t sql derive column based on date of row












1















I apologise for asking a question I'm sure is answered many times over but I can't quite word it to search for it. Even a link to a similar problem would be much appreciated.



If I have a table like so:



+----+----------+-----+
|Name|Date |Score|
+----+----------+-----+
| Tom|2018-20-11| 100|
| Tom|2018-13-11| 95|
+----+----------+-----+


how would I query this so that each row would show a column for score today, score one week ago etc.? In this example with sample data it would be one row e.g.



+----+----------+-----------+
|Name|ScoreToday|Score-7Days|
+----+----------+-----------+
| Tom| 100| 95|
+----+----------+-----------+


I've seen similar problems solved via cross apply buy I can't work it out. Thanks for your help :)



Some sample code:



if exists (select * from sys.tables where name = 'test') drop table test
go
create table test (
Name varchar(128)
, AsAt datetime
, Score int
)

insert test values ('Tom', getdate(), 87)
, ('Tom', getdate() - 2, 100)
, ('Tom', getdate() - 7, 95)
, ('Tom', getdate() - 1, 81)
, ('Tom', getdate() - 30, 95)









share|improve this question




















  • 1





    How many dates can be there per Name in the input table?

    – Pawan Kumar
    Nov 20 '18 at 19:46











  • Are you wanting to combine and aggregate? Or do you just want to pivot rows into columns?

    – pmbAustin
    Nov 20 '18 at 19:48











  • Would it always be 7 days back from today? Or todays score and the score within the last 7 days or that?

    – Tim Mylott
    Nov 20 '18 at 19:53











  • This is called Pivot. Plenty of examples on stackoverflow.

    – Zohar Peled
    Nov 20 '18 at 20:11











  • Thanks for suggestions, there will be many dates, I want a few samples, I don't think I want to aggregate, just want a row taking certain dates as columns e.g. one week ago, one month ago, 3 months ago If it can be done in either pivot/unpivot/cross apply I'd like to see it in this example I would appreciate that. Thanks

    – beehive
    Nov 20 '18 at 20:59


















1















I apologise for asking a question I'm sure is answered many times over but I can't quite word it to search for it. Even a link to a similar problem would be much appreciated.



If I have a table like so:



+----+----------+-----+
|Name|Date |Score|
+----+----------+-----+
| Tom|2018-20-11| 100|
| Tom|2018-13-11| 95|
+----+----------+-----+


how would I query this so that each row would show a column for score today, score one week ago etc.? In this example with sample data it would be one row e.g.



+----+----------+-----------+
|Name|ScoreToday|Score-7Days|
+----+----------+-----------+
| Tom| 100| 95|
+----+----------+-----------+


I've seen similar problems solved via cross apply buy I can't work it out. Thanks for your help :)



Some sample code:



if exists (select * from sys.tables where name = 'test') drop table test
go
create table test (
Name varchar(128)
, AsAt datetime
, Score int
)

insert test values ('Tom', getdate(), 87)
, ('Tom', getdate() - 2, 100)
, ('Tom', getdate() - 7, 95)
, ('Tom', getdate() - 1, 81)
, ('Tom', getdate() - 30, 95)









share|improve this question




















  • 1





    How many dates can be there per Name in the input table?

    – Pawan Kumar
    Nov 20 '18 at 19:46











  • Are you wanting to combine and aggregate? Or do you just want to pivot rows into columns?

    – pmbAustin
    Nov 20 '18 at 19:48











  • Would it always be 7 days back from today? Or todays score and the score within the last 7 days or that?

    – Tim Mylott
    Nov 20 '18 at 19:53











  • This is called Pivot. Plenty of examples on stackoverflow.

    – Zohar Peled
    Nov 20 '18 at 20:11











  • Thanks for suggestions, there will be many dates, I want a few samples, I don't think I want to aggregate, just want a row taking certain dates as columns e.g. one week ago, one month ago, 3 months ago If it can be done in either pivot/unpivot/cross apply I'd like to see it in this example I would appreciate that. Thanks

    – beehive
    Nov 20 '18 at 20:59
















1












1








1








I apologise for asking a question I'm sure is answered many times over but I can't quite word it to search for it. Even a link to a similar problem would be much appreciated.



If I have a table like so:



+----+----------+-----+
|Name|Date |Score|
+----+----------+-----+
| Tom|2018-20-11| 100|
| Tom|2018-13-11| 95|
+----+----------+-----+


how would I query this so that each row would show a column for score today, score one week ago etc.? In this example with sample data it would be one row e.g.



