Answer / babji009

A view is a virtual table made up of data from base
tables and other views, but not stored separately.
Ex:
CREATE VIEW GOOD1_SUPPLIERS
AS SELECT S#, STATUS, CITY
FROM S
WHERE STATUS > 15;
SELECT * FROM GOOD1_SUPPLIERS;

---------+---------+---------+---------+-----------
SELECT * FROM GOOD1_SUPPLIERS;
---------+---------+---------+---------+-----------
S# STATUS CITY
---------+---------+---------+---------+---
S3 40 PARIS
S4 110 LONDON
S8 30 ATHENS
S7 20 U.S.A

Answer / om yadav

after a table is created and populated with data, it may
become necessary to prevent all users from accessing all
column of a table, for data security reasons.
To reduce redundant data to the minimum possible, allows the
creation of an object called VIEW.
Define:= A VIEW is mapped , to a select sentence. The SELECT
clause consists of a sub-set of the columnb of the table.
thus a view , which is mapped to a table, will in effect
have a sub-set of the actual column of the table from which
it is bulit.

This technique offers a simple, effective way of hiding
column of the table.

What do you mean by NOT NULL? When will you use it?

3 Answers  

---

How can you validate Sql errors during cursor operation in db2 pgms and where do you code?

0 Answers   IBM,

---

What is the function of the Data Manager?

2 Answers  

---

when we are tying to update a table having 100 rows. if the program abends when updating 51 row . how to start updating again from the 51 row .what was the logic

2 Answers   TCS,

---

Explain various types of locks in db2?

0 Answers  

---

How do you Load a table ?? and what is Load replace ?

2 Answers   Xansa,

---

What db2 400?

0 Answers  

---

Can any one tell me about Restart logic in DB2.

2 Answers  

---

i hav created a program and moved to production but failed to create the table which is been used in the program. the program shows error as soon as it is moved or installed in production or shows error during its runtime. what is the sqlcode for this error

3 Answers   UST,

---

Could you please let me no the query for below I have table name xyx under this there is column name called employee name which starts from 100th column ends 120th column,now i want to replace only column from 101 to 104 which contains ABCS to replace with PQRS for all records which comes beetween 101 to 104 ..how to write query for this..

1 Answers   HSBC,

---

What will the FREE command do to a plan?

2 Answers  

---

What is phantom read in db2?

0 Answers  

---