CREATE TABLE "karaikudi_ssa_bsnl" (
  "sl_no" real,
  "name_of_the_city" text,
  "address" text,
  "contact_person" text,
  "telephone_no" text,
  "facilities_offered" text
);

Question: What was the SlNo no of contact person SDE (P), Thiruppattur?
SQL: SELECT "sl_no" FROM "karaikudi_ssa_bsnl" WHERE "contact_person"='SDE (P), Thiruppattur';