CREATE TABLE table_19137 ("School" TEXT, "Mascot" TEXT, "Conference" TEXT, "National Titles" FLOAT, "Founded" FLOAT)

how many overall championships does concordia university have
SELECT MIN("National Titles") FROM table_19137 WHERE "School" = 'Concordia University'
SELECT MIN("National Titles") FROM "table_19137" WHERE "School" = 'Concordia University'