MySQL中的CONCAT函數使用教程

 　　這篇文章主要介紹了MySQL中的CONCAT函數使用教程,是Python入門學習中的基礎知識,需要的朋友可以參考下

　　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：

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1 2 3 4 5 6 7 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：

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1 2 3 4 5 6 7 8 9 10 11 12 13 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：

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 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)