I would like to filter the result set on the variables that are listed in the CASE statements.
SELECT u.id,
max(t.request_at) AS "Date",
sum(CASE
WHEN t.view = 1 THEN 1
ELSE 0 END) AS ONE,
sum(CASE
WHEN t.view = 2 THEN 1
ELSE 0 END) AS TWO,
sum(CASE
WHEN t.view = 3 THEN 1
ELSE 0 END) AS THREE
FROM users u
JOIN t ON u.id = t.uid
WHERE u.signup_city_id = 18
AND u.creationtime BETWEEN '2013-12-01' AND '2014-01-01'
group by 1
I would really like to filter something along the lines of: WHERE ONE < 3
i.e. Where the column one is smaller than 3.
You would use a having clause:
SELECT u.id, max(t.request_at) AS "Date",
sum(CASE WHEN t.view = 1 THEN 1 ELSE 0 END) AS ONE,
sum(CASE WHEN t.view = 2 THEN 1 ELSE 0 END) AS TWO,
sum(CASE WHEN t.view = 3 THEN 1 ELSE 0 END) AS THREE
FROM users u JOIN
t
ON u.id = t.uid
WHERE u.signup_city_id = 18 AND u.creationtime BETWEEN '2013-12-01' AND '2014-01-01'
group by 1
HAVING sum(CASE WHEN t.view = 1 THEN 1 ELSE 0 END) < 3;
Or use a subquery:
SELECT t.*
FROM (SELECT u.id, max(t.request_at) AS "Date",
sum(CASE WHEN t.view = 1 THEN 1 ELSE 0 END) AS ONE,
sum(CASE WHEN t.view = 2 THEN 1 ELSE 0 END) AS TWO,
sum(CASE WHEN t.view = 3 THEN 1 ELSE 0 END) AS THREE
FROM users u JOIN
t
ON u.id = t.uid
WHERE u.signup_city_id = 18 AND u.creationtime BETWEEN '2013-12-01' AND '2014-01-01'
group by 1
) t
WHERE ONE < 3;
You need to wrap it into a derived table:
select *
from (
SELECT u.id,
max(t.request_at) AS "Date",
sum(CASE
WHEN t.view = 1 THEN 1
ELSE 0 END) AS ONE,
sum(CASE
WHEN t.view = 2 THEN 1
ELSE 0 END) AS TWO,
sum(CASE
WHEN t.view = 3 THEN 1
ELSE 0 END) AS THREE
FROM users u
JOIN t ON u.id = t.uid
WHERE u.signup_city_id = 18
AND u.creationtime BETWEEN '2013-12-01' AND '2014-01-01'
group by 1
) t
WHERE ONE < 3
You can use the result of the SUM of the CASE statement in your WHERE clause like this:
SELECT u.id,
max(t.request_at) AS "Date",
SUM(CASE
WHEN t.view = 1 THEN 1
ELSE 0 END) AS ONE,
SUM(CASE
WHEN t.view = 2 THEN 1
ELSE 0 END) AS TWO,
SUM(CASE
WHEN t.view = 3 THEN 1
ELSE 0 END) AS THREE
FROM users u
JOIN t ON u.id = t.uid
WHERE u.signup_city_id = 18
AND u.creationtime BETWEEN '2013-12-01' AND '2014-01-01'
GROUP BY 1
HAVING SUM(CASE
WHEN t.view = 1 THEN 1
ELSE 0 END) < 3
Related
This query pulls data from a VistaDB and produces info on the number of courses started in each month of the year from people in different countries.
