MySQL中的CONCAT函數使用教程，mysqlconcat

MySQL中的CONCAT函數使用教程，mysqlconcat

使用MySQL CONCAT()函數將兩個字符串連接起來，形成一個單一的字符串。試試下面的例子：

mysql> SELECT CONCAT('FIRST ', 'SECOND');
+----------------------------+
| CONCAT('FIRST ', 'SECOND') |
+----------------------------+
| FIRST SECOND        |
+----------------------------+
1 row in set (0.00 sec)

了解CONCAT函數更詳細，考慮EMPLOYEE_TBL表具有以下記錄：

mysql> SELECT * FROM employee_tbl;
+------+------+------------+--------------------+
| id  | name | work_date | daily_typing_pages |
+------+------+------------+--------------------+
|  1 | John | 2007-01-24 |        250 |
|  2 | Ram | 2007-05-27 |        220 |
|  3 | Jack | 2007-05-06 |        170 |
|  3 | Jack | 2007-04-06 |        100 |
|  4 | Jill | 2007-04-06 |        220 |
|  5 | Zara | 2007-06-06 |        300 |
|  5 | Zara | 2007-02-06 |        350 |
+------+------+------------+--------------------+
7 rows in set (0.00 sec)

可以用以下命令連結上表中的name和ID：

mysql> SELECT CONCAT(id, name, work_date)
  -> FROM employee_tbl;
+-----------------------------+
| CONCAT(id, name, work_date) |
+-----------------------------+
| 1John2007-01-24       |
| 2Ram2007-05-27       |
| 3Jack2007-05-06       |
| 3Jack2007-04-06       |
| 4Jill2007-04-06       |
| 5Zara2007-06-06       |
| 5Zara2007-02-06       |
+-----------------------------+
7 rows in set (0.00 sec)