SQL Server Backup and Restore - Simple Talk

Chapter 2: Planning, Storage and Documentation
ELSE 0
END), 0) AS [Average Differential
Backup Time] ,
SUM(CASE WHEN type = 'L'
THEN DATEDIFF(second, backup_start_date,
Backup_finish_date)
ELSE 0
END) / NULLIF(SUM(CASE WHEN type = 'L' THEN 1
ELSE 0
END), 0) AS [Average Log Backup Time] ,
SUM(CASE WHEN type = 'F'
THEN DATEDIFF(second, backup_start_date,
Backup_finish_date)
ELSE 0
END) / NULLIF(SUM(CASE WHEN type = 'F' THEN 1
ELSE 0
END), 0) AS [Average file/Filegroup
Backup Time] ,
SUM(CASE WHEN type = 'G'
THEN DATEDIFF(second, backup_start_date,
Backup_finish_date)
ELSE 0
END) / NULLIF(SUM(CASE WHEN type = 'G' THEN 1
ELSE 0
END), 0) AS [Average Differential
file Backup Time] ,
SUM(CASE WHEN type = 'P'
THEN DATEDIFF(second, backup_start_date,
Backup_finish_date)
ELSE 0
END) / NULLIF(SUM(CASE WHEN type = 'P' THEN 1
ELSE 0
END), 0) AS [Average partial Backup Time] ,
SUM(CASE WHEN type = 'Q'
THEN DATEDIFF(second, backup_start_date,
Backup_finish_date)
ELSE 0
END) / NULLIF(SUM(CASE WHEN type = 'Q' THEN 1
ELSE 0
END), 0) AS [Average Differential
partial Backup Time] ,
MAX(CASE WHEN type = 'D' THEN backup_size
ELSE 0
END) AS [Database Full Backup Size] ,
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