Select c.CountryName As Country,
Count (case When Month( ch.CourseStarted ) = 1 Then 1 End) As Jan19,
Count (case when Month(ch.CourseStarted ) = 2 Then 1 End) as Feb19,
Count (case When Month(ch.CourseStarted ) = 3 Then 1 End) as Mar19,
Count (case When Month(ch.CourseStarted ) = 4 Then 1 End) as Apr19,
Count (case When Month(ch.CourseStarted ) = 5 Then 1 End) as May19,
Count (case When Month(ch.CourseStarted ) = 6 Then 1 End) as Jun19,
Count (case When Month(ch.CourseStarted ) = 7 Then 1 End) as Jul19,
Count (case When Month(ch.CourseStarted ) = 8 Then 1 End) as Aug19,
Count (case When Month(ch.CourseStarted ) = 9 Then 1 End) as Sep19,
Count (case When Month(ch.CourseStarted ) = 10 Then 1 End) as Oct19,
Count (case When Month(ch.CourseStarted ) = 11 Then 1 End)as Nov19,
Count (case When Month(ch.CourseStarted ) = 12 Then 1 End) as Dec19
From Country As c
Inner Join CourseHistory As ch On c.Oid = ch.Country
Where (ch.CourseStarted >= '2019-01-01' And
ch.CourseStarted <= '2019-12-31')
Group By c.CountryName
Order by c.CountryName;
My question is would it be possible to make this semi-dynamic so that if I were to make the final date in the where clause '2022-12-31' I could get a rafft of colums for each month of each year?
I need to count users that match certain conditions. To do that I need to join some tables and check if any of the grouping combination match the condition.
The way I implemented that now is by having a nested select that counts original matches and then counting the rows that have at least one result.
SELECT
COUNT(case when NestedCount1 > 0 then 1 else null end) as Count1,
COUNT(case when NestedCount2 > 0 then 1 else null end) as Count2,
COUNT(case when NestedCount3 > 0 then 1 else null end) as Count3
FROM
(SELECT
COUNT(case when Type = 1 then 1 else null end) as NestedCount1,
COUNT(case when Type = 2 then 1 else null end) as NestedCount2,
COUNT(case when Type = 2 AND Condition = 1 then 1 else null end) as NestedCount3
FROM [User]
LEFT JOIN [UserGroup] ON [User].Id = [UserGroup].UserId
LEFT JOIN [Group] ON [UserGroup].GroupId = [Group].Id
GROUP BY [User].Id) nested
What irks me is that the counts from the nested select are only used to check existence. However since ANY in SQL is only an operator I cannot think of a cleaner way on how to rewrite this.
The query returns correct results as is.
I'm wondering if there is any way to rewrite this that would avoid having intermediate results that are only used to check existence condition?
Sample imput User.csv Group.csv UserGroup.csv
Expected results: 483, 272, 121
It might be possible to simplify that query.
I think that the group on the UserId can be avoided.
By using distinct conditional counts on the user id.
Then there's no need for a sub-query.
SELECT
COUNT(DISTINCT case when [User].[Type] = 1 then [User].Id end) as Count1,
COUNT(DISTINCT case when [User].[Type] = 2 then [User].Id end) as Count2,
COUNT(DISTINCT case when [User].[Type] = 2 AND Condition = 1 then [User].Id end) as Count3
FROM [User]
LEFT JOIN [UserGroup] ON [UserGroup].UserId = [User].Id
LEFT JOIN [Group] ON [Group].Id = [UserGroup].GroupId;
SELECT
SUM(case when NestedCount1 > 0 then 1 else 0 end) as Count1,
SUM(case when NestedCount2 > 0 then 1 else 0 end) as Count2,
SUM(case when NestedCount3 > 0 then 1 else 0 end) as Count3
FROM
(
SELECT
[User].Id,
COUNT(case when Type = 1 then 1 else 0 end) as NestedCount1,
COUNT(case when Type = 2 then 1 else 0 end) as NestedCount2,
COUNT(case when Type = 2 AND Condition = 1 then 1 else 0 end) as NestedCount3
FROM [User]
LEFT JOIN [UserGroup] ON [UserGroup].UserId = [User].Id
LEFT JOIN [Group] ON [Group].Id = [UserGroup].GroupId
GROUP BY [User].Id
) nested
For some context, I am making an image browser which is connected to an SQLite database. Within the browser, similar images are grouped into an event (EventId) and each image (MicrosoftId) is labelled with a few tags (name).
I have these two queries on the same table (TagsMSCV) but pulling out different information. Ultimately I need to combine the information in my browser so if it was possible to combine these two queries (maybe with a JOIN?) it would be a lot faster and convenient for me. Both results of these queries share the EventId column.
