MySQL中SELECT命令大家都经常在用，下面为您介绍的是MySQL中SELECT命令的几种特殊用法，供您参考学习之用。
MySQL中SELECT命令类似于其他编程语言里的print或者write，你可以用它来显示一个字符串、数字、数学表达式的结果等等。如何使用MySQL中SELECT命令的特殊功能？
1.显示MYSQL的版本
mysql> select version(); +-----------------------+ | version() | +-----------------------+ | 6.0.4-alpha-community | +-----------------------+ 1 row in set (0.02 sec)
2. 显示当前时间
mysql> select now(); +---------------------+ | now() | +---------------------+ | 2009-09-15 22:35:32 | +---------------------+ 1 row in set (0.04 sec)
3. 显示年月日
SELECT DAYOFMONTH(CURRENT_DATE); +--------------------------+ | DAYOFMONTH(CURRENT_DATE) | +--------------------------+ | 15 | +--------------------------+ 1 row in set (0.01 sec) SELECT MONTH(CURRENT_DATE); +---------------------+ | MONTH(CURRENT_DATE) | +---------------------+ | 9 | +---------------------+ 1 row in set (0.00 sec) SELECT YEAR(CURRENT_DATE); +--------------------+ | YEAR(CURRENT_DATE) | +--------------------+ | 2009 | +--------------------+ 1 row in set (0.00 sec)
4. 显示字符串
mysql> SELECT "welecome to my blog!"; +----------------------+ | welecome to my blog! | +----------------------+ | welecome to my blog! | +----------------------+ 1 row in set (0.00 sec)
5. 当计算器用
select ((4 * 4) / 10 ) + 25; +----------------------+ | ((4 * 4) / 10 ) + 25 | +----------------------+ | 26.60 | +----------------------+ 1 row in set (0.00 sec)
6. 串接字符串
select CONCAT(f_name, " ", l_name) AS Name from employee_data where title = 'Marketing Executive'; +---------------+ | Name | +---------------+ | Monica Sehgal | | Hal Simlai | | Joseph Irvine | +---------------+ 3 rows in set (0.00 sec)
注意：这里用到CONCAT()函数，用来把字符串串接起来。另外，我们还用到以前学到的AS给结果列'CONCAT(f_name, " ", l_name)'起了个假名。