+----+----------+-----------+
|Name|ScoreToday|Score-7Days|
+----+----------+-----------+
| Tom| 100| 95|
+----+----------+-----------+


I've seen similar problems solved via cross apply buy I can't work it out. Thanks for your help :)



Some sample code:



if exists (select * from sys.tables where name = 'test') drop table test
go
create table test (
Name varchar(128)
, AsAt datetime
, Score int
)

insert test values ('Tom', getdate(), 87)
, ('Tom', getdate() - 2, 100)
, ('Tom', getdate() - 7, 95)
, ('Tom', getdate() - 1, 81)
, ('Tom', getdate() - 30, 95)









share|improve this question
















I apologise for asking a question I'm sure is answered many times over but I can't quite word it to search for it. Even a link to a similar problem would be much appreciated.



If I have a table like so:



+----+----------+-----+
|Name|Date |Score|
+----+----------+-----+
| Tom|2018-20-11| 100|
| Tom|2018-13-11| 95|
+----+----------+-----+


how would I query this so that each row would show a column for score today, score one week ago etc.? In this example with sample data it would be one row e.g.



+----+----------+-----------+
|Name|ScoreToday|Score-7Days|
+----+----------+-----------+
| Tom| 100| 95|
+----+----------+-----------+


I've seen similar problems solved via cross apply buy I can't work it out. Thanks for your help :)



Some sample code:



if exists (select * from sys.tables where name = 'test') drop table test
go
create table test (
Name varchar(128)
, AsAt datetime
, Score int
)

insert test values ('Tom', getdate(), 87)
, ('Tom', getdate() - 2, 100)
, ('Tom', getdate() - 7, 95)
, ('Tom', getdate() - 1, 81)
, ('Tom', getdate() - 30, 95)






sql sql-server tsql pivot






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 20 '18 at 20:55







beehive

















asked Nov 20 '18 at 19:40









beehivebeehive

266




266








  • 1





    How many dates can be there per Name in the input table?

    – Pawan Kumar
    Nov 20 '18 at 19:46











  • Are you wanting to combine and aggregate? Or do you just want to pivot rows into columns?

    – pmbAustin
    Nov 20 '18 at 19:48











  • Would it always be 7 days back from today? Or todays score and the score within the last 7 days or that?

    – Tim Mylott
    Nov 20 '18 at 19:53











  • This is called Pivot. Plenty of examples on stackoverflow.

    – Zohar Peled
    Nov 20 '18 at 20:11











  • Thanks for suggestions, there will be many dates, I want a few samples, I don't think I want to aggregate, just want a row taking certain dates as columns e.g. one week ago, one month ago, 3 months ago If it can be done in either pivot/unpivot/cross apply I'd like to see it in this example I would appreciate that. Thanks

    – beehive
    Nov 20 '18 at 20:59
















  • 1





    How many dates can be there per Name in the input table?

    – Pawan Kumar
    Nov 20 '18 at 19:46











  • Are you wanting to combine and aggregate? Or do you just want to pivot rows into columns?

    – pmbAustin
    Nov 20 '18 at 19:48











  • Would it always be 7 days back from today? Or todays score and the score within the last 7 days or that?

    – Tim Mylott
    Nov 20 '18 at 19:53











  • This is called Pivot. Plenty of examples on stackoverflow.

    – Zohar Peled
    Nov 20 '18 at 20:11











  • Thanks for suggestions, there will be many dates, I want a few samples, I don't think I want to aggregate, just want a row taking certain dates as columns e.g. one week ago, one month ago, 3 months ago If it can be done in either pivot/unpivot/cross apply I'd like to see it in this example I would appreciate that. Thanks

    – beehive
    Nov 20 '18 at 20:59










1




1





How many dates can be there per Name in the input table?

– Pawan Kumar
Nov 20 '18 at 19:46





How many dates can be there per Name in the input table?

– Pawan Kumar
Nov 20 '18 at 19:46













Are you wanting to combine and aggregate? Or do you just want to pivot rows into columns?

– pmbAustin
Nov 20 '18 at 19:48





Are you wanting to combine and aggregate? Or do you just want to pivot rows into columns?

– pmbAustin
Nov 20 '18 at 19:48













Would it always be 7 days back from today? Or todays score and the score within the last 7 days or that?

– Tim Mylott
Nov 20 '18 at 19:53





Would it always be 7 days back from today? Or todays score and the score within the last 7 days or that?

– Tim Mylott
Nov 20 '18 at 19:53













This is called Pivot. Plenty of examples on stackoverflow.

– Zohar Peled
Nov 20 '18 at 20:11





This is called Pivot. Plenty of examples on stackoverflow.

