diff --git a/banque.md b/banque.md
index 2fae86d..abf63b9 100644
--- a/banque.md
+++ b/banque.md
@@ -597,10 +597,16 @@ ERROR:  La somme des parts (1.1000) doit être égale à 1.0000
 
 ```sql
 create table currency (
-  code text primary key
+  "code" text primary key
 );
 ```
 
+```sql
+insert into currency values ('EUR');
+insert into currency values ('YEN');
+```
+
+
 ```sql
 create table exchange_rate (
   "currency_code" text references currency(code) on delete cascade,
@@ -610,6 +616,15 @@ create table exchange_rate (
 );
 ```
 
+```sql
+insert into exchange_rate values
+  ('YEN', '2025-11-03', 177.57),
+  ('YEN', '2025-11-04', 176.39),
+  ('YEN', '2025-11-05', 176.67),
+  ('YEN', '2025-11-06', 177.15),
+  ('YEN', '2025-11-07', 176.99);
+```
+
 ### 4. Les opérations et transactions
 
 Implémenter les transactions et opérations.
@@ -618,7 +633,7 @@ Implémenter les transactions et opérations.
 create table transaction (
   "id" bigint primary key generated always as identity,
   "transaction_date" timestamp default current_timestamp,
-  amount decimal check (amount > 0)
+  "amount" decimal check (amount > 0)
 );
 ```
 
@@ -627,7 +642,7 @@ create table operation (
   "id" bigint primary key generated always as identity,
   "transaction_id" bigint references transaction(id),
   "account_id" bigint references account(id),
-  amount decimal check (amount > 0),
-  direction text check (direction in ('DEBIT', 'CREDIT'))
+  "amount" decimal check (amount > 0),
+  "direction" text check (direction in ('DEBIT', 'CREDIT'))
 );
 ```