Select max() from count()

That just means MySQL insists that you give the inner SELECT a name, like:

SELECT MAX(counted) FROM
( SELECT COUNT(*) AS counted

FROM table_actions

WHERE status = "good"
GROUP BY user
) AS counts;

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Symbols Used in Excel Formula | The purpose of Symbols in Excel Formula

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How to change a MySQL database’s table prefix

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Symbols Used in Excel Formula | The purpose of Symbols in Excel Formula