CREATE TABLE table_20561 ("Code" TEXT, "District" TEXT, "Headquarters" TEXT, "Population  ( 2011 ) " FLOAT, "Area  ( km\\u00b2 ) " FLOAT, "Density  ( /km\\u00b2 ) " FLOAT, "Official website" TEXT)

What was the minimum population in 2011 of the district of Prakasam?
SELECT MIN("Population (2011)") FROM table_20561 WHERE "District" = 'Prakasam'
SELECT MIN("Population (2011)") FROM "table_20561" WHERE "District" = 'Prakasam'