How can you find out which query is taking lot of time to execute in cobol-db2 program ?

1 Answers   Danske,

---

I use CS and update a page. Will the lock be released after I am done with that page?

2 Answers  

---

Explain about rct.

0 Answers  

---

what are the SQL codes u freequently got?

2 Answers   Logica CMG,

---

What is the difference between primary key & unique index ?

6 Answers   Patni, Temenos,

---

---

How do you define a correlated name?

1 Answers  

---

What is meant by union and union all?

0 Answers  

---

Compare a subselect to a join?

1 Answers  

---

What is coalesce in db2?

0 Answers  

---

SET is the ANSI standard for variable assignment, SELECT is not. SET can only assign one variable at a time, SELECT can make multiple assignments at once. If assigning from a query, SET can only assign a scalar value. If the query returns multiple values/rows then SET will raise an error. SELECT will assign one of the values to the variable and hide the fact that multiple values were returned (so you'd likely never know why something was going wrong elsewhere - have fun troubleshooting that one) When assigning from a query if there is no value returned then SET will assign NULL, where SELECT will not make the assignment at all (so the variable will not be changed from it's previous value) As far as speed differences - there are no direct differences between SET and SELECT. However SELECT's ability to make multiple assignments in one shot does give it a slight speed advantage over SET.

0 Answers  

---

How to find the number of rows in a db2 table?

0 Answers  

---

What is a SELECT statement?

1 Answers  

---