What does SQL error 1054 (42S22) 'Unknown column in 'field list'' mean?

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What does SQL error 1054 (42S22) 'Unknown column in 'field list'' mean?
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This error indicates that you're referencing a column in your SQL query (SELECT, UPDATE, DELETE, etc.) that doesn't exist in the specified table or that you've misspelled the column name. The '42S22' is the SQLSTATE code, a standard error code.