CREATE TABLE table_12100 ("Date" TEXT, "Epicenter" TEXT, "Magnitude" TEXT, "Intensity" TEXT, "Casualties" TEXT)

What is the magnitude of the earthquake with an epicenter in biskra province?
SELECT "Magnitude" FROM table_12100 WHERE "Epicenter" = 'biskra province'
SELECT "Magnitude" FROM "table_12100" WHERE "Epicenter" = 'biskra province'