Comments on: SQL SERVER – How to ALTER CONSTRAINT

By: mehjabeen

mehjabeen — Wed, 29 May 2013 06:22:49 +0000

how to remove constraint which i dont gave the constraint name my syntax is
CREATE TABLE emp
(
e_id NUMBER,
first_name VARCHAR2 (15),
last_name VARCHAR2 (15),
doj DATE,
salary NUMBER (10),
d_id NUMBER (3),
l_id NUMBER (3),
week_off VARCHAR2 (15) NOT NULL,
mngr_id NUMBER (3),
pan_no VARCHAR2 (10) UNIQUE,
phone_no NUMBER (20)
)
i want remove the mngr_id constraint
plz reply

By: SQL SERVER – Weekly Series – Memory Lane – #026 | SQL Server Journey with SQL Authority

Sat, 27 Apr 2013 01:31:46 +0000

[...] How to ALTER CONSTRAINT Very simple straight to the script blog post. [...]

By: yogesh

yogesh — Tue, 26 Feb 2013 12:38:16 +0000

how to apply constraint for valid email address in oracle

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

Wed, 18 Jan 2012 01:31:46 +0000

[...] 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 Foreign Key Relationships and [...]

By: Sunny

Sunny — Tue, 14 Jun 2011 18:38:27 +0000

We can prevent constraints…….

create table x
(
id int not null,
salary money not null constraint check_sale check(salary>0)
)
select * from x
insert into x values (1,-8)
alter table x nocheck constraint check_sale

By: sbn

sbn — Wed, 27 Apr 2011 14:31:52 +0000

wow, thanks imran. i am try it

By: sbn

sbn — Wed, 27 Apr 2011 14:29:54 +0000

thanks madhivanan, previously I also think the same as your :)

By: Nakul Vachhrajani

Nakul Vachhrajani — Tue, 26 Apr 2011 17:41:23 +0000

Hello!

It would be nice to understand the reason why SQL Server does not allow us to modify, i.e. alter an already established constraint.

Any plans on writing an article on the same?

By: madhivanan

madhivanan — Tue, 26 Apr 2011 14:12:01 +0000

CREATE TABLE [dbo].[TestTableCity]
(
Id int identity(1,1),
[City] AS (‘City’+CAST(Id VARCHAR(50)))
,CityName VARCHAR(50)
)

By: Imran Mohammed

Imran Mohammed — Tue, 26 Apr 2011 00:04:30 +0000

@Sbn

I don;t see a reason why you have to do concatination in table, you can always do this in view that does a select on this table.

For Ex:

CREATE TABLE [dbo].[TestTableCity]
(
ID int IDENTITY(1,1) not null
,CityName VARCHAR(50)
)

CREATE VIEW [Vw_TestTableCity]
AS
Select ‘City’+ Convert(varchar(46),ID) AS City
,CityName
From [TestTableCity]

Insert into TestTableCity values (‘Hyderabad’)

go
Select * from [Vw_TestTableCity]

But if you want to do it your own way which I don;t recommend, below is a way,

CREATE TABLE [dbo].[TestTableCity]
(
[City] AS (‘City’+ Convert(varchar(46),ID))
,CityName VARCHAR(50)
,ID int IDENTITY(1,1) not null
)
go
Insert into TestTableCity values (‘Hyderabad’)
go
Select * from TestTableCity

~ IM.

By: sbn

sbn — Sun, 24 Apr 2011 11:59:54 +0000

Hello Pinal,

I want to make a table, with expression a coloumn_id combination varchar and identity int.
example :
CREATE TABLE [dbo].[TestTableCity]
(
[City] AS (‘City’+CAST(IDENTITY(1,1)) AS VARCHAR(50)))
,CityName VARCHAR(50)
)

please check my query, help help