tests: improved sql dumps, renamed pgsql -> postgre

tests/dibi/data/postgre.sql

@@ -0,0 +1,52 @@
+SET client_encoding = 'UTF8';
+DROP SCHEMA IF EXISTS public CASCADE;
+CREATE SCHEMA public;
+
+CREATE TABLE products (
+	product_id serial NOT NULL,
+	title varchar(100) NOT NULL,
+	PRIMARY KEY (product_id)
+);
+
+INSERT INTO products (product_id, title) VALUES
+(1,	'Chair'),
+(2,	'Table'),
+(3,	'Computer');
+SELECT setval('products_product_id_seq', 3, TRUE);
+
+CREATE INDEX title ON products USING btree (title);
+
+CREATE TABLE customers (
+	customer_id serial NOT NULL,
+	name varchar(100) NOT NULL,
+	PRIMARY KEY (customer_id)
+);
+
+INSERT INTO customers (customer_id, name) VALUES
+(1, 'Dave Lister'),
+(2, 'Arnold Rimmer'),
+(3, 'The Cat'),
+(4, 'Holly'),
+(5, 'Kryten'),
+(6, 'Kristine Kochanski');
+SELECT setval('customers_customer_id_seq', 6, TRUE);
+
+CREATE TABLE orders (
+	order_id serial NOT NULL,
+	customer_id integer NOT NULL,
+	product_id integer NOT NULL,
+	amount real NOT NULL
+);
+
+INSERT INTO orders (order_id, customer_id, product_id, amount) VALUES
+(1, 2, 1, 7),
+(2, 2, 3, 2),
+(3, 1, 2, 3),
+(4, 6, 3, 5);
+SELECT setval('orders_order_id_seq', 4, TRUE);
+
+ALTER TABLE ONLY orders
+    ADD CONSTRAINT orders_customer_id_fkey FOREIGN KEY (customer_id) REFERENCES customers(customer_id) ON UPDATE CASCADE ON DELETE RESTRICT;
+
+ALTER TABLE ONLY orders
+    ADD CONSTRAINT orders_product_id_fkey FOREIGN KEY (product_id) REFERENCES products(product_id) ON UPDATE CASCADE ON DELETE RESTRICT;