LIKE

语法说明

LIKE 操作符用于在 WHERE 子句中搜索列中的指定模式。

有两个通配符经常与 LIKE 操作符一起使用：

  • 百分号 (%) 代表了 0、1 或多个字符。
  • 下划线 (_) 代表单个字符。

语法结构

  1. > SELECT column1, column2, ...
  2. FROM table_name
  3. WHERE columnN LIKE pattern;

示例

  1. mysql> SELECT * FROM Customers
  2. WHERE CustomerName LIKE 'a%'; //The following SQL statement selects all customers with a CustomerName starting with "a"
  4. mysql> SELECT * FROM Customers
  5. WHERE CustomerName LIKE '%a'; //The following SQL statement selects all customers with a CustomerName ending with "a"
  7. mysql> SELECT * FROM Customers
  8. WHERE CustomerName LIKE '%or%'; //The following SQL statement selects all customers with a CustomerName that have "or" in any position
  10. mysql> SELECT * FROM Customers
  11. WHERE CustomerName LIKE '_r%'; //The following SQL statement selects all customers with a CustomerName that have "r" in the second position
  13. mysql> SELECT * FROM Customers
  14. WHERE CustomerName LIKE 'a__%'; //The following SQL statement selects all customers with a CustomerName that starts with "a" and are at least 3 characters in length
  16. mysql> SELECT * FROM Customers
  17. WHERE ContactName LIKE 'a%o'; //The following SQL statement selects all customers with a ContactName that starts with "a" and ends with "o"
  19. mysql> SELECT * FROM Customers
  20. WHERE CustomerName NOT LIKE 'a%'; //The following SQL statement selects all customers with a CustomerName that does NOT start with "a"