How should I interpret this sequence of records?

What is a sequence of records?

The sequence record can retrieve up to 16 values from 16 locations. The user specifies the locations in the Desired Output Link fields (DOL0-DOLF), which can be either constants, database links, or channel access links.

What is the syntax for reading the record from file?

Syntax. READ file-name NEXT RECORD INTO ws-file-structure AT END DISPLAY ‘End of File’ NOT AT END DISPLAY ‘Record Details:’ ws-file-structure END-READ. NEXT RECORD is optional and is specified when an indexed sequential file is being read sequentially. INTO clause is optional.

How do you read first and last record in Cobol?

PROCEDURE DIVISION. OPEN INPUT MASTER-FILE [code to check FILE STATUS field] PERFORM UNTIL end-of-master-file READ MASTER-FILE [code to check FILE STATUS field] MOVE IN-CODE to w-save-code END-PERFORM DISPLAY “>” w-save-code “<” CLOSE MASTER-FILE [code to check FILE STATUS field] GOBACK .

How do you read old records in Cobol?

For sequential retrieval, code READ NEXT and READ PREVIOUS ; and for random retrieval (by key), use READ . To read sequentially beginning at a specific record, use a START statement to set the file position indicator to point to a particular record before the READ NEXT or the READ PREVIOUS statement.

Why do we need sequences?

It assists with comprehension, especially for narrative texts. Sequence structures help students of varying abilities organize information and ideas efficiently. Sequencing is also an important component of problem-solving across the curriculum, including science and social studies.

What is a sequence in a database?

A sequence is a database object that allows the automatic generation of values, such as check numbers. Sequences are ideally suited to the task of generating unique key values. Applications can use sequences to avoid possible concurrency and performance problems resulting from column values used to track numbers.

What is the rule of read data statement?

The READ statement updates the value of the associated FILE STATUS variable. A successful Format 1 READ statement retrieves a record from the file according to the following rules: The last OPEN, READ, or START verb used for the file determines which record is retrieved.

What is the use of read data statement?

READ statements assign variables to DATA statement values on a one-to-one basis. READ statement variables may be numeric or string, and the values read must agree with the variable types specified. If they do not agree, a “Syntax error” results. A single READ statement may access one or more DATA statements.

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