Update data type in duckdb

Author: prrao87

ddl/insert_data_duckdb.sql

@@ -8,12 +8,12 @@ FROM read_csv(
 );
 
 CREATE OR REPLACE TABLE Account AS
-SELECT id, account_id, owner, CAST(balance AS DOUBLE) AS balance
+SELECT id, account_id, owner, balance
 FROM read_csv(
     'data/account.csv',
     header = true
 );
 
 CREATE OR REPLACE TABLE Transfer AS
-SELECT source, target, CAST(amount AS DOUBLE) AS amount
+SELECT source, target, amount
 FROM read_csv('data/transfer.csv', header = true);