How can i do a conditional where clause in SQL, for missed back ups? - sql

Question

I have a pretty standard query for a back up aging report. What I want / need to do is have it report on missed back ups. I will need to see the last full database back up older than 2 days. I will also need to see any differential back ups older than the last day and any log back ups older than 30 mins. I'm not sure how to do the conditional where clause.
here's my basic query
SELECT
A.[Server],
A.database_name,
A.last_db_backup_date,
B.backup_type,
B.backup_start_date,
B.expiration_date,
B.backup_size,
B.logical_device_name,
B.physical_device_name,
B.backupset_name,
B.description
FROM
(
SELECT
CONVERT(CHAR(100), SERVERPROPERTY('Servername')) AS Server,
msdb.dbo.backupset.database_name,
MAX(msdb.dbo.backupset.backup_finish_date) AS last_db_backup_date
FROM msdb.dbo.backupmediafamily
INNER JOIN msdb.dbo.backupset ON msdb.dbo.backupmediafamily.media_set_id = msdb.dbo.backupset.media_set_id
GROUP BY
msdb.dbo.backupset.database_name
) AS A
LEFT JOIN
(
SELECT
CONVERT(CHAR(100), SERVERPROPERTY('Servername')) AS Server,
msdb.dbo.backupset.database_name,
msdb.dbo.backupset.backup_start_date,
msdb.dbo.backupset.backup_finish_date,
msdb.dbo.backupset.expiration_date,
msdb.dbo.backupset.backup_size,
msdb.dbo.backupmediafamily.logical_device_name,
msdb.dbo.backupmediafamily.physical_device_name,
msdb.dbo.backupset.name AS backupset_name,
msdb.dbo.backupset.description,
CASE msdb..backupset.type
WHEN 'D' THEN 'Full Database'
WHEN 'L' THEN 'Log'
WHEN 'I' THEN 'Differential'
WHEN 'F' THEN 'File Level'
WHEN 'G' THEN 'File Level Differential'
WHEN 'P' THEN 'Partial'
WHEN 'Q' THEN 'Differential partial'
END AS backup_type
FROM msdb.dbo.backupmediafamily
INNER JOIN msdb.dbo.backupset ON msdb.dbo.backupmediafamily.media_set_id = msdb.dbo.backupset.media_set_id
) AS B
ON A.[server] = B.[server] AND A.[database_name] = B.[database_name] AND A.[last_db_backup_date] = B.[backup_finish_date]
ORDER BY
A.database_name

Answer 1

Use a CASE statement. I'll paste an example from my own work:
SELECT
cplnt.complainant_type AS complainant_type,
cpt.date_received AS complaint_received,
CASE WHEN cpt.date_closed IS NULL
THEN (CURRENT_DATE - cpt.date_received)
ELSE (cpt.date_closed - cpt.date_received)
END AS complaint_age,
cpt.id AS complaint_id,
cs.date_case_received AS case_received,
cs.case_status AS case_stage,
stg.stage AS complaint_stage,
tm.name AS team,
trg.date_completed AS triage_date,
trg.method AS triage_method,
cpt.date_closed AS resolution_date,
cpt.status AS closure_type,
cpt.resolution_type AS resolution_type,
cpt.estimated_time_spent AS CLO_time_investment
FROM
complaints_complaint AS cpt
INNER JOIN
complaints_complainant AS cplnt
ON
cpt.complainant_id = cplnt.id
LEFT OUTER JOIN
complaints_case AS cs
ON
cpt.case_id = cs.id
INNER JOIN
complaints_stage AS stg
ON
cpt.stage_id = stg.id
INNER JOIN
community_team AS tm
ON
cpt.team_id = tm.id
LEFT OUTER JOIN
schemes_scheme AS sc
ON
cs.scheme_id = sc.id
LEFT OUTER JOIN
(SELECT
t1.*,
MIN(date_completed) OVER(PARTITION BY complaint_id) AS seq
FROM
complaints_triage AS t1) AS trg
ON
trg.complaint_id = cpt.id AND trg.date_completed = trg.seq;