Question

我的数据：

$(document).ready(function(){
  $(".comments_link").click(function(e){
    e.preventDefault();
    $(".section").toggle();
  });                               
})

我需要选择DISCINCT并返回如下内容：

   USERNAME |  DATE
   ---------------------
   USER1   |   7-1-2016
   USER1   |   7-5-2016
   USER1   |   7-8-2016
   USER2   |   7-2-2016
   USER2   |   7-5-2016
   USER2   |   7-6-2016

所以，要帮助理解像这样的查询的需要。我想以更“类似日历”的格式输出任何给定周的列表，其中数据以更线性（每行一行）格式存储。

谢谢。

Answer 1

这称为$unsorted = json_decode(stripslashes($_POST['unsorted']));。以下是使用table pivoting的一个选项：

conditional aggregation

Answer 2

在转动之前，如果你不打算用一堆条件case语句，你将需要一个日期表，因为你想要包含NULL。 I.E.如果你有一个日期的BUNCH。我建议首先填充CTE并加入PIVOT。然后，您将使用动态SQL

--Staging table
IF OBJECT_ID ('tempdb..#HoldingTable') IS NOT NULL DROP TABLE #HoldingTable


--This is the date range you care about. You can set it to the MAX / MIN of your table if you want

DECLARE @DateFrom DATE
SET @DateFrom = '2016-07-01'

DECLARE @DateTo DATE
SET @DateTo = '2016-07-10'

;WITH DateRanges AS
(
    SELECT @DateFrom AS 'DateValue'
    UNION ALL
    SELECT DATEADD(DAY, 1, DateValue)
    FROM DateRanges
    WHERE DateValue < @DateTo
),


--This is just me populating your test data
Data as(
SELECT 'USER1' AS USERNAME, '7/1/2016' AS DATE
UNION ALL
SELECT 'USER1' AS USERNAME, '7/5/2016' AS DATE
UNION ALL
SELECT 'USER1' AS USERNAME, '7/8/2016' AS DATE
UNION ALL
SELECT 'USER2' AS USERNAME, '7/2/2016' AS DATE
UNION ALL
SELECT 'USER2' AS USERNAME, '7/5/2016' AS DATE
UNION ALL
SELECT 'USER2' AS USERNAME, '7/6/2016' AS DATE
)


--Bring everything together for the dynamic SQL
SELECT * 
INTO #HoldingTable
FROM DateRanges dt
LEFT JOIN Data d on d.DATE = dt.DateValue
OPTION (MAXRECURSION 1000)

--You'll see your data in vertical form here... we are about to pivot this
SELECT * FROM #HoldingTable

DECLARE @DynamicPivotQuery AS NVARCHAR(MAX)
DECLARE @ColumnName AS NVARCHAR(MAX)


--Here is your dynamic pivot based off your date range

--Get distinct values of the PIVOT Column 
SELECT @ColumnName= ISNULL(@ColumnName + ',','') 
       + QUOTENAME(DateValue)
FROM (SELECT DISTINCT DateValue FROM #HoldingTable) AS DateValue

--Prepare the PIVOT query using the dynamic 
SET @DynamicPivotQuery = 
  N'SELECT USERNAME, ' + @ColumnName + '
    FROM #HoldingTable
    PIVOT(MAX(Date) 
          FOR DateValue IN (' + @ColumnName + ')) AS PVTTable WHERE USERNAME IS NOT NULL'


--Execute the Dynamic Pivot Query
EXEC sp_executesql @DynamicPivotQuery

Answer 3

您可以像这样转动表格（SELECT [USERNAME], [7/1/2016], [7/2/2016], [7/3/2016], [7/4/2016], [7/5/2016],[7/6/2016],[7/7/2016],[7/8/2016] FROM [yourTable] AS SourceTable PIVOT ( MAX([DATE]) FOR [DATE] IN ([7/1/2016], [7/2/2016], [7/3/2016], [7/4/2016], [7/5/2016],[7/6/2016],[7/7/2016],[7/8/2016]) ) AS PivotTable;是原始数据表）：

$('#in').change(function() {
  $(this).val(parseFloat($(this).val()).toFixed(2));
})

Answer 4

您可以将STUFF与XML一起使用，如下所示：

 declare @calendar table(dates datetime)
 declare @i tinyint = 1
    while (@i<=8)
    begin 
        insert into @calendar
        select '7-'+cast(@i as char(1))+'-2016'
        set @i=@i+1
    end

   declare @test table (userid varchar(10), userDate datetime)
   insert into @test 
   select 'user1','7-1-2016'
   union
   select 'user1','7-5-2016'
   union 
   select 'user1','7-8-2016'
   union
   select 'user2','7-2-2016'
   union
   select 'user2','7-5-2016'
   union
   select 'user2','7-6-2016'

   ; with CTE as (
   select d.userid,dates,userDate
   from (select * from @calendar c cross apply (select distinct userid from @test) u) d
   left join @test t
   on d.dates=t.userDate
   and d.userid=t.userid
   --order by d.userid,t.userdate,d.dates
   )
    SELECT userId,
    STUFF((
    SELECT ','+
        case when userDate is null then 'null' else convert(varchar(20),userDate,101) end 
        AS [text()]
    FROM CTE CC
    WHERE CC.userid=C.userid
    FOR XML PATH('')),1,1,'') AS Dates
    FROM (
    select distinct userId
    FROM CTE 
    ) C

SQL：如何通过出现选择范围中的日期

4 个答案: