MySQL必知必会(通配符过滤Like，%，_)

SELECT prod_id, prod_name FROM products 
WHERE prod_name LIKE 'jet%'; #百分号(%)表示任何字符出现任意次数, %不能匹配值为NULL的行。

SELECT prod_id, prod_name FROM products 
WHERE prod_name LIKE '%anvil%';

SELECT prod_id, prod_name FROM products 
WHERE prod_name LIKE 's%e';

SELECT prod_id, prod_name FROM products 
WHERE prod_name LIKE '_ ton anvil'; #和%的用途一样，但下划线只能匹配单个字符。

SELECT prod_id, prod_name FROM products 
WHERE prod_name LIKE '% ton anvil';