CREATE TABLE table_30811 ("Series #" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" FLOAT)

What is the production code for 'State of Grace'?
SELECT MAX("Production code") FROM table_30811 WHERE "Title" = 'State of Grace'
SELECT MAX("Production code") FROM "table_30811" WHERE "Title" = 'State of Grace'