1.使用WHERE子句
2.WHERE子句的操作符
select prod_name,prod_price from products where prod_price = 2.5; // 检查单个值 select cust_name,cust_city from customer where cust_city = 'Chicago'; // 检查单个值 select prod_name,prod_price from products where prod_price != 2.5; // 不匹配检查 select prod_name,prod_price from products where prod_price >= 1; // 范围查询 select prod_name,prod_price from products where prod_price is null; // 空值检查 select prod_name,prod_price from products where prod_price is not null; // 空值检查
3.小结
