这篇文章主要介绍了MySQL中的CONCAT函数使用教程,是Python入门学习中的基础知识,需要的朋友可以参考下
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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