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INDEXED TABLES:
The OCCURS clause that is used to define tables can optionally have an INDEXED phrase. This phrase involves the names of data items which are to be used as subscripts to specify table elements. These data item is termed as index. The illustration below describes the table description with the INDEXED phrase.
The reference to an element of this table can be completed as YEAR (F1, D1, Y1) having set suitable values to the index names F1, D1 and Y1.
The common form of the INDEXED phrase is as shown below:
INDEXED BY index-name-1 [, index-name-2]...
The OCCURS clause with an INDEXED phrase takes the form as shown below:
Edit Characters for Numeric Data: The characters below can be used in the PICTURE clause to indicate the editing. Z * $ - + CR DB . , B O /
FILE STATUS clause: This clause has been involved in the above syntax for completeness. The ORGANIZATION, REVERSE, ACCESS and STATUS clause can be specified in any order.
Examples - Edit characters for numeric data: The following illustration illustrates the use of Z editing characters. The character b is used to indicate the space character an
what does it used
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CLOSE STATEMENT: When the processing of a file is completed, then the file may be closed. This is completed with the help of the CLOSE-verb. The form of the CLOSE statement is
Comparison of the Numeric Operand with Nonnumeric Operand: The numeric operand can be compared to the nonnumeric operand subject to the restrictions which are as follows.
FILE-CONTROL: The FILE-CONTROL paragraph names each and every file and identifies the first medium through file control entries. The basic format of a file control entry is gi
RULES FOR INDEXED TABLES: The rules of indexing a table with an INDEXED phrase are as shown below: (1) If indexing is completed for any one level of a table, then indexing
ACCEPT STATEMENT: The ACCEPT statement is used to read the low-volume data from the operator's console, several other hardware device or from the operating system. The common
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