SELECT CASE ( ( ( CASE ( SIGN(CONVERT(VARCHAR(100),GETDATE() - DATEADD(year,DATEDIFF(year,birthday,GETDATE()),birthday),112)
- 19000101) )
WHEN 0 THEN DATEDIFF(year,GETDATE()) + 1
WHEN 1 THEN DATEDIFF(year,GETDATE()) + 1
WHEN -1 THEN DATEDIFF(year,GETDATE())
END ) - 1 ) / 5 + 1 )
WHEN 1 THEN '<20'
WHEN 2 THEN '<20'
WHEN 3 THEN '<20'
WHEN 4 THEN '<20'
WHEN 5 THEN '20~25'
WHEN 6 THEN '25~30'
WHEN 7 THEN '31~35'
WHEN 8 THEN '36~40'
WHEN 9 THEN '41~45'
WHEN 10 THEN '46~50'
WHEN 11 THEN '51~55'
WHEN 12 THEN '56~60'
ELSE '>=60'
END 'age distribution ',COUNT(*) 'total'
FROM dbo.person p
GROUP BY ( CASE ( ( ( CASE ( SIGN(CONVERT(VARCHAR(100),GETDATE()
- DATEADD(year,112) - 19000101) )
WHEN 0 THEN DATEDIFF(year,GETDATE()) + 1
WHEN 1 THEN DATEDIFF(year,GETDATE()) + 1
WHEN -1 THEN DATEDIFF(year,GETDATE())
END ) - 1 ) / 5 + 1 )
WHEN 1 THEN '<20'
WHEN 2 THEN '<20'
WHEN 3 THEN '<20'
WHEN 4 THEN '<20'
WHEN 5 THEN '20~25'
WHEN 6 THEN '25~30'
WHEN 7 THEN '31~35'
WHEN 8 THEN '36~40'
WHEN 9 THEN '41~45'
WHEN 10 THEN '46~50'
WHEN 11 THEN '51~55'
WHEN 12 THEN '56~60'
ELSE '>=60'
END )
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