db2：十进制列到varchar列

Question

My db2 version is 9.5:

I have a select query as below:

select sum(BAL_BOOK_AMT) as sum from mySchema.myTable group by idCol

This results as below:

  SUM
---------
 0
 2,475,000
 746,966.091
-627,247.63

I want to use this query as below:

insert into mySchema.myTable1 select sum(bal_book_amt) as sum from mySchema.myTable group by idCol

However, the SUM column in mySchema.myTable1 is of type VARCHAR(40) (which I can not change to decimal because of other reasons). Because of which I am getting below error:

 by: com.ibm.db2.jcc.b.nm: DB2 SQL Error: SQLCODE=-408, SQLSTATE=42821

When I try the following:

select char(sum(BAL_BOOK_AMT)) as sum from mySchema.myTable group by idCol

the values becomes:

00000000000000000000000000000.00 
00000000000000000000000000000.00 
00000000000000000000002475000.00 
00000000000000000000000550000.00 
00000000000000000000000746966.09 

which I do not want.

How can I format such that the values comes as String as is:

 0
 2,475,000
 746,966.091
-627,247.63

Thanks for reading!

Answer 1

Try to use VARCHAR_FORMAT() function

insert into mySchema.myTable1 
select VARCHAR_FORMAT(sum(bal_book_amt), '999,999,999,999.99') as sum
....