The SQL query uses the `COUNT(*)` function incorrectly, leading to an inaccurate count. The `COUNT(*)` function counts all rows in a group, even if they have `NULL` values in the specified columns. If ...
The solution modifies the SQL query to use `COUNT(column1), COUNT(column2), ...` instead of `COUNT(*)`. This ensures that only rows with non-NULL values in the specified columns are counted. For the ...
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