MySQL中的CONCAT函数使用教程

2020-01-18 22:54:32

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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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