This is the statement for creating the external table.
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create table dummy1(
"SRCPHNUM" number(10),
"SRCNAME" varchar2(20),
"SRCLOCATION" varchar2(20),
"DESTNPHNUM" number(10),
"DESTNAME" varchar2(20),
"DESTLOCATION"varchar2(20),
"CALLTIME" number(3),
"COMMENTS"...