CREATE TABLE table_43599 ("Name" CLOB, "Hanzi" CLOB, "Hanyu Pinyin" CLOB, "Population  ( 2004 est. ) " CLOB, "Area  ( km\\u00b2 ) " CLOB, "Density  ( /km\\u00b2 ) " CLOB)

What is the density of ?
SELECT "Density (/km\u00b2)" FROM table_43599 WHERE "Hanzi" = '昌黎县'
SELECT "Density (/km\u00b2)" FROM "table_43599" WHERE "Hanzi" = '昌黎县'