What's the total value of សាមសិប?
CREATE TABLE "numbers_from_30_90" (
  "value" real,
  "khmer" real,
  "word_form" text,
  "ungegn" text,
  "ala_lc" text,
  "other" text
);
SELECT SUM("value") FROM "numbers_from_30_90" WHERE "word_form"='សាមសិប';