🔖 SQL必知必会源码

codes/mysql/sql必知必会示例/select.sql

@@ -96,3 +96,105 @@ WHERE (vend_id = 'DLL01' OR vend_id = 'BRS01') AND prod_price >= 10;
 SELECT *
 FROM products
 WHERE prod_price NOT BETWEEN 3 AND 5;
+
+-- -------------------------------------------
+-- 通配符
+-- -------------------------------------------
+SELECT prod_id, prod_name, prod_price
+FROM products
+WHERE prod_name LIKE 'Fish%';
+
+SELECT prod_id, prod_name, prod_price
+FROM products
+WHERE prod_name LIKE '%bean bag%';
+
+SELECT prod_id, prod_name, prod_price
+FROM products
+WHERE prod_name LIKE 'F%y';
+
+SELECT prod_id, prod_name, prod_price
+FROM products
+WHERE prod_name LIKE '__ inch teddy bear';
+
+SELECT prod_id, prod_name, prod_price
+FROM products
+WHERE prod_name LIKE '% inch teddy bear';
+
+-- -------------------------------------------
+-- 排序和分组
+-- -------------------------------------------
+
+SELECT vend_id, COUNT(*) AS num
+FROM products
+GROUP BY vend_id;
+
+SELECT cust_id, COUNT(*) AS orders
+FROM orders
+GROUP BY cust_id
+HAVING COUNT(*) >= 2;
+
+SELECT order_num, COUNT(*) AS items
+FROM orderitems
+GROUP BY order_num
+HAVING COUNT(*) >= 3
+ORDER BY items, order_num;
+
+-- -------------------------------------------
+-- 子查询
+-- -------------------------------------------
+
+SELECT cust_id
+FROM orders
+WHERE order_num IN (SELECT order_num
+                    FROM orderitems
+                    WHERE prod_id = 'RGAN01');
+
+SELECT cust_name, cust_contact
+FROM customers
+WHERE cust_id IN (SELECT cust_id
+                  FROM orders
+                  WHERE order_num IN (SELECT order_num
+                                      FROM orderitems
+                                      WHERE prod_id = 'RGAN01'));
+
+-- -------------------------------------------
+-- 连接
+-- -------------------------------------------
+
+-- 内连接
+SELECT vend_name, prod_name, prod_price
+FROM vendors INNER JOIN products
+ON vendors.vend_id = products.vend_id;
+
+-- 自连接
+SELECT c1.cust_id, c1.cust_name, c1.cust_contact
+FROM customers c1, customers c2
+WHERE c1.cust_name = c2.cust_name
+AND c2.cust_contact = 'Jim Jones';
+
+-- 自连接
+SELECT c.*, o.order_num, o.order_date,
+       oi.prod_id, oi.quantity, oi.item_price
+FROM customers c, orders o, orderitems oi
+WHERE c.cust_id = o.cust_id
+AND oi.order_num = o.order_num
+AND prod_id = 'RGAN01';
+
+-- 左连接
+SELECT customers.cust_id, orders.order_num
+FROM customers LEFT JOIN orders
+ON customers.cust_id = orders.cust_id;
+
+-- 右连接
+SELECT customers.cust_id, orders.order_num
+FROM customers RIGHT JOIN orders
+ON customers.cust_id = orders.cust_id;
+
+-- 组合
+SELECT cust_name, cust_contact, cust_email
+FROM customers
+WHERE cust_state IN ('IL', 'IN', 'MI')
+UNION
+SELECT cust_name, cust_contact, cust_email
+FROM customers
+WHERE cust_name = 'Fun4All';