![]() If you will sort the file with an external sort prior to reading it in the cobol program you can remove the duplicates with the SORT keyword EQUALS. ![]() In some versions of COBOL, you could also do an OPEN REVERSED to start from the last record. If it is a VSAM, you could set the key to HIGH-VALUE, do a START which will position you on the last record, and then read sequentially with READ PREVIOUS. How can we read records from bottom in COBOL? Arrays/Internal table are just a linear data representation of the similar type of the data. Internal table(Array) in COBOL is different from DB2 tables. The records/items which stores in the table must have similar properties i.e. The internal table in COBOL is called as ARRAY. Work file is used to hold records while the sort process is in progress. Three files are used in the Sort process in COBOL: Input file is the file which we have to sort either in ascending or descending order. ![]() Internal sort is used to sort files with in a COBOL program. External sorting is required when the data being sorted do not fit into the main memory of a computing device (usually RAM) and instead they must reside in the slower external memory, usually a disk drive. What is external sorting in data structure?Įxternal sorting is a class of sorting algorithms that can handle massive amounts of data. The MERGE statement combines two or more identically sequenced files on a set of specified keys, and during the process makes records available, in merged order, to an output procedure or to an output file. 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. How do you read a flat file in reverse order in COBOL? The format 2 SORT statement sorts table elements according to the specified table keys, and it is especially useful for tables used with SEARCH ALL. You can sort a table by using the format 2 SORT statement. The SORT statement creates a sort file by executing input procedures or by transferring records from another file, sorts the records in the sort file on a set of specified keys, and in the final phase of the sort operation, makes available each record from the sort file, in sorted order to some output procedures or to … How do you sort a table in COBOL? How can we sort in COBOL and declaration? Transfers the records present in the input-file to the work-file. ![]() Opens work-file in I-O mode, input-file in the INPUT mode and output-file in the OUTPUT mode. ![]() SORT work-file ON ASCENDING KEY rec-key1 USING input-file GIVING output-file. ![]()
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