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WRITE STATEMENT:
The records are written to be logical place as determined from the value of the record key. The INVALID KEY condition occurs in the cases shown below:
(i) When a try is made to write a record beyond the externally defined boundaries of the file.
(ii) Whenever the file is opened in the OUTPUT mode and the value of the record key is not bigger than the value of the record key for the earlier record written.
(iii) When the value of the record key is equivalent to the record key of a record key already present in the file.
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File Description for the Relative and Indexed Files: The FD entry for a relative or an indexed file is similar to that of a sequential file. Some compilers do not permit varia
Illustration of Divide verb: (a) DIVIDE 5 INTO A. If the value of A is 20, then after execution of this statement the value of A will be 4. The older value of A will be los
NEGATED SIMPLE CONDITION: Any of the easy condition explained can be preceded by the logical operator NOT. The consequence of placing the operator NOT before an easy condition
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
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Data Names and Identifiers: The Data name provides reference to the storage space in the memory where the real value is stored. This value takes part in the operation whene
PROGRAM FOR MASTER FILE MAINTENANCE: We have to write a program to keep the stu-file for which a record has just 2 fields,viz., rno(Roll Number) and name(Student Name). Give t
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