Question

I need to query a database which is designed so what a NVARCHAR column keeps age of clients. I want group clients using

GROUP BY age / 10  

but when engine encounters some string like ‘20.10.1984’ (someone entered his bithday instead of age), my query fails.

The percent of ‘bad’ ages is very small, so I want just to skip records which age isn’t convertible to INT.

Is there an easy way to do it?

Thanks!

Answer 1

Add a WHERE IsNumeric(age) = 1

Like this:

CREATE TABLE #temp (age NVARCHAR(20))  INSERT INTO #temp     SELECT '22'     UNION SELECT '24'     UNION SELECT '20.10.1984'     UNION SELECT '50'  SELECT age/10, COUNT(*)     FROM #temp     WHERE ISNUMERIC(age) = 1     GROUP BY age/10  DROP TABLE #temp