Why Do I Get the \'Not Unique Table/Alias\' Error in My SQL Query?

Error: "Not Unique Table/Alias" in SQL Query

When executing SQL queries, it is crucial to ensure that referenced tables and columns are uniquely identified. The error "Not unique table/alias" indicates that the query attempts to access columns with the same name from multiple tables without specifying explicit table references or aliases.

In the provided query:

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