Why does Oracle 9i treat an empty string as NULL?

Why does Oracle 9i treat an empty string as NULL?

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Splitting string into multiple rows in Oracle

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Cleanest way to build an SQL string in Java

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null vs empty string in Oracle [duplicate]

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Finding last index of a string in Oracle

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Is there a function to split a string in PL/SQL?

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How to make use of SQL (Oracle) to count the size of a string?

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Oracle, adding leading zeros to string (not number)

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Oracle 'printf' equivalent

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Using MAX() in VARCHAR Field

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True length of a String, as seen by Oracle

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oracle 12c - select string after last occurrence of a character

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insert string which includes quotes in oracle

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how to convert csv to table in oracle

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Oracle SQL - How do I repeat a character based on a value in a column

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