How do I sort files in Cobol program?

Syntax

1. Opens work-file in I-O mode, input-file in the INPUT mode and output-file in the OUTPUT mode.
2. Transfers the records present in the input-file to the work-file.
3. Sorts the SORT-FILE in ascending/descending sequence by rec-key.
4. Transfers the sorted records from the work-file to the output-file.

How do I sort a dataset in mainframe?

To use DFSORT directly (JCL-invoked), write a SORT control statement to describe the control fields, and the order in which you want them sorted. The control statements you write are part of the SYSIN data set in the JCL.

Can we sort array in Cobol?

In CICS you don’t have access to system sort so you’ll have to implement a sort algorithm against the array. Code: 01 SAVE-CODE1 PIC 9(9) VALUE SPACES. 01 SAVE-CODE2 PIC S9(9) VALUE SPACES.

What is SD Cobol?

In a COBOL program, the File Description (FD) Entry (or Sort Description (SD) Entry for sort/merge files) represents the highest level of organization in the File Section.

What is sorting and merging files?

The sort operation accepts unsequenced input and produces output in a specified sequence. The merge operation compares two or more sequenced files and combines them in sequential order.

How do you use SUM fields in sort?

JCL – SORT SUM Fields The SUM control statement specifies that, whenever two records are found with equal sort or merge control fields, the contents of their summary fields are to be added, the sum is to be placed in one of the records, and the other record is to be deleted.

Why would we sort a table?

Sorting is also often useful for canonicalizing data and for producing human-readable output. Formally, the output of any sorting algorithm must satisfy two conditions: The output is in monotonic order (each element is no smaller/larger than the previous element, according to the required order).

What is internal table in Cobol?

The internal table in COBOL is called as ARRAY. The records/items which stores in the table must have similar properties i.e. PIC clause. Arrays/Internal table are just a linear data representation of the similar type of the data. It is not a physical table. The Table is divided into ROWS and COLUMNS.

What is 66 level used for in COBOL?

The 66 level assigns an alternate name to a field or group. It doesn’t add a new field to the record, it just assigns an alternate name to an existing field. You must use the level number 66 for data description entries that contain the RENAMES clause.

How do you record a reverse order in COBOL?

procedure division. begin. open input file1 reversed output file2 perform read-file1 perform until eof-file1 write file2-rec from file1-rec perform read-file1 end-perform close file1 file2 stop run .

What is the use of sort in COBOL?

COBOL – Internal Sort 1 External sort is used to sort files by using the SORT utility in JCL. We have discussed this in the JCL chapter. As of… 2 Internal sort is used to sort files within a COBOL program. SORT verb is used to sort a file. More

What is the use of sort in SQL?

The SORT statement accepts records from one or more files, sorts them according to the specified keys, and makes the sorted records available either through an output procedure or in an output file. See also MERGE statement. The SORT statement can appear anywhere in the procedure division except in the declarative portion.

What is duplicates in COBOL?

The order in which these records are released by an input procedure, when an input procedure is specified. If the DUPLICATES phrase is not specified, the order of these records is undefined. For more information about use of the DUPLICATES phrase, see the related discussion of alternate indexes in Indexing in the Enterprise COBOL Programming Guide.

What are the different types of COBOL verbs?

COBOL – File Handling Verbs. 1 Open Verb. Open is the first file operation that must be performed. If Open is successful, then only further operations are possible on a file. Only 2 Read Verb. 3 Write Verb. 4 Rewrite Verb. 5 Delete Verb.