Fix issues in sql statements

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/dao/impl/ApplicationMappingDAOImpl.java

@@ -102,7 +102,7 @@ public class ApplicationMappingDAOImpl implements ApplicationMappingDAO {
         Connection conn;
         PreparedStatement stmt = null;
         try {
-            String sql = "DELETE DM_DEVICE_APPLICATION_MAPPING WHERE DEVICE_ID = ? AND " +
+            String sql = "DELETE FROM DM_DEVICE_APPLICATION_MAPPING WHERE DEVICE_ID = ? AND " +
                     "APPLICATION_ID = ? AND TENANT_ID = ?";
 
             conn = this.getConnection();
@@ -114,7 +114,7 @@ public class ApplicationMappingDAOImpl implements ApplicationMappingDAO {
                 stmt.execute();
             }
         } catch (SQLException e) {
-            throw new DeviceManagementDAOException("Error occurred while adding device application mapping", e);
+            throw new DeviceManagementDAOException("Error occurred while removing device application mapping", e);
         } finally {
             DeviceManagementDAOUtil.cleanupResources(stmt, null);
         }

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/dao/impl/EnrollmentDAOImpl.java

@@ -129,7 +129,7 @@ public class EnrollmentDAOImpl implements EnrollmentDAO {
         int status = -1;
         try {
             conn = this.getConnection();
-            String sql = "DELETE DM_ENROLMENT WHERE DEVICE_ID = ? AND OWNER = ? AND TENANT_ID = ?";
+            String sql = "DELETE FROM DM_ENROLMENT WHERE DEVICE_ID = ? AND OWNER = ? AND TENANT_ID = ?";
             stmt = conn.prepareStatement(sql, new String[] {"id"});
             stmt.setInt(1, deviceId);
             stmt.setString(2, currentOwner);