Specifies that the DESCRIBE statement writes information about
    input parameter markers to the SQLDA. The MARKERS or INPUT clause
    specifies that the DESCRIBE statement writes information about
    the number and data types of any input parameter markers in the
    prepared statement to the SQLDA.

    Input parameter markers in a prepared statement serve the same
    purpose as host language variables in nondynamic, embedded SQL
    statements. The program can use that information in the SQLDA
    to allocate storage. The program must supply values in that
    allocated storage. SQL substitutes these values for the parameter
    markers when it dynamically executes the prepared statement.