UPPER and LOWER are strings functions in SQL Server. Both function accepts character expression to be converted. UPPER converts all characters in the character expression to upper case and LOWER converts to lower case. If the character expression is not able to convert to varchar implicitly, an explicit conversion methods to be used.
Select UPPER('SQL Server'),lower('SQL Server')
See Also:
Change first character of table names with capital character including intermediate words using sp_rename
Generate Random characters in SQL Server
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