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MySQL中的CONCAT函数使用教程

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Release: 2016-06-07 15:36:54
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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: ? 1 2 3 4 5 6 7 mysql SELECT CONCAT('FIRST ', 'SECOND'); +--

   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:

  ?

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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:

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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:

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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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