Answer / sharad kumar

1. Function must return a value like any other Programing
Language.
2.yes we can call function from a DML.Remember count(*),sum
etc...

Answer / ankush

Function always return a value. procedure may or may be not.
IN a select statement function may be called but we should
execute the procedure.

We can call a stored function from dml statement.

Here is simple example


CREATE OR REPLACE FUNCTION TEST_1 RETURN NUMBER IS

BEGIN

RETURN(10);

END;


SELECT TEST_1 FROM DUAL;


update emp

set sal = sal+ sal*test_1();


To be called from an sql statement a function should follow
the following purity rules.
1) When called from a SELECT statement , the function
should not modify database objects.
2) When called from INSERT , UPDATE, DELETE statements ,
the function can not query or modify the tables that was
modified by the statement.
3)When called from SELECT , DELETE, UPDATE, INSERT
Statements , a function should not contain TCL, DDL
commands.

Can unique keys be null?

0 Answers  

---

How to add, remove, modify users using sql?

0 Answers  

---

Explain aggregate functions are available there in sql?

0 Answers  

---

Can we declare a column having number data type and its scale is larger than pricesionex: column_name number(10,100),column_name numbaer(10,-84)

0 Answers  

---

i have a customer table. trans_id trans_date trans_amt debit_credit_indicator 001 01-JAN-13 1099 cr 001 12-JAN-13 500 db 002 24-FEB-13 400 db 002 23-MAR-13 345 cr 001 18-APR-13 800 cr 002 15-MAR-13 600 db 001 12-FEB-13 200 cr i want like this output. trans_id trans_amt debit_credit_indicator i want get highest credit amount and lowest credit amount and highest debit amount and lowest debit amount for each trans_id. pls give me answer. i want urgent

3 Answers  

---

What plvcmt and plvrb does in pl/sql?

0 Answers  

---

How can we optimize a sql query?

0 Answers  

---

How many primary keys can a table have?

0 Answers  

---

What is partition in sql query?

0 Answers  

---

What is the difference between functions, procedures, and packages in pl/sql?

0 Answers  

---

What is form and report?

0 Answers  

---

what is the Default Libraries for Oracle Report 6i

0 Answers   IBM,

---