C# where子句中有多个列值

我需要显示每周的单用户时间表，如时间表

场景：一名教员在同一日期（2015年6月30日）在一周内被分配到多个批次（例如：BBA、数学和第1小时和第2小时的上午）和（MBA、数学、第3小时和第4小时的上午）。gridview的I行将存储为1行，2行存储为2行，依此类推

我的表格定义：

CREATE TABLE [dbo].[test] (
    [datedif]     NVARCHAR (50)  NOT NULL,
    [hour]         INT              NULL,
    [subject]    NVARCHAR (MAX) NULL,
    [faculty]    NVARCHAR (MAX) NULL,
    [attendence] BIT            NULL,
    [dayweek]     NVARCHAR (50)  NULL,
    [weekmonth]   NVARCHAR (MAX) NULL,
    [batch]       NVARCHAR (MAX) NULL,
    [section]     NVARCHAR (MAX) NULL,
    [session]     NVARCHAR (MAX) NULL
);

表如下所示：

Datefdiff | hour | subject | faulty| batch
----------+-------+----------+---------+-------+----------+--------+-------+----------+---------+-------
30-06-2015| 1| Maths    | Kevin   | BBA
30-06-2015| 2| Science  | Amal    | MBA
30-06-2015|3 | chemistry|Jaya     |BBA
30-06-2015|4 | chemistry|Jaya     |BBA 
30-06-2015|5 | chemistry|Jaya     |BBA
31-06-2015 |1| science  | Amal    |BBA
31-06-2015 |2| Maths    | kevin   |BBA 
31-06-2015 |3| Science  | Amal    |BBA 
31-06-2015 |4 | chemistry|Jaya     |BBA
31-06-2015 |5| science  | Amal    |BBA

仅为教员提供的预期输出：Amal

Datefdiff |hour|subject| batch |hour|subject | batch |faculty|hour | subject | batch | hour | subject | batch| hour | subject | batch | 
----------+-------+----------+-------+-------+----------+-------+-------+----------+
30-06-2015| 1    | Maths| BBA| 2| Science  | MBA   | 3| Science  |   BBA| 4| chemistry| BBA | 5 |Physics |MBA
31-06-2015| 1    | Maths| BBA| 2| Science  | MBA   | 3| Science  |   BBA| 4| chemistry| BBA | 5 |Physics |MBA

---

这可能是表格设计的起点：

declare @tbFaculty table (
      FacultyID int --identity(1,1) primary key
    , Name varchar(50)
)

insert into @tbFaculty ( FacultyID, Name )
values    ( 1, 'Kevin' )
        , ( 2, 'Amal' )

declare @tbBatch table(
      BatchID int --identity(1,1) primary key
    , Name char(3)
)

insert into @tbBatch ( BatchID, Name )
values    ( 1, 'BBA' )
        , ( 2, 'MBA' )

declare @tbClass table (
      [Hour] tinyint
    , [Subject] nvarchar (128)
    , [FacultyID] int
    , [Attendence] bit
    , [BatchID] char(3)
    , [ClassDate] date
)

insert into @tbClass ( [Hour], [Subject], FacultyID, Attendence, BatchID, ClassDate )
values    ( 1, 'Maths', 1, 1, 1, '2015-06-30' )
        , ( 2, 'Maths', 1, 1, 1, '2015-06-30' )
        , ( 3, 'Science', 2, 1, 1, '2015-06-30' )
        , ( 1, 'Science', 2, 1, 2, '2015-06-30' )
        , ( 2, 'Science', 2, 1, 2, '2015-06-30' )
        , ( 3, 'Maths', 1, 1, 2, '2015-06-30' )

select
    cl.ClassDate
    , cl.[Hour]
    , cl.[Subject]
    , ba.Name as BatchName
    , fa.Name as FacultyName
from
    @tbClass cl
    inner join @tbBatch ba on ba.BatchID = cl.BatchID
    inner join @tbFaculty fa on fa.FacultyID = cl.FacultyID
where
    fa.Name = 'Amal'

---

您还可以规范化主题。

以下是如何规范化数据，这将使查询变得更加简单

使用您的表定义，我插入了您的数据

INSERT INTO test(Datedif,hour1,subject1,faculty1,hour2,subject2,faculty2,hour3,subject3,faculty3,batch)
VALUES  ('30-06-2015',1,'Maths','Kevin',1,'Maths','Kevin',1,'Science','Amal','BBA'),
        ('30-06-2015',1,'Science','Amal',1,'Science','Amal',1,'Maths','Kevin','MBA');

