diff --git a/write_to_db.py b/write_to_db.py
index 27d779b..5e83df1 100644
--- a/write_to_db.py
+++ b/write_to_db.py
@@ -21,10 +21,10 @@ engine = create_engine(connection_string)
 
 # Define a list of file paths and corresponding table names
 file_paths = [
-    ('sec_data/2024q1/num.txt', 'num'),
-    ('sec_data/2024q1/pre.txt', 'pre'),
-    ('sec_data/2024q1/sub.txt', 'sub'),
-    ('sec_data/2024q1/tag.txt', 'tag')
+    ('sec_data/2009q3/sub.txt', 'sub'),
+    ('sec_data/2009q3/tag.txt', 'tag'),
+    ('sec_data/2009q3/num.txt', 'num'),
+    ('sec_data/2009q3/pre.txt', 'pre')
 ]
 
 # Loop through each file and write the data to the database
@@ -47,8 +47,14 @@ for i, (file_path, table_name) in enumerate(file_paths):
     print("\nMissing Values:")
     print(missing_values)
     
+    # If the file being processed is 'num.txt', fix the `coreg` column
+    if table_name == 'num':
+        df['coreg'] = df['coreg'].fillna('nocoreg')
+        print("\nUpdated 'coreg' column (NaN values replaced with 'nocoreg'):")
+        print(df[['coreg']].head(10))  # Display first 10 rows of the 'coreg' column for verification
+    
     # Write the DataFrame to the corresponding table in the MariaDB database
-    df.to_sql(table_name, con=engine, if_exists='replace', index=False)
+    df.to_sql(table_name, con=engine, if_exists='append', index=False)
     print(f"\nData from {file_path} written to the '{table_name}' table in the database.")
 
 print("\nAll files have been processed and written to the database.")
\ No newline at end of file