目录
第二课 检索数据
SELECT cust_id FROM Customers;
SELECT DISTINCT prod_id FROM orderitems ;
SELECT * FROM customers; -- SELECT cust_id FROM customers;
标准答案：SELECT * # SELECT cust_id FROM Customers;
第三课 排序检索数据
SELECT cust_names FROM Customers ORDER BY cust_names DESC;
SELECT cust_id,order_num FROM Orders ORDER BY cust_id,order_date DESC;
SELECT item_num,item_price FROM OrderItems ORDER BY item_num DESC,item_price DESC;
vend_name后面不应该加逗号；ORDER少了BY
第四课 过滤数据
SELECT prod_id,prod_name FROM Products WHERE prod_price=9.49;
SELECT prod_id,prod_name FROM Products WHERE prod_price>=9;
标准答案：SELECT DISTINCT order_num FROM OrderItems WHERE quantity >=100;
SELECT prod_name,prod_price FROM Products WHERE prod_price BETWEEN 3 AND 6
ORDER BY prod_price;
第五课 高级数据过滤
SELECT vend_name FROM Vendors
WHERE vend_name='USA' AND vend_name='CA%' ;
SELECT order_num,prod_id,quantity FROM orderitems
WHERE quantity >=100 AND (prod_id='BR01' OR prod_id='BR02' OR prod_id='BR03');
--标准解法 1
SELECT order_num, prod_id, quantity FROM OrderItems WHERE (prod_id='BR01' OR prod_id='BR02' OR prod_id='BR03') AND quantity >=100;
--标准解法 2
SELECT order_num, prod_id, quantity FROM OrderItems WHERE prod_id IN ('BR01','BR02','BR03') AND quantity >=100;
SELECT prod_name,prod_price FROM products WHERE prod_price BETWEEN 3 AND 6
ORDER BY prod_price;
标准答案：SELECT prod_name, prod_price FROM products WHERE prod_price >= 3 AND prod_price <= 6 ORDER BY prod_price;
ORDER BY应该位于语句的最后
第六课 用通配符进行过滤
SELECT prod_name,prod_desc FROM Products WHERE prod_desc LIKE '%toy%';
SELECT prod_name,prod_desc FROM Product WHERE NOT prod_desc LIKE '%toy%'
ORDER BY prod_name;
SELECT prod_name,prod_desc FROM Product
WHERE prod_desc LIKE '%toy%' AND prod_desc LIKE '%carrots%'
SELECT prod_name,prod_desc FROM Product
WHERE prod_desc LIKE '%toy%carrots%';
