CREATE TABLE table_1994 ("Rank" FLOAT, "London Borough" CLOB, "Black African Population" FLOAT, "Black Caribbean Population" FLOAT, "Other Black Population" FLOAT, "Total Black Population" FLOAT)

Where are the london borough with the black caribbean population of 17974?
SELECT "London Borough" FROM table_1994 WHERE "Black Caribbean Population" = '17974'
SELECT "London Borough" FROM "table_1994" WHERE "Black Caribbean Population" = '17974'