Answer / yvbchowdary

yes u can delete the default constraint. First find out the
constraint name for the default and then execute the
following quey

alter table <table-name> drop constraint <constraint-name>

Answer / pooja khanna

As i understand this question is not about removing the
constraint in a column. It is about removing the columns
containing default constraint.
If it is about removing the default constraint then given
answer no. 1 is absolutely correct.It's quite a bit similar.
However, if you want to remove column containing default
constraint,first you need to drop the default constraint
then you can remove the column/'s :-

First remove the constraint :
eg :- as answer 1.
step 1:- alter table <table-name> drop constraint
<constraint-name>

step 2: alter table <table-name>
drop column <column-name>

Answer / krishnakumar

table create time must constraint name is important..create
time not use constraint name don't delete don't delete
constraint column

alter table table_name drop constraint <constraint name>
table create time use this query
create table delete_table(emp_id int constraint del_pk
primary key,age int)

constraint name delere query
.............................

alter table delete_table drop constraint del_pk

Answer / suraj

-- CONSTRAINTS are used to limit the type of data that
can go in to a table.
-- You can have multiple CONSTRAINTS in any one column
of a table.
-- You don't have to drop CONSTRAINTS in order to be
able to drop the table.

Answer / vikas

Default is constraint and to drop any constraint in sql server
syntax is same

Alter Table TableName Drop Constraint ConstraintName

visit :

http://www.tutorialsqlserver.com/Create/Default-Value-in-Sql-Server.htm

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