CREATE TABLE table_20314 ("Series" TEXT, "Episodes" FLOAT, "Series premiere" TEXT, "Series finale" TEXT, "Region 1" TEXT, "Region 2" TEXT, "Region 4" TEXT)

What is the region 1 date for series 4
SELECT "Region 1" FROM table_20314 WHERE "Series" = '4'
SELECT "Region 1" FROM "table_20314" WHERE "Series" = '4'