Answer / srinu

U r correct Chandan.But one thing,what is that is if the
table contains some data at that time syntax for adding new
column to that table with notnull constraint is....

alter table table_name add column_name datatype default
value constraint constraint_name not null;

if we want 2 know which columns have which constraints then
the syntax is

select column_name,constraint_type
from user_cons_columns
where table_name='EMP';

Answer / chandan kumar

If table is empty (means no records are there) then we can
add the constraint.

alter table tablename add (col_name datatype not null)

What is trigger price?

0 Answers  

---

Which data type is a composite type?

0 Answers  

---

what is the Default Libraries for Oracle Report 6i

0 Answers   IBM,

---

What is t sql used for?

0 Answers  

---

what is indexing, searching and user interface?

1 Answers   HCL,

---

Write a sql query to convert all character to uppercase after hypen.

0 Answers  

---

How many sql are there?

0 Answers  

---

What is clustered and nonclustered index in sql?

0 Answers  

---

explain advantages of innodb over myisam. : Sql dba

0 Answers  

---

What is integrity in sql?

0 Answers  

---

what is the syntax used for partition in tsql? : Transact sql

0 Answers  

---

Which kind of parameters cannot have a default value in pl sql?

0 Answers  

---