问题
I just wrote this query for a report. But I originally wrote it without the date range filter on every sub-query. But that didn't work. So I added it to each sub-query. And that worked, but I don't really like having to repeat it every time, is there syntax to do the same thing simpler?
SELECT Count(r.id) AS cnt_total,
(SELECT Count(r1.entity_id)
FROM auto_reminders_members r1
WHERE r1.reminder_id = r.reminder_id
AND r1.date_last_reminder BETWEEN CONVERT(DATETIME, '03/28/2013',
101)
AND
CONVERT(DATETIME,
'03/28/2013' + ' 23:59:59.997 ', 101)
AND r1.action = 'notnow') AS cnt_notnow,
(SELECT Count(r1.entity_id)
FROM auto_reminders_members r1
WHERE r1.reminder_id = r.reminder_id
AND r1.date_last_reminder BETWEEN CONVERT(DATETIME, '03/28/2013',
101)
AND
CONVERT(DATETIME,
'03/28/2013' + ' 23:59:59.997 ', 101)
AND r1.action = 'insert') AS cnt_insert,
(SELECT Count(r1.entity_id)
FROM auto_reminders_members r1
WHERE r1.reminder_id = r.reminder_id
AND r1.date_last_reminder BETWEEN CONVERT(DATETIME, '03/28/2013',
101)
AND
CONVERT(DATETIME,
'03/28/2013' + ' 23:59:59.997 ', 101)
AND r1.action = 'update') AS cnt_update,
(SELECT Count(r1.entity_id)
FROM auto_reminders_members r1
WHERE r1.reminder_id = r.reminder_id
AND r1.date_last_reminder BETWEEN CONVERT(DATETIME, '03/28/2013',
101)
AND
CONVERT(DATETIME,
'03/28/2013' + ' 23:59:59.997 ', 101)
AND r1.action = 'verify') AS cnt_verify
FROM auto_reminders_members r
WHERE r.reminder_id = 1
AND r.date_last_reminder BETWEEN CONVERT(DATETIME, '03/28/2013', 101) AND
CONVERT(DATETIME,
'03/28/2013' + ' 23:59:59.997 ', 101
)
GROUP BY r.reminder_id
回答1:
Here is a way to do that without all the sub-queries
SELECT Count(r.id) AS cnt_total,
sum(case when r.action = 'notnow' then 1 else 0 end) as 'cnt_notnow',
sum(case when r.action = 'insert' then 1 else 0 end) as 'cnt_insert',
sum(case when r.action = 'update' then 1 else 0 end) as 'cnt_update',
sum(case when r.action = 'verify' then 1 else 0 end) as 'cnt_verify'
FROM auto_reminders_members r
WHERE r.reminder_id = 1
AND CONVERT(DATE, r.date_last_reminder) = '20130328'
I also cleaned up the query a bit, removing the group by as this will always be 1, and changing the date comparison to avoid using the messy between logic (Thanks Aaron for the comment)
回答2:
Here is a way using GROUPING SETS and PIVOT, but this will hinge on the version you are using, which you forgot to tell us:
DECLARE @reminder_id INT, @date DATE;
SELECT @reminder_id = 1, @date = '20130328';
;WITH x AS
(
SELECT [action] = COALESCE([action],'Total'), c2 = COUNT(*)
FROM dbo.auto_reminders_members
WHERE reminder_id = @reminder_id
AND CONVERT(DATE, date_last_reminder) = @date
GROUP BY GROUPING SETS(([action]), ())
)
SELECT reminder_id = @reminder_id, * FROM x
PIVOT
(
MAX([c2]) FOR [action] IN ([Total],[notnow],[insert],[update],[verify])
) AS p;
If 2005, you can replace the GROUPING SETS line with the old-style syntax:
GROUP BY [action] WITH ROLLUP
I really wish people would stop condoning BETWEEN and this magic "end of day" stuff. If you want a full day your WHERE clause should either be:
WHERE CONVERT(DATE, r.date_last_reminder) = '20130328'
Or, if you are on 2005:
WHERE r.date_last_reminder >= '20130328'
AND r.date_last_reminder < '20130329'
Some important points here, mostly that 23:59:59.997 may round up or miss data depending on the underlying data type, that there is no reason you should ever be converting a datetime value to a string to perform a query, and that regional formats like m/d/y are bad for a variety of reasons (for example if your query was for 03/08/2013 I wouldn't know if you were after March 8th or August 3rd).
