问题
How do you make a field in a sql select statement all upper or lower case?
Example:
select firstname from Person
How do I make firstname always return upper case and likewise always return lower case?
回答1:
SELECT UPPER(firstname) FROM Person
SELECT LOWER(firstname) FROM Person
回答2:
LCASE or UCASE respectively.
Example:
SELECT UCASE(MyColumn) AS Upper, LCASE(MyColumn) AS Lower
FROM MyTable
回答3:
SQL SERVER 2005:
print upper('hello');
print lower('HELLO');
回答4:
You can use LOWER function and UPPER function. Like
SELECT LOWER('THIS IS TEST STRING')
Result:
this is test string
And
SELECT UPPER('this is test string')
result:
THIS IS TEST STRING
回答5:
You can do:
SELECT lower(FIRST NAME) ABC
FROM PERSON
NOTE: ABC is used if you want to change the name of the column
来源：https://stackoverflow.com/questions/341338/sql-changing-a-value-to-upper-or-lower-case