Web Reference: This tutorial shows you how to use the Oracle UPPER () function to convert all letters of a string to uppercase. This Oracle tutorial explains how to use the Oracle / PLSQL UPPER function with syntax and examples. The Oracle / PLSQL UPPER function converts all letters in the specified string to uppercase. UPPER returns char, with all letters uppercase. char can be any of the data types CHAR, VARCHAR2, NCHAR, NVARCHAR2, CLOB, or NCLOB. The return value is the same data type as char.
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Oracle Upper Function - Latest Information & Updates 2026 Information & Biography

Oracle UPPER Function Information
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Last Updated: April 5, 2026

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