ห้างสาขาภาคใต้มีกี่ห้างสรรพสินค้า?
How many department stores does the store chain South have?
df_department_stores = pd.DataFrame(columns=['dept_store_chain_id']); df_department_store_chain = pd.DataFrame(columns=['dept_store_chain_id', 'dept_store_chain_name'])
df_department_stores[df_department_stores['dept_store_chain_id'].isin(df_department_store_chain[df_department_store_chain['dept_store_chain_name'] == 'South']['dept_store_chain_id'])].shape[0]