MySQL中的CONCAT函数使用教程
(编辑:jimmy 日期: 2024/11/16 浏览:3 次 )
使用MySQL CONCAT()函数将两个字符串连接起来,形成一个单一的字符串。试试下面的例子:
mysql> SELECT CONCAT('FIRST ', 'SECOND'); +----------------------------+ | CONCAT('FIRST ', 'SECOND') | +----------------------------+ | FIRST SECOND | +----------------------------+ 1 row in set (0.00 sec)
了解CONCAT函数更详细,考虑EMPLOYEE_TBL表具有以下记录:
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)
可以用以下命令连结上表中的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)
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