CREATE TABLE table_55221 ("NGC number" FLOAT, "Object type" TEXT, "Constellation" TEXT, "Right ascension  (  J2000  ) " TEXT, "Declination  (  J2000  ) " TEXT)

I want the NGC number for leo of irregular galaxy
SELECT "NGC number" FROM table_55221 WHERE "Constellation" = 'leo' AND "Object type" = 'irregular galaxy'
SELECT "NGC number" FROM "table_55221" WHERE "Constellation" = 'leo' AND "Object type" = 'irregular galaxy'