can't select the multiple table from sqlite database using iPhone?

Question

Possible Duplicate:
Open two tables from one SqlLite db in one iPhone Class?

I'm using one database contain multiple table but i can't select the 2nd table from the database. i can select only one table from db. i'm using sqlite database in iPhone application

This is my code

  - (void)viewDidLoad {
      [super viewDidLoad];
      list = [[NSMutableArray alloc] init];
       if ([material isEqualToString:@"Derlin"]) {
       [self sel1];
     }
      else if([material isEqualToString:@"Helers"]){
     [self sel2];    
   }
 }
  -(void)sel1 {
        [self createEditableCopyOfDatabaseIfNeeded];
        NSLog(@"numberOfRowsInSection");
        sqlite3_stmt *statement = nil;  // create a statement
        const char *sql = "Select * from material";  //create a query to display in the tableView
       if(sqlite3_open([writableDBPath UTF8String], &database) == SQLITE_OK) 
       {
            NSLog(@"sqlite3_open");
            if(sqlite3_prepare_v2(database, sql,-1, &statement, NULL)!=SQLITE_OK) 
                NSAssert1(0,@"Error Preparing Statement",sqlite3_errcode(database));    

            else
            {
              while(sqlite3_step(statement) == SQLITE_ROW) // if the connection exists return the row of the query table
               {
                 achemical = [NSString stringWithFormat:@"%s",(char *)sqlite3_column_text(statement,0)];
                 arates = [NSString stringWithFormat:@"%s",(char *)sqlite3_column_text(statement,1)];
                 anotes = [NSString stringWithFormat:@"%s",(char *)sqlite3_column_text(statement,2)];

               Chemical * chemic = [[Chemical alloc] initWithName:achemical rates:arates notes:anotes];

               [list addObject:chemic];
               [chemic release];
             }

         } 
      }
      sqlite3_finalize(statement);
     }
     -(void)sel2 {
               [self createEditableCopyOfDatabaseIfNeeded];
               NSLog(@"numberOfRowsInSection"); 
               sqlite3_stmt *statement = nil;  // create a statement
               const char *sql = "Select * from material1";  //create a query to display in the tableView
               if(sqlite3_open([writableDBPath UTF8String], &database) == SQLITE_OK) 
               {
                NSLog(@"sqlite3_open");
                if(sqlite3_prepare_v2(database, sql,-1, &statement, NULL)!=SQLITE_OK) 
                NSAssert1(0,@"Error Preparing Statement",sqlite3_errcode(database)); 

               else
               {
                while(sqlite3_step(statement) == SQLITE_ROW) // if the connection exists return the row of the query table
               {
                achemical = [NSString stringWithFormat:@"%s",(char *)sqlite3_column_text(statement,0)];
                arates = [NSString stringWithFormat:@"%s",(char *)sqlite3_column_text(statement,1)];
                anotes = [NSString stringWithFormat:@"%s",(char *)sqlite3_column_text(statement,2)];
                Chemical * chemic = [[Chemical alloc] initWithName:achemical rates:arates notes:anotes];

                [list addObject:chemic];
                [chemic release];
                }
             }
           }
        sqlite3_finalize(statement);
      }