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  

---

What do you need to do before you do EXPLAIN?

1 Answers  

---

What is the logical entity between plan and Package?

5 Answers  

---

What is the syntax for FETCH in DB2 ?

0 Answers   MCN Solutions,

---

What error I will get if my select query gives multiple row while executing a Cobol-DB2 program.How can I solve it without using a cursor.

4 Answers   Cap Gemini, Verizon,

---

Why do we use cursor?

0 Answers  

---

What is bind in db2?

0 Answers  

---

What is database alias db2?

0 Answers  

---

What are the isolation levels possible ?

3 Answers  

---

What is difference between isnull and coalesce?

0 Answers  

---

What is consistency token in db2?

0 Answers  

---

Is it mandatory to use DCLGEN? If not, why would you use it at all?

2 Answers  

---