Specifies an SQLDA descriptor that contains addresses and data
    types of input parameters or variables.

    The descriptor must be a structure declared in the host language
    program as an SQLDA. If the program is precompiled and uses the
    embedded SQL statement INCLUDE SQLDA, the name of the structure
    is simply SQLDA. Programs can use multiple SQLDAs, but must
    explicitly declare them with names other than SQLDA.

    Programs can always use the USING DESCRIPTOR clause of the
    EXECUTE statement whether or not the statement string contains
    input parameter markers, as long as the value of the SQLD
    field in the SQLDA corresponds to the number of input parameter
    markers. SQL updates the SQLD field with the correct number of
    input parameter markers when it processes the DESCRIBE statement
    for the statement string.