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What group function can be used to perform a count that includes NULL values?
Wiki User
∙ 13y ago
You can not group a NULL value natively. You can however transform the NULL into so other unique value; dynamically, without writing this value to the database; and group by this.
You would accomplish this by implementing a coalesce T-SQL expression
For example lets say the MiddleName field is NULL in many cases and you want to to group by these.. You might want to turn this NULL into say an * for purposes of giving a value that you can group by.
Now you can group by all MiddleName entries and also use a where clause to excluded those values <> * giving you a sub grouping of those records ONLY having null.
The SQL command would look something like this:
SELECT coalesce(MiddleName, '*')
FROM YourTableNameHere
WHERE MiddleName LIKE '*'
GROUP BY MiddleName
The coalesce returns the first NON NULL value in the chain(you can have more than two values).
In the above example you will get the MiddleName if there is one and an * if the database value is NULL.
This is a SELECT so there is NO update to the database.
Wiki User
∙ 13y ago
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The COUNT function.
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