我很抱歉提出这样一个问题,我确信已经多次回答了这个问题,但是我不太敢说出来去搜索它。甚至链接到类似问题也将不胜感激。
如果我有一个像这样的表:
+----+----------+-----+
|Name|Date |Score|
+----+----------+-----+
| Tom|2018-20-11| 100|
| Tom|2018-13-11| 95|
+----+----------+-----+
我将如何查询该信息,以便每一行都显示今天的分数列,一周前的分数等等?在此示例中,示例数据为一行,例如
+----+----------+-----------+
|Name|ScoreToday|Score-7Days|
+----+----------+-----------+
| Tom| 100| 95|
+----+----------+-----------+
我看到通过交叉申请购买解决了类似的问题,但无法解决。感谢您的帮助:)
一些示例代码:
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)
答案 0 :(得分:0)
我认为您正在寻找
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;
返回:
+------+---------------------+---------------------+---------------------+
| Name | Nov 13 2018 12:00AM | Nov 15 2018 12:00AM | Nov 20 2018 12:00AM |
+------+---------------------+---------------------+---------------------+
| Sami | 55 | 44 | |
| Tom | 95 | | 100 |
+------+---------------------+---------------------+---------------------+