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UPPER
Converts all letters in the specified text string to uppercase.
Any characters that are not letters are unaffected by this function. Locale rules are applied if a locale is provided.
Use
UPPER(text,
[locale]) and replace text with the field
or expression you wish to convert to uppercase, and locale with the
optional two-character ISO language code or five-character locale code, if available.
UPPER("mycompany.com") returns
“MYCOMPANY.COM.”
UPPER("Mycompany.com 123") returns
“MYCOMPANY.COM 123.”
The Turkish language has two
versions of the letter i: one dotted and one dotless. The locale rules for Turkish require
the ability to capitalize the dotted i, and allow the dotless I to be lowercase. To
correctly use the UPPER() function with the Turkish
language locale, use the Turkish locale code tr in the
UPPER() function as follows:
UPPER(text, "tr")
Using this locale code ensures that Salesforce doesn’t transform any dotted i in the text to a dotless I.