– Zohar Peled
Nov 20 '18 at 20:11













Thanks for suggestions, there will be many dates, I want a few samples, I don't think I want to aggregate, just want a row taking certain dates as columns e.g. one week ago, one month ago, 3 months ago If it can be done in either pivot/unpivot/cross apply I'd like to see it in this example I would appreciate that. Thanks

– beehive
Nov 20 '18 at 20:59







Thanks for suggestions, there will be many dates, I want a few samples, I don't think I want to aggregate, just want a row taking certain dates as columns e.g. one week ago, one month ago, 3 months ago If it can be done in either pivot/unpivot/cross apply I'd like to see it in this example I would appreciate that. Thanks

– beehive
Nov 20 '18 at 20:59














1 Answer
1






active

oldest

votes


















0














I think you are looking for



CREATE TABLE T
([Name] varchar(4), [Date] datetime, [Score] int);

INSERT INTO T
([Name], [Date], [Score])
VALUES
('Tom', '2018-11-20 00:00:00', 100),
('Tom', '2018-11-13 00:00:00', 95),
('Sami', '2018-11-13 00:00:00', 55),
('Sami', '2018-11-15 00:00:00', 44);

DECLARE @Dates NVARCHAR(MAX) = '';
DECLARE @SQL NVARCHAR(MAX);
SELECT @Dates = @Dates + ',' + QUOTENAME([Date])
FROM T
GROUP BY [Date];

SET @Dates = STUFF(@Dates, 1, 1, '');

SET @SQL = N' SELECT * FROM(SELECT * FROM T) TT PIVOT( MAX(Score) FOR [Date] IN ('+ @Dates +')) PVT;';
EXECUTE sp_executesql @SQL;


Returns:



+------+---------------------+---------------------+---------------------+
| Name | Nov 13 2018 12:00AM | Nov 15 2018 12:00AM | Nov 20 2018 12:00AM |
+------+---------------------+---------------------+---------------------+
| Sami | 55 | 44 | |
| Tom | 95 | | 100 |
+------+---------------------+---------------------+---------------------+


Demo






share|improve this answer


























  • This is almost it, is the dynamic sql for picking up the dates? Because if it can be done without dynamic sql, I will always be picking a certain number of days previous to today. Thanks for your help

    – beehive
    Nov 20 '18 at 22:14











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1 Answer
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1 Answer
1






active

oldest

votes









active

oldest

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active

oldest

votes









0














I think you are looking for



CREATE TABLE T
([Name] varchar(4), [Date] datetime, [Score] int);

INSERT INTO T
([Name], [Date], [Score])
VALUES
('Tom', '2018-11-20 00:00:00', 100),
('Tom', '2018-11-13 00:00:00', 95),
('Sami', '2018-11-13 00:00:00', 55),
('Sami', '2018-11-15 00:00:00', 44);

DECLARE @Dates NVARCHAR(MAX) = '';
DECLARE @SQL NVARCHAR(MAX);
SELECT @Dates = @Dates + ',' + QUOTENAME([Date])
FROM T
GROUP BY [Date];

SET @Dates = STUFF(@Dates, 1, 1, '');

SET @SQL = N' SELECT * FROM(SELECT * FROM T) TT PIVOT( MAX(Score) FOR [Date] IN ('+ @Dates +')) PVT;';
EXECUTE sp_executesql @SQL;


Returns:



+------+---------------------+---------------------+---------------------+
| Name | Nov 13 2018 12:00AM | Nov 15 2018 12:00AM | Nov 20 2018 12:00AM |
+------+---------------------+---------------------+---------------------+
| Sami | 55 | 44 | |
| Tom | 95 | | 100 |
+------+---------------------+---------------------+---------------------+


Demo






share|improve this answer


























  • This is almost it, is the dynamic sql for picking up the dates? Because if it can be done without dynamic sql, I will always be picking a certain number of days previous to today. Thanks for your help

    – beehive
    Nov 20 '18 at 22:14
















0














I think you are looking for



CREATE TABLE T
([Name] varchar(4), [Date] datetime, [Score] int);

INSERT INTO T
([Name], [Date], [Score])
VALUES
('Tom', '2018-11-20 00:00:00', 100),
('Tom', '2018-11-13 00:00:00', 95),
('Sami', '2018-11-13 00:00:00', 55),
('Sami', '2018-11-15 00:00:00', 44);

DECLARE @Dates NVARCHAR(MAX) = '';
DECLARE @SQL NVARCHAR(MAX);
SELECT @Dates = @Dates + ',' + QUOTENAME([Date])
FROM T
GROUP BY [Date];

