CREATE TABLE table_17748 ("District" TEXT, "Counties Represented" TEXT, "Delegate" TEXT, "Party" TEXT, "First Elected" FLOAT, "Committee" TEXT)

What are the districts represented by the Democratic Party and a Committee in Economic Matters?
SELECT "District" FROM table_17748 WHERE "Committee" = 'Economic Matters' AND "Party" = 'Democratic'
SELECT "District" FROM "table_17748" WHERE "Committee" = 'Economic Matters' AND "Party" = 'Democratic'