Answer / anish

for the 1st question:
v can create table by the COMMAND
CREATE TABLE table-name
column1 char(9)
.
.
...so on
And according to your installation u have to mention the
tablespace name & DB name.

for the 2nd question:
ALTER TABLE table-name
MODIFY USER_ID CHAR(12);

Answer / shailendra

i think, the size of variable is not possible to change,
please correct me if i am wrong.

so for the solutionwe can creat new table with change of
the size of user_id char(12)


and if you want the same name of table
step1 >creat a table for interface perpose with user_id char
(12)

2> insert all the data in the interface table
3> delete the main table.
4> create table with same name of main table with
user_id char(12)
5> insert data from interface table to main table.


now i think it will work.

Answer / guest

It is always possible to increase the size of the variable.
It is not possible to decrese the size.

Answer / ram prajapati

in any other database it is possible to alter the size of
the table's column but it is not possible do it in db2.
no modify command is there in db2 to be used in the
respective sql.
i'm a bit too sure about it so plz correct me when i'm wrong
with a reference link.plz.

Answer / ratheesh nellikal

Hi Ram Prajapati ,

In db2 (esp in version 9.5) it is poosible to increase the
size of a column without loosing the data.
But u can not decrease the size.

Cheers ,
Ratheesh Nellikkal

Answer / hi

Yes, it's possible to increase/decrease the size. While
decreasing, need to make sure that none of the records
present in the column conflict the modification. e.g. to
reduce the size of the column which is CHAR(6) to CHAR(4),
with one of the record value as 'ABCDE' will give an error.

explain about index with examples

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