SET @Dates = STUFF(@Dates, 1, 1, '');

SET @SQL = N' SELECT * FROM(SELECT * FROM T) TT PIVOT( MAX(Score) FOR [Date] IN ('+ @Dates +')) PVT;';
EXECUTE sp_executesql @SQL;


Returns:



+------+---------------------+---------------------+---------------------+
| Name | Nov 13 2018 12:00AM | Nov 15 2018 12:00AM | Nov 20 2018 12:00AM |
+------+---------------------+---------------------+---------------------+
| Sami | 55 | 44 | |
| Tom | 95 | | 100 |
+------+---------------------+---------------------+---------------------+


Demo






share|improve this answer


























  • This is almost it, is the dynamic sql for picking up the dates? Because if it can be done without dynamic sql, I will always be picking a certain number of days previous to today. Thanks for your help

    – beehive
    Nov 20 '18 at 22:14














0












0








0







I think you are looking for



CREATE TABLE T
([Name] varchar(4), [Date] datetime, [Score] int);

INSERT INTO T
([Name], [Date], [Score])
VALUES
('Tom', '2018-11-20 00:00:00', 100),
('Tom', '2018-11-13 00:00:00', 95),
('Sami', '2018-11-13 00:00:00', 55),
('Sami', '2018-11-15 00:00:00', 44);

DECLARE @Dates NVARCHAR(MAX) = '';
DECLARE @SQL NVARCHAR(MAX);
SELECT @Dates = @Dates + ',' + QUOTENAME([Date])
FROM T
GROUP BY [Date];

SET @Dates = STUFF(@Dates, 1, 1, '');

SET @SQL = N' SELECT * FROM(SELECT * FROM T) TT PIVOT( MAX(Score) FOR [Date] IN ('+ @Dates +')) PVT;';
EXECUTE sp_executesql @SQL;


Returns:



+------+---------------------+---------------------+---------------------+
| Name | Nov 13 2018 12:00AM | Nov 15 2018 12:00AM | Nov 20 2018 12:00AM |
+------+---------------------+---------------------+---------------------+
| Sami | 55 | 44 | |
| Tom | 95 | | 100 |
+------+---------------------+---------------------+---------------------+


Demo






share|improve this answer















I think you are looking for



CREATE TABLE T
([Name] varchar(4), [Date] datetime, [Score] int);

INSERT INTO T
([Name], [Date], [Score])
VALUES
('Tom', '2018-11-20 00:00:00', 100),
('Tom', '2018-11-13 00:00:00', 95),
('Sami', '2018-11-13 00:00:00', 55),
('Sami', '2018-11-15 00:00:00', 44);

DECLARE @Dates NVARCHAR(MAX) = '';
DECLARE @SQL NVARCHAR(MAX);
SELECT @Dates = @Dates + ',' + QUOTENAME([Date])
FROM T
GROUP BY [Date];

SET @Dates = STUFF(@Dates, 1, 1, '');

SET @SQL = N' SELECT * FROM(SELECT * FROM T) TT PIVOT( MAX(Score) FOR [Date] IN ('+ @Dates +')) PVT;';
EXECUTE sp_executesql @SQL;


Returns:



+------+---------------------+---------------------+---------------------+
| Name | Nov 13 2018 12:00AM | Nov 15 2018 12:00AM | Nov 20 2018 12:00AM |
+------+---------------------+---------------------+---------------------+
| Sami | 55 | 44 | |
| Tom | 95 | | 100 |
+------+---------------------+---------------------+---------------------+


Demo







share|improve this answer














share|improve this answer



share|improve this answer








edited Nov 20 '18 at 21:10

























answered Nov 20 '18 at 21:00









SamiSami

8,99831242




8,99831242













  • This is almost it, is the dynamic sql for picking up the dates? Because if it can be done without dynamic sql, I will always be picking a certain number of days previous to today. Thanks for your help

    – beehive
    Nov 20 '18 at 22:14



















  • This is almost it, is the dynamic sql for picking up the dates? Because if it can be done without dynamic sql, I will always be picking a certain number of days previous to today. Thanks for your help

    – beehive
    Nov 20 '18 at 22:14

















This is almost it, is the dynamic sql for picking up the dates? Because if it can be done without dynamic sql, I will always be picking a certain number of days previous to today. Thanks for your help

– beehive
Nov 20 '18 at 22:14





This is almost it, is the dynamic sql for picking up the dates? Because if it can be done without dynamic sql, I will always be picking a certain number of days previous to today. Thanks for your help

– beehive
Nov 20 '18 at 22:14




















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