Answer / lu

yes, read this :
Updating a column: You can update columns in the rows that
you retrieve. Updating a row after you use a cursor to
retrieve it is called a positioned update. If you intend to
perform any positioned updates on the identified table,
include the FOR UPDATE clause. The FOR UPDATE clause has
two forms:
• The first form is FOR UPDATE OF column-list. Use
this form when you know in advance which columns you need
to update.
• The second form is FOR UPDATE, with no column list.
Use this form when you might use the cursor to update any
of the columns of the table.
For example, you can use this cursor to update only the
SALARY column of the employee table:

EXEC SQL
DECLARE C1 CURSOR FOR
SELECT EMPNO, FIRSTNME, MIDINIT, LASTNAME, SALARY
FROM DSN8810.EMP X
WHERE EXISTS
(SELECT *
FROM DSN8810.PROJ Y
WHERE X.EMPNO=Y.RESPEMP
AND Y.PROJNO=:GOODPROJ)
FOR UPDATE OF SALARY;

If you might use the cursor to update any column of the
employee table, define the cursor like this:

EXEC SQL
DECLARE C1 CURSOR FOR
SELECT EMPNO, FIRSTNME, MIDINIT, LASTNAME, SALARY
FROM DSN8810.EMP X
WHERE EXISTS
(SELECT *
FROM DSN8810.PROJ Y
WHERE X.EMPNO=Y.RESPEMP
AND Y.PROJNO=:GOODPROJ)
FOR UPDATE;

DB2 must do more processing when you use the FOR UPDATE
clause without a column list than when you use the FOR
UPDATE clause with a column list. Therefore, if you intend
to update only a few columns of a table, your program can
run more efficiently if you include a column list.
The precompiler options NOFOR and STDSQL affect the use of
the FOR UPDATE clause in static SQL statements. If you do
not specify the FOR UPDATE clause in a DECLARE CURSOR
statement, and you do not specify the STDSQL(YES) option or
the NOFOR precompiler options, you receive an error if you
execute a positioned UPDATE statement.

Is there any advantage to denormalizing DB2 tables?

1 Answers  

---

What keyword does an SQL SELECT statement use for a string search?

2 Answers  

---

How would one remove old reorg information from the DB2 catalog?

2 Answers  

---

Hi Everyone... Under the Logical files, when am working on multiple rec format logical file, I have joined two pf's using the multiple record format logical file concept, but when i run queried the LF only the first mentioned pf records are reflecting and I am not able to see any of the field records specified under the second pf. Kindly let me know whats the reason behind this. Below is the str of LF., R rec PFILE(LOGICAA) CUSTNO CUSTNAME BILL K CUSTNO R rec1 PFILE(LOGICAA1) CUSTNO ADD K CUSTNO .....

0 Answers  

---

I have 3 cursors declared. Cursor1 retieves some data. Based on this curso2 will also fetches some data. In cursor3 (using for some updation) I'm using the data retrieved by the above 2 cursor. My question is, while working with cursor3, periodically if I give commit, will all the three crsors will be closed or only cursor3 will be closed?

4 Answers  

---

Which is faster delete or truncate?

0 Answers  

---

What is the syntax for seeing the columns and data types of a table in the db2 database?

0 Answers  

---

how will i display the duplicate record's from a table... i don't want to eliminate ...i want to display the duplicate record...for example in my table i have 10 record's like record no(1,2,3,4,2,9,6,1) in this ...so i want to receive duplicates...

1 Answers   UST,

---

What does db2 plan contain?

0 Answers  

---

Hi Dude,this is Ram.could any one tell me aboue CURRENT OF clause in DB2. Thanks in advance.......

2 Answers  

---

PLAN IS EXECUTABLE AND PACKAGE IS NOT EXECUTABLE . THEN WHAT IS THE USE OF PACKAGE?

2 Answers   Tech Mahindra, Wipro,

---

pls explain the precompilation process of cobol-db2 pgm

3 Answers   HCL, IBM,

---