SQL query date into new columns with unique ID - sql

Question

I have the following columns, a 5 digit ID, date and a value. The ID repeats only when a new date is present.
ID Date Value
11111 2014-12-31 45
22222 2014-12-31 435
33333 2014-12-31 11
11111 2014-12-30 5
22222 2014-12-30 2245
33333 2014-12-30 86
11111 2014-12-29 43
22222 2014-12-29 4678
33333 2014-12-29 2494
I am trying to create an SQL query that will display the following (dates are column names):
ID 2014-12-31 2014-12-30 2014-12-29
11111 45 5 43
22222 435 2245 4678
33333 11 86 2494
What is the best way of doing this using MS SQL.
Thanks

Answer 1

As pointed out by the comments, you need to PIVOT your data. Here is one way using a Dynamic Crosstab.
Read this article by Jeff Moden for reference: http://www.sqlservercentral.com/articles/Crosstab/65048
CREATE TABLE temp(
ID INT,
[Date] DATE,
Value INT
)
INSERT INTO temp VALUES
(11111, '2014-12-31', 45),
(22222, '2014-12-31', 435),
(33333, '2014-12-31', 11),
(11111, '2014-12-30', 5),
(22222, '2014-12-30', 2245),
(33333, '2014-12-30', 86),
(11111, '2014-12-29', 43),
(22222, '2014-12-29', 4678),
(33333, '2014-12-29', 2494);
DECLARE #sql1 VARCHAR(2000) = ''
DECLARE #sql2 VARCHAR(2000) = ''
DECLARE #sql3 VARCHAR(2000) = ''
SELECT #sql1 =
'SELECT
ID
'
SELECT #sql2 = #sql2 +
' ,MIN(CASE WHEN [Date] = CAST(''' + CONVERT(VARCHAR(10), [Date], 120) + ''' AS Date) THEN Value END) AS ['
+ CONVERT(VARCHAR(10), [Date], 120) + ']'+ CHAR(10)
FROM(
SELECT DISTINCT [Date] FROM temp
)t
ORDER BY [Date] DESC
SELECT #sql3 =
'FROM temp
GROUP BY ID
ORDER BY ID'
PRINT (#sql1 + #sql2 + #sql3)
EXEC (#sql1 + #sql2 + #sql3)
DROP TABLE temp
EDIT:
If you want to use fixed name, you'll want to assign a number for each Date. This can be done using ROW_NUMBER():
SELECT #sql2 = #sql2 +
' ,MIN(CASE WHEN [Date] = CAST(''' + CONVERT(VARCHAR(10), [Date], 120) + ''' AS Date) THEN Value END) AS [Date' + CONVERT(VARCHAR, rn) + ']'+ CHAR(10)
FROM(
SELECT
[Date],
rn = ROW_NUMBER() OVER(ORDER BY [Date])
FROM (
SELECT DISTINCT [Date]FROM temp
)x
)t
ORDER BY [Date] DESC