然后，我为数据创建了一个新的规范化结构，其中包含更窄的数据类型。它有助于保持数据干净，并且不会浪费存储空间，这意味着查询将更快，因为它们不必处理太多数据

CREATE TABLE new_test
(
    dt          DATE            NULL,
    hr          TINYINT         NULL, --holds values between 0 to 255
    subj        VARCHAR(100)    NULL, --plenty big enough. No need for NVARCHAR unless you are using Unicode characters
    faculty     VARCHAR(100)    NULL,
    attendance  BIT             NULL,
    dayweek     TINYINT         NULL,
    weekmonth   TINYINT         NULL,
    section     VARCHAR(100)    NULL, --not sure what this is
    sess        VARCHAR(100)    NULL, --not sure what this is
    batch       CHAR(3)         NULL  --looks like there are three character codes
);

这就是我规范化数据的地方。我不确定你是否有出席2、3、4等。。。如果您在实际表中这样做，那么您应该修复我的代码

注意：我计算了从日期开始的一周和一周。我做了我最好的猜测，如果他们是不正确的，那么请随意调整他们

WITH norm_data
AS
(
SELECT datedif,hour1,subject1,faculty1,attendence1,dayweek,weekmonth,section,[session],batch FROM test
UNION ALL
SELECT datedif,hour2,subject2,faculty2,attendence1,dayweek,weekmonth,section,[session],batch FROM test
UNION ALL
SELECT datedif,hour3,subject3,faculty3,attendence1,dayweek,weekmonth,section,[session],batch FROM test
UNION ALL
SELECT datedif,hour4,subject4,faculty4,attendence1,dayweek,weekmonth,section,[session],batch FROM test
UNION ALL
SELECT datedif,hour5,subject5,faculty5,attendence1,dayweek,weekmonth,section,[session],batch FROM test
)

INSERT INTO new_test
SELECT  PARSE(datedif AS DATE USING 'de-DE') AS [datedif],
        hour1,
        subject1,
        faculty1,
        attendence1,
        DATEPART(WEEKDAY,PARSE(datedif AS DATE USING 'de-DE')) AS dayweek,
        datepart(day, datediff(day, 0, PARSE(datedif AS DATE USING 'de-DE'))/7 * 7)/7 + 1 AS weekmonth,
        section,
        [session],
        batch
FROM norm_data

现在让我们看看你的新桌子

SELECT *
FROM new_test

如果正确，那么下面是如何重命名表

EXEC SP_rename  @objname = 'test', --if you don't want to drop the old table
                @newname = 'test_old'

EXEC SP_rename  @objname = 'new_test', --now give the new table the actual name
                @newname = 'test'


SELECT *
FROM test

---

我只想补充一下，这是一个单独的答案。试试这个：

--INSERT INTO dbo.test(datedif,[hour],[subject],faculty,batch)
--VALUES
--('30-06-2015',1,'Maths','Kevin','BBA'),
--('30-06-2015',2,'Science','Amal','MBA'),
--('30-06-2015',3,'chemistry','Jaya','BBA'),
--('30-06-2015',4,'chemistry','Jaya','BBA'),
--('30-06-2015',5,'chemistry','Jaya','BBA'),
--('31-06-2015',1,'science','Amal','BBA'),
--('31-06-2015',2,'Maths','kevin','BBA'),
--('31-06-2015',3,'Science','Amal','BBA'),
--('31-06-2015',4,'chemistry','Jaya','BBA'),
--('31-06-2015',5,'science','Amal','BBA');

WITH CTE_Hours
AS
(
    SELECT
            1 AS hour1,
            MAX(CASE WHEN [Hour] = 1 THEN [subject] END)    AS subject1,
            MAX(CASE WHEN [Hour] = 1 THEN [batch] END)      AS batch1 ,

            2 AS hour2,
            MAX(CASE WHEN [Hour] = 2 THEN [subject] END)    AS subject2,
            MAX(CASE WHEN [Hour] = 2 THEN [batch] END)      AS batch2

            --etc...
    FROM dbo.test
    WHERE faculty = 'Amal'
)

SELECT *
FROM    (
            SELECT DISTINCT datedif
            FROM dbo.test
        ) A
CROSS JOIN CTE_Hours

---

那是个糟糕的桌子设计。您不应该为了模拟某些显示/表单而存储数据。应取消填充数据，以便所有数据（如

主题

数据）都在同一列中结束。然后添加一个可以存储数字1-5的额外列，并为该列指定一个名称，解释该数据所代表的内容（您当前错误地嵌入到表元数据中的数据）。谢谢您的建议，但如果我可以通过在where子句中使用该列来显示教员计划的详细信息，则会有所帮助，同时，我将尝试按照您的建议更改表定义。在更改表定义时，请记住日期值应存储在日期数据类型中，而nvarchar（max）用于超长unicode字符串。因为您的字符串看起来既短又简单，所以可以使用varchar（50）或任何其他适合您需要的长度。另外，我建议你规范化你的数据-有一个主题表，一个批次表，一个错误表等等。Nvarchar（max）-坏主意！！！您的表未正常化。修复你的数据库设计。我已根据你的建议更改了我的表。你可以在上面看到我更改的表。我如何加入它们并在网格视图中显示。请给我一些建议。像wise一样查看上面的网格视图我应该得到输出