INTERVIEW QUESTIONS DATABASE MS SQL SERVER DETAILS

Question: Can Group Functions Be Used in the ORDER BY Clause in MS SQL Server?

Answer: If the query output is aggregated as groups, you can sort the groups by using group functions in the ORDER BY clause. The following statement returns the maximum "counts" in each group, determined by a unique combination of tag and year. The group output is sorted by the maximum "counts" in each group in ascending order:

SELECT tag, YEAR(created), MAX(counts)
FROM ggl_links GROUP BY tag, YEAR(created)
ORDER BY MAX(counts)
GO



tag year(created) max(counts)

DEV 2006 120

DBA 2006 390

DEV 2004 439

SQA 2007 728

SQA 2003 828

DBA 2005 960

DBA 2007 972

If the query output is aggregated as groups, you can sort the groups by using group functions in the ORDER BY clause. The following statement returns the maximum "counts" in each group, determined by a unique combination of tag and year. The group output is sorted by the maximum "counts" in each group in ascending order:

SELECT tag, YEAR(created), MAX(counts)
FROM ggl_links GROUP BY tag, YEAR(created)
ORDER BY MAX(counts)
GO



tag year(created) max(counts)

DEV 2006 120

DBA 2006 390

DEV 2004 439

SQA 2007 728

SQA 2003 828

DBA 2005 960

DBA 2007 972 Source: CoolInterview.com

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