Answer / venkat

The format of this keyword is:
UNIQUE[(*INCNULL | *EXCNULL)]The parameter is optional. When specified, it determines whether null key values cause duplicates. *INCNULL is the default and indicates to include null values when determining duplicates. *EXCNULL, when specified, indicates to exclude null values when determining duplicates.
When a logical file based on a physical file has the UNIQUE keyword, the physical file member or members cannot have duplicate key values.

When you specify the UNIQUE keyword for a physical or logical file, you must specify the MAINT(*IMMED) parameter value on the Create Physical File (CRTPF) or Create Logical File (CRTLF) command that creates the file. This means that the access path is maintained immediately when changes are made.

If you do not specify the UNIQUE keyword, records with duplicate key values are sequenced in the order you specify. If you specify the FIFO keyword, they are sequenced in first-in first-out order. If you specify the LIFO keyword, they are sequenced in last-in first-out order. If you specify the FCFO keyword, they are sequenced in first-changed first-out order. If you do not specify FIFO, LIFO or FCFO, the order in which the records are sequenced is not guaranteed.

You cannot specify the UNIQUE keyword with the FIFO, LIFO, FCFO, or REFACCPTH keywords.

Example
The following example shows how to specify the UNIQUE keyword for a logical file.

|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
00010A*
00020A* SAMPLE LOGICAL FILE (CUSMSTL)
00030A*
00040A UNIQUE
00050A R CUSREC PFILE(CUSMSTP)
00060A TEXT('Logical File Master Record')
00070A CUST
00080A NAME
00090A ADDR
00100A K CUST

Answer / ravi kumar

Hi,

Yes. When Pf doesn't contain duplicate records based on key value then we can use UNIQUE keyword in logical file. If pf contain Duplicate values then LF will not compile.


I have tried in this scenario

Answer / sravan

Yes you can use unique key in logical files.

How to find d key field of a pf that doesn’t have source physical file?

2 Answers  

---

1.Coding in cl to send an message? 2..What is turnover and use? What are the different levels?

4 Answers   IBM,

---

we are sending data of physical file to screen design and it is showing no record why?

1 Answers   NTT Data,

---

How to read a record from file where there is multiple record occurrence is available?

1 Answers  

---

thanks mr.Harshad R Suryawaunshi,i'm new to as400 i think you are telling in rpgile i know only rpg400 if possible can you tell in rpg400

0 Answers   iGate,

---

In RPG program one file using as a PRIMARY file while running program some of the records reading twice any body know why its happening

2 Answers  

---

steps involved in debugging and types of debugging modes?

1 Answers  

---

1. If there are two programs using same file and 2 users are using the file at the same time and what can be done to allow them both to access? 2. How can remove lock from the file for accessing it by both users?

0 Answers  

---

in which journalling which attributes are necessary??/

1 Answers   CTS,

---

How to print output from openquery in as400 ?

1 Answers   Four soft,

---

What is the difference Return and InLr?

3 Answers  

---

what is EXCEPT command in rpg and use

1 Answers   Active Brains,

---