1st Query ():
SELECT EventId as 'event', count(*) as 'size',
SUM(case when tag_count = 1 then 1 else 0 end) as '1',
SUM(case when tag_count = 2 then 1 else 0 end) as '2',
SUM(case when tag_count = 3 then 1 else 0 end) as '3'
FROM (SELECT EventId, MicrosoftId,
SUM(case when name in ('indoor', 'cluttered', 'screen') then 1 else 0 end) as tag_count
FROM TagsMSCV GROUP BY EventId, MicrosoftId) TagsMSCV
GROUP BY EventId ORDER BY 3 DESC, 2 DESC, 1 DESC
2nd Query
SELECT EventId,
SUM(CASE WHEN name = 'indoor' THEN 1 ELSE 0 END) as indoor,
SUM(CASE WHEN name = 'cluttered' THEN 1 ELSE 0 END) as cluttered,
SUM(CASE WHEN name = 'screen' THEN 1 ELSE 0 END) as screen
FROM TagsMSCV WHERE name IN ('indoor', 'cluttered', 'screen')
GROUP BY EventId
As you can see in both queries I am feeding in the tags 'necktie' 'man', 'male' and getting different information back.
SQL Fiddle Here: https://www.db-fiddle.com/f/f8WNimjmZAj1XXeCj4PHB8/3
You should do this all in one query:
SELECT EventId as event, count(*) as size,
SUM(case when (indoor + cluttered + screen) = 1 then 1 else 0 end) as tc_1,
SUM(case when (indoor + cluttered + screen) = 2 then 1 else 0 end) as tc_2,
SUM(case when (indoor + cluttered + screen) = 3 then 1 else 0 end) as tc_3,
SUM(indoor) as indoor,
SUM(cluttered) as cluttered,
SUM(screen) as screen
FROM (SELECT EventId, MicrosoftId,
SUM(CASE WHEN name = 'indoor' THEN 1 ELSE 0 END) as indoor,
SUM(CASE WHEN name = 'cluttered' THEN 1 ELSE 0 END) as cluttered,
SUM(CASE WHEN name = 'screen' THEN 1 ELSE 0 END) as screen
FROM TagsMSCV
GROUP BY EventId, MicrosoftId
) TagsMSCV
GROUP BY EventId
ORDER BY 3 DESC, 2 DESC, 1 DESC;
You need two aggregations to get the information about the tag counts. There is no need to add more aggregations and joins to the query.
You could use an Inner join subquery
SELECT TagsMSCV.EventId as 'event', count(*) as 'size',
SUM(case when tag_count = 1 then 1 else 0 end) as '1',
SUM(case when tag_count = 2 then 1 else 0 end) as '2',
SUM(case when tag_count = 3 then 1 else 0 end) as '3',
t.necktie,
t.man,
t.male
FROM (
SELECT EventId, MicrosoftId,
SUM(case when name in ('necktie' 'man', 'male') then 1 else 0 end) as tag_count
FROM TagsMSCV GROUP BY EventId, MicrosoftId
) TagsMSCV
INNER JOIN (
SELECT EventId,
SUM(CASE WHEN name = 'necktie' THEN 1 ELSE 0 END) as necktie,
SUM(CASE WHEN name = 'man' THEN 1 ELSE 0 END) as man,
SUM(CASE WHEN name = 'male' THEN 1 ELSE 0 END) as male
FROM TagsMSCV WHERE name IN ('necktie' 'man', 'male')
GROUP BY EventId
) t on t.EventId = TagsMSCV.EventId
GROUP BY TagsMSCV.EventId
ORDER BY 3 DESC, 2 DESC, 1 DESC
I have this query :
SELECT WorkId, RegisterDate, sum(RoomType1) As RoomType1, sum(RoomType2) As RoomType2, sum(RoomType3) As RoomType3, sum(RoomType4) As RoomType4, sum(RoomType5) As RoomType5, sum(RoomType6) As RoomType6, sum(RoomType7) As RoomType7, sum(RoomType8) As RoomType8
FROM (
SELECT dbo.[Work].WorkId, dbo.[Work].RegisterDate,
case dbo.Floor.RoomType when 1 then 1 else 0 end as RoomType1,
case dbo.Kat.RoomType when 2 then 1 else 0 end as RoomType2,
FROM dbo.Belediye INNER JOIN
dbo.[Is] ON dbo.Municipality.MunicipalityId= dbo.[Is].MunicipalityWorkId INNER JOIN
dbo.Look ON dbo.[Work].LookWorkId = dbo.Look.LookId ,
WHERE (dbo.Look.LocationIS NOT NULL)
) E
GROUP BY WorkId,
This query works as expected, but I can't understand why it has two selects, why does it need them? Please explain it to me. Thanks.
