字符串运算符

运算符 ||

运算符 || 用于字符串连接，|| 左右都是字符串类型。

示例

SELECT customer_name, 
       customer_name || 'name', 
       'str1' || 'str2', 
       'str' || Cast(100 AS VARCHAR) 
FROM   t_fact_customers
WHERE  customer_id < 4;
+---------------+---------------+----------+--------+
| customer_name | _col1         | _col2    | _col3  |
+---------------+---------------+----------+--------+
| 王小二         | 王小二name    | str1str2 | str100  |
| 李春梅         | 李春梅name    | str1str2 | str100  |
| 张大山         | 张大山name    | str1str2 | str100  |
+---------------+---------------+----------+--------+