SQL将值更改为大写或小写

如何在sql select语句中创建一个大写或小写的字段？

例:

从Person中选择firstname

如何使名字始终返回大写,同样总是返回小写？

SELECT UPPER(firstname) FROM Person

SELECT LOWER(firstname) FROM Person

分别为LCASE或UCASE.

例:

SELECT UCASE(MyColumn) AS Upper, LCASE(MyColumn) AS Lower
FROM MyTable

SQL SERVER 2005:

print upper('hello');
print lower('HELLO');