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FILE-CONTROL paragraph for the indexed files:
The common format for the SELECT clause for a file is as shown below:
SELECT file-name ASSIGN TO implementor -name
The ORGANIZATION clause specifies that the file is an indexed file. The RECORD KEY clause indicates the record key data item on the basis of which the file is sequenced. The field that is specified in the RECORD KEY clause (data-name-1) is also termed as the primary key. Whereas the files are stored on the basis of the prime key, that is the records of an alternative key.
LABEL RECORD CLAUSE: This clause specifies whether or not the standard header and trailer labels must be present in the magnetic-tape files. VALUE OF CLAUSE: The VAL
Illustration of indexed tables: Index items defined through the INDEXED phrase of the OCCURS clause are one type of indexes. There can be other type of index items that are de
Transaction file : A transaction file is a file which contains new records those changes to old records which are used to update the master file. The problem of file updatio
Edit Characters for Numeric Data: The characters below can be used in the PICTURE clause to indicate the editing. Z * $ - + CR DB . , B O /
UPDATING OF THE RELATIVE AND INDEXED FILES: The Sequential files are updated by creating a new master file from an existing old master file and a transaction file. Such an Upda
FD Entry for variable-length Records: The RECORDS CONTAINS and BLOCK CONTAINS clause are quite dissimilar in the case of files with variable- length records. The syntax of the
Illustration of Subtract verb: (a) SUBTRACT A FROM B. This illustration means that the value of A will be subtracted from the value of B and the subtracted result will be s
Direct Organization: Besides the relative or indexed organization, also a direct access file can be designed to have what is termed as direct organization. In this organizati
Example of Perform statement: PERFORM BEGIN-CALCULATION THRU END-CALCULATION. Assume, BEGIN-CALCULATION and END-CALCULTION is paragraph names. The execution of the PERFORM
Size: The number of characters or digits needed to store the data item in the memory in termed as the Size of the data item. All the 4 general characteristics explained can
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