CREATE TABLE table_204_54 (id DECIMAL, "pondicherry assembly" TEXT, "duration" TEXT, "name of m.l.a." TEXT, "party affiliation" TEXT, "election year" DECIMAL)

how many assemblies have their been ?
SELECT COUNT(DISTINCT "pondicherry assembly") FROM table_204_54
SELECT COUNT(DISTINCT "pondicherry assembly") FROM "table_204_54"