What's the difference between a 1048 and a 1054 error?

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Grade: Education Subject: Support
What's the difference between a 1048 and a 1054 error?
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Error 1048 ('Column doesn't exist') means you're referencing a column that doesn't exist in the table. Error 1054 ('Unknown column') means you're referencing a column that doesn't exist in the *expression* of the query (e.g., in a WHERE clause or SELECT list), but the table itself might exist. Both are related to column issues, but the specific context differs.