CREATE TABLE table_28246 ("Metropolitan ring" TEXT, "Localities" FLOAT, "Total" FLOAT, "Jews and others 1" FLOAT, "Thereof: Jews" FLOAT, "Arabs" FLOAT, "Population density  ( per km\\u00b2 ) " TEXT, "Annual Population growth rate" TEXT)

What is the metropolitan ring when thereof: jews is 30600?
SELECT "Metropolitan ring" FROM table_28246 WHERE "Thereof: Jews" = '30600'
SELECT "Metropolitan ring" FROM "table_28246" WHERE "Thereof: Jews" = '30600'