What is file level keyword AS400?
This keyword identifies which physical file contains the field. You can use this file-level keyword to specify that records with duplicate key values from the same physical file member are retrieved in a last-in first-out (LIFO) order.
What is key field in AS400?
When you specify K in position 17, the name specified in positions 19 through 28 is a key field name. It must be one of the field names within the physical file record format. The contents of this field are used to sequence the records for retrieval from the database. Specifying a key is optional.
What is physical file and logical file in AS400?
Physical files contain the actual data that is stored on the system, and a description of how data is to be presented to or received from a program. They contain only one record format, and one or more members. Logical files do not contain data. …
What is record format in physical AS400?
Record format for physical files As the name of a new record format with field names specified in this physical file. The name of the record format can be the same as the file name specified in the Create Physical File (CRTPF) command. The FORMAT keyword must be specified. Field names and attributes are not specified.
Why do we need logical file in AS400?
Ü Logical file It simply contains the record selection definition and when accessed retrieves the records from the physical file to which it refers. A logical file does not contain any data but provides the ‘VIEWS’ of the data to satisfy end-user’s needs.
What is flat file in AS400?
Flat files are nothing but a physical file with only one column. The length of this column is usually larger than a typical column of any other physical file. This is because each record of a flat file actually contains several columns of an ordinary physical file.
What is flat file in as400?
What are key fields?
A field in a record that holds unique data which identifies that record from all the other records in the file or database. Account number, product code and customer name are typical key fields. As an identifier, each key value must be unique in each record.
What is a flat file in as400?
What is multi format logical file in as400?
A multiple-format logical file allows you to use records from two or more physical files by referring to only one logical file. Each record format of such a multiple-format logical file is always associated with one or more physical files. You can use the same physical file in more than one record format.
What is multi format logical file in AS400?
What is join logical file in as400?
A join logical file is a logical file that combines (in one record format) fields from two or more physical files. In the record format, not all the fields need to exist in all the physical files.
What are the keywords used at file level?
UNIQUE, LIFO, FIFO, FCFO, REF are the keywords used at file level. UNIQUE: A record cannot be entered or copied into a file if its key value is same as the key value of a record already existing in the file. FIFO: The duplicate key records will retrieved in first in first out order.
When to use an alias in RPG code?
More recently the alias can be used in your RPG code. When I define a file, in this example a Customer file, I can just reference the field in the reference file, rather than have to remember the size of each field.
Can a reference file be used in AS400?
On AS400 and IBM i many of us achieved something similar using a reference file. This file contains the definition of every type of field that could be contained in any of the other files in the application.
What was the biggest improvement on the AS400?
When I first started programming on the AS400 the biggest improvement I encountered, compared to the System/36, was the external database. No longer did I have to have file specifications in my RPG programs, and I now had the ability to define fields by referencing another.