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banque/banque.1.tables.sql

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+drop schema if exists bank cascade;
+create schema bank;
+set search_path TO bank;
+
+/*
+ * Holder : table commune à tous les titulaires
+ */
+create type holder_type as enum ('BANK', 'PERSON', 'COMPANY');
+
+create table holder (
+  "id" bigint primary key generated always as identity,          -- identifiant unique
+  "type" holder_type not null,
+  "created_at" timestamp not null default current_timestamp      -- date et heure de création
+);
+
+/*
+ * Bank
+ */
+create table bank (
+  "id" bigint primary key references holder(id),          -- identifiant unique
+  "name" text not null
+);
+
+/*
+ * Person
+ */
+create table person (
+  "id" bigint primary key references holder(id) on delete cascade,
+  "firstname" text not null,
+  "lastname" text not null,
+  "birthdate" date not null check (birthdate <= current_date - interval '15 years')
+);
+
+/*
+ * Company
+ */
+create table company (
+  "id" bigint primary key references holder(id) on delete cascade,
+  "name" text not null,
+  "registration_number" text unique not null,
+  "created_at" date not null
+);
+
+create table currency (
+  "code" text primary key
+);
+
+create table exchange_rate (
+  "currency_code" text references currency(code) on delete cascade,
+  "date" date ,
+  "rate" decimal not null,
+  primary key (currency_code, date)
+);
+
+/*
+ * Account
+ * La contrainte check (balance >= 0) empêche les soldes négatifs
+ */
+create table account (
+  "id" bigint primary key generated always as identity,
+  "opened_at" date not null default current_date,
+  "balance" numeric(18,6) not null default 0 check (balance >= 0),
+  "currency_code" text not null references currency (code)
+);
+
+/*
+ * Account -> Holder
+ * Cette table établit la relation n–n entre account et holder.
+ * Un compte joint correspond donc à plusieurs lignes dans cette table.
+ * La contrainte share assure que les parts sont comprises entre 0 et 1.
+ */
+create table account_holder (
+  "account_id" int not null references account(id) on delete cascade,
+  "holder_id" int not null references holder(id) on delete cascade,
+  "share" decimal(4,3) not null default 1 check (share > 0 and share <= 1),
+  primary key (account_id, holder_id)
+);
+
+
+create table transaction (
+  "id" bigint primary key generated always as identity,
+  "transaction_date" timestamp not null default current_timestamp,
+  amount decimal not null check (amount > 0)
+);
+
+create table operation (
+  "id" bigint primary key generated always as identity,
+  "transaction_id" bigint not null references transaction(id),
+  "account_id" bigint not null references account(id),
+  amount decimal not null check (amount > 0),
+  direction text not null check (direction in ('DEBIT', 'CREDIT'))
+);