 May 2011 19:51:08 +0000

dear sir,
i have a table called student_ id with 3 column id(pkey),name and course.

i wants to access id (start with 3 and end with 8,means 5 values)
hw can this is possible with asp.net application

By: manoj bhatt

manoj bhatt — Thu, 12 May 2011 18:21:20 +0000

i am now satisfy with ur answer

thanks

By: sravanthi

sravanthi — Sat, 09 Apr 2011 05:24:47 +0000

Hi Pinal Sir,
I hava a problem in creating foreign key in my sql table.im using sql 2008.
Can i set two foreign keys in two child tables with references to one unique key in main table .
pleas help me.

By: ramakrishna

ramakrishna — Sat, 09 Apr 2011 03:15:25 +0000

Hi Pinal
I create salespeople table
create table salespeople(snum int CONSTRAINT pk_snum PRIMARY KEY,sname varchar(50),city varchar(50),comm decimal(12))
i inserted data like this
insert into salespeople values(1002,’bama’,'bangalore’,.18)
insert into salespeople values(1003,’kama’,'Bobbili’,.15)
insert into salespeople values(1004,’anjuri’,'vizag’,.14)
———————-
then i create customer table
create table customer(cnum int INT CONSTRAINT pk_productSales_sid PRIMARY KEY,
Cname varchar(50),
city varchar(50),rating int ,
snum int CONSTRAINT fk_snum_pid FOREIGN KEY REFERENCES salespeople(snum))
inser values
insert into customer values(200,’jayanth’,'bangalore’,100,1004)
insert into customer values(2005,’bhagyasri’,'guntur’,200,1006)
—————-
i create order table
create table orders(onum int CONSTRAINT pk_productSales_sid PRIMARY KEY,
amount decimal(10),Orderdate datetime,
snum int CONSTRAINT fk_snum2_pid FOREIGN KEY REFERENCES salespeople(snum),
cnum int CONSTRAINT fk_cnum_pid FOREIGN KEY REFERENCES customer(cnum))

i got the error
Msg 2714, Level 16, State 4, Line 1
There is already an object named ‘fk_snum_pid’ in the database.
Msg 1750, Level 16, State 0, Line 1
Could not create constraint. See previous errors.

How to solve those errors
plz send details urgent pinla

By: Nidhi Dave

Nidhi Dave — Thu, 17 Mar 2011 05:22:27 +0000

Hello
Pinal

Your posts are really very helpful
thank you