winscp软件ALTER TABLE "area info" ALTER "ci" DROP DEFAULT ALTER "lac" DROP DEFAULT; ALTER TABLE "area info" CHANGE COLUMN "ci" "ci" VARCHAR 20 NOT NULL AFTER "city" CHANGE COLUMN "lac" "lac" VARCHAR 20 NOT NULL AFTER "ci";">winscp软件ALTER TABLE "area info" ALTER "ci" DROP DEFAULT ALTER "lac&quo t; DROP DEFAULT; ALTER TABLE "area info" CHANGE COLUMN "ci" "ci" VARCHAR 20 NOT NULL AFTER "city" CHANGE COLUMN "lac" "lac" VARCHAR 20 NO [更多] t; DROP DEFAULT; ALTER TABLE "area info" CHANGE COLUMN "ci" "ci" VARCHAR 20 NOT NULL AFTER "city" CHANGE COLUMN "lac" "lac" VARCHAR 20 NO [更多]