As you suspected this query dont need two selects and could be rewritten without sub-query:
SELECT i.IsId,
i.KayitTarihi,
SUM(case k.OdaTipi when 1 then 1 else 0 end) as RoomType1,
SUM(case k.OdaTipi when 2 then 1 else 0 end) as RoomType2,
SUM(case k.OdaTipi when 3 then 1 else 0 end) as RoomType3,
SUM(case k.OdaTipi when 4 then 1 else 0 end) as RoomType4,
SUM(case k.OdaTipi when 5 then 1 else 0 end) as RoomType5,
SUM(case k.OdaTipi when 6 then 1 else 0 end) as RoomType6,
SUM(case k.OdaTipi when 7 then 1 else 0 end) as RoomType7,
SUM(case k.OdaTipi when 8 then 1 else 0 end) as RoomType8
FROM dbo.Belediye b
INNER JOIN dbo.[Is] i
ON b.BelediyeId = i.BelediyeIsId
INNER JOIN dbo.YerGorme yg
ON i.YerGormeIsId = yg.YerGormeId
INNER JOIN dbo.Kat k
ON yg.YerGormeId = k.YerGorme_YerGormeId
WHERE yg.Lokasyon IS NOT NULL
GROUP BY i.IsId, i.KayitTarihi
Note: use table aliases
SELECT
userid,
CASE
WHEN (COUNT(CASE
WHEN onlinesportsgamewagers != 0
THEN 1
ELSE null
END)
+ COUNT(CASE
WHEN depositmade_amt != 0
THEN 1
ELSE null
END)) >= 10
THEN "VIP"
ELSE "NON-VIP"
END as VIPcheck
FROM
player_activity
WHERE
userid = 2023410
GROUP BY
year(txndate), month(txndate)
This query determines the user's VIP status for each month.
Ultimately, I want to have a query that determines if the user achieved VIP status for at least 3 months (including the current month). For the time being, it's only user 2023410, but eventually I want to run this for the whole database.
Therefore my ultimate output would be:
User - VIPcheck (3 different months w/ active status)
(one row per userID)
HAVING COUNT(CASE WHEN (COUNT(CASE WHEN onlinesportsgamewagers != 0
THEN 1
ELSE null
END)
+ COUNT(CASE WHEN depositmade_amt != 0
THEN 1
ELSE null
END)) >= 10
THEN 1
ELSE 0
END)
Tried the above having statement, but it didn't work. Any suggestions?
If I understand correctly, this gets the VIP status for one user by month:
SELECT userid, year(txndate), month(txndate),
(CASE WHEN SUM(CASE WHEN onlinesportsgamewagers <> 0 THEN 1 ELSE 0 END) +
SUM(CASE WHEN depositmade_amt <> 0 THEN 1 ELSE 0 END) >= 10
THEN 'VIP'
ELSE 'NON-VIP'
END) as VIPcheck
FROM player_activity
GROUP BY userid, year(txndate), month(txndate);
Another aggregation will get what you want:
SELECT userid,
(CASE WHEN SUM(VIPcheck = 'VIP') >= 3 THEN 'SUPER-VIP'
WHEN SUM(VIPcheck = 'VIP') >= 1 THEN 'VIP'
ELSE 'HOI POLLOI'
END) as status
FROM (SELECT userid, year(txndate), month(txndate),
(CASE WHEN SUM(CASE WHEN onlinesportsgamewagers <> 0 THEN 1 ELSE 0 END) +
SUM(CASE WHEN depositmade_amt <> 0 THEN 1 ELSE 0 END) >= 10
THEN 'VIP'
ELSE 'NON-VIP'
END) as VIPcheck
FROM player_activity
GROUP BY userid, year(txndate), month(txndate)
) uym
GROUP BY userid;