What information must be provided in the header section of a PL/SQL block for each parameter?  Provide an explanation for each.

What will be an ideal response?


Three pieces of information for each parameter must be provided in the header: name, mode, and data type.

Name: The name should be useful to the programmer for identifying the type of data it represents and must conform to Oracle10g naming standards.
Mode: Values are passed between the application environment or user screens and program units via parameters. Note that three choices exist for the parameter mode: IN, OUT, and IN OUT.

Data type: The data type is the last required item for each parameter. An SQL data type, such as CHAR, NUMBER, or DATE, is needed. It is important to note that no size or precision information is included in the parameter data types.When a procedure is invoked, the size properties of the arguments or values that are supplied to pass into the parameters control the size and precision of the parameters.

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