Show datediff as seconds, milliseconds

Question

I\'m trying to calculate the difference between two datetime values.

I tried datediff(s, begin,end) and datediff(ms, begin,end) however I w

Answer 1

SELECT 
  DATEDIFF(MILLISECOND, begin, end) / 1000, 
  DATEDIFF(MILLISECOND, begin, end) % 1000
FROM ...;

If you absolutely must form it as a string in your SQL query (can't your presentation tier do that?), then:

SELECT 
  CONVERT(VARCHAR(12),  DATEDIFF(MILLISECOND, begin, end) / 1000)
  + ',' 
  + RIGHT('000' + CONVERT(VARCHAR(4), DATEDIFF(MILLISECOND, begin, end) % 1000), 3)
FROM ...;

Also I really hope you have better column names than begin and end.