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PROCEDURE DIVISION statements for the indexed files:
All the statements which are available for a relative file are also available for an indexed file.
READ STTATEMENT :
When either the RANDOM or DYNAMIC access mode is specified or the records are to be read in a random manner, the syntax is as shown below:
READ file-name RECORD [ INTO IDENTIFIER ]
[ ; KEY IS data-name ]
[ ; INVALID KEY imperative-statement ]
The data name in the KEY IS phrase should be either the prime key or the alternative key item. If the phrase is not specified, then the prime key is supposed. Let consider PERSONNEL be an indexed file and let EMP-NO be the prime key and NAME be the alternative key.
BLOCK CONTAINS CLAUSE: Integer -1 of the BLOCK CONTAINS clause indicates the block size either in terms of records or in terms of characters. For illustration, BLOCK CONTAINS
WRITE Statement: The WRITE statement for a relative file has the format which is as shown below. WRITE record-name [ FORM identifier ]
Numeric - Literals : The numeric literal can be created with the help of digits only. It can have a sign (+ or -) and can also have a decimal point. If no sign is specifi
Example of condition names: The illustration below is of the use of the condition names 77 MARITAL-STATUS PIC 9 88 SINGLE VALUE IS ZERO 88 MA
COBOL Words: The COBOL word can be formed by using the characters as shown below: 0-9 A-Z (a-z) - (hyphen) The rules below should be hold in forming the COBOL words.
THE SIMPLE SORT VERB: The process of sequencing the records in some preferred manner is termed as sorting. The Sorting is done upon some key data item in the record. For illus
OCCURS - INDEXED BY PROGRAM: identification division. program- id. searching. environment division. data division. working-storage section. 01 table1. 0
RELATIONAL CONDITION: We know that a relational condition specifies a comparison between two operands and has the form. Operand-1 relational-operator operand-2
SEQUENTIAL FILES: The purpose of the proposed section is to introduce the concepts such as File characteristics, File Description for Fixed-Length Records, File-Control
ADD VERB: The ADD Verb can be used to find the sum of two or more numbers and to store the sum. The ADD verb takes any one of the two forms as shown below:
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