Please read these articles:
What do BETWEEN and the devil have in common?
Bad habits to kick : mis-handling date / range queries
You should also be careful about using reserved words / keywords for column names, like entity_id and action.
回答3:
You may be able to do something like this
SELECT Count(r.id) AS cnt_total,
SUM(CASE WHEN r1.action = 'notnow') THEN 1 ELSE 0 END) AS cnt_notnow,
SUM(CASE WHEN r1.action = 'insert') THEN 1 ELSE 0 END) AS cnt_insert,
SUM(CASE WHEN r1.action = 'update') THEN 1 ELSE 0 END) AS cnt_update,
SUM(CASE WHEN r1.action = 'verify') THEN 1 ELSE 0 END) AS cnt_verify,
FROM auto_reminders_members r
WHERE r.reminder_id = 1
AND r.date_last_reminder BETWEEN CONVERT(DATETIME, '03/28/2013', 101) AND
CONVERT(DATETIME,
'03/28/2013' + ' 23:59:59.997 ', 101
)
GROUP BY r.reminder_id
回答4:
Try this:
select
reminder_id,
count(1) as Total,
sum(case when r1.action = 'notnow' then 1 else 0 end) as cnt_notnow,
sum(case when r1.action = 'insert' then 1 else 0 end) as cnt_insert,
sum(case when r1.action = 'update' then 1 else 0 end) as cnt_update,
sum(case when r1.action = 'verify' then 1 else 0 end) as cnt_verify
from auto_reminders_members r
WHERE r.reminder_id = 1
AND r.date_last_reminder BETWEEN CONVERT(DATETIME, '03/28/2013', 101) AND
CONVERT(DATETIME,
'03/28/2013' + ' 23:59:59.997 ', 101
)
GROUP BY r.reminder_id
回答5:
Found one alternate solution:
SELECT Sum(1) AS cnt_total,
Sum(CASE
WHEN r.action = 'notnow' THEN 1
ELSE 0
END) AS cnt_notnow,
Sum(CASE
WHEN r.action = 'insert' THEN 1
ELSE 0
END) AS cnt_insert,
Sum(CASE
WHEN r.action = 'update' THEN 1
ELSE 0
END) AS cnt_update,
Sum(CASE
WHEN r.action = 'verify' THEN 1
ELSE 0
END) AS cnt_verify
FROM auto_reminders_members r WHERE r.reminder_id = 1 AND r.date_last_reminder BETWEEN CONVERT(DATETIME, '03/28/2013', 101) AND CONVERT(DATETIME, '03/28/2013' + ' 23:59:59.997 ', 101 )
回答6:
select convert(nvarchar(10),warnt.created_dt,120) 'Date',loc.loc_name 'Location',--
loctype.LocationTypeDesc,
(select SUM(stk.sel_price) from tbl_mst_stock as stk
inner join tbl_gen_warranty as wrn on stk.Stock_ID=wrn.Stock_Id
inner join tbl_mst_model as mdl on mdl.Model_ID=wrn.model_id
where wrn.mobile_type like 'SL')'Selleing Price',
(Select COUNT(stk.stk_code) from tbl_mst_stock as stk
inner join tbl_gen_warranty as warn on stk.Stock_ID=warn.Stock_Id
inner join tbl_mst_model mdl on mdl.Model_ID=warn.model_id
where warn.mobile_type like 'SL') 'Stock count'
From tbl_mst_location as loc
inner join tbl_mst_location_types loctype on loc.LocationTypeID=loctype.LocationTypeID
inner join tbl_gen_warranty as warnt on loc.Location_ID=warnt.Location_id
Where loctype.LocationTypeID=1 and loctype.group_id=1
and (CONVERT(nvarchar(10),warnt.created_dt,120)
Between CONVERT(nvarchar(10),'2013-01-01',120) and convert(nvarchar(10),'2013-07-09'))
Group by loc.loc_name,loctype.LocationTypeDesc,warnt.created_dt,loctype.LocationTypeID
来源：https://stackoverflow.com/questions/15689350/select-query-with-multiple-sub-queries-for-counts