Question

我想知道在我的表定义中添加什么条件，以便在这些字段doctorId，dateApt，hourApt用于相同的日期和小时以及doctorId时不允许创建新行。

ex:  aptId  ClientId  doctorId  dateApt     TimeApt  IsAvaiable
     1      Null      1         2014/01/29  09:00    True
     2      Null      1         2014/01/29  09:00    True    <== not allowing this
     3      Null      1         2014/01/29  10:00    True    <== ok bc not same hour and date
     4      Null      2         2014/01/29  09:00    True    <== ok not same doctorId

这是表格定义。

CREATE TABLE [dbo].[Appointement] (
    [aptId]       INT      IDENTITY (1, 1) NOT NULL,
    [clientId]    INT      NULL,
    [doctorId]    INT      NOT NULL,
    [dateApt]     DATE     NOT NULL,
    [hourApt]     TIME (7) NOT NULL,
    [IsAvailable] BIT      NULL,
    PRIMARY KEY CLUSTERED ([rdvId] ASC),
    CONSTRAINT [fk_doctorID] FOREIGN KEY ([doctorId]) REFERENCES [dbo].[Doctor] ([Id]),
    CONSTRAINT [fk_clientID] FOREIGN KEY ([clientId]) REFERENCES [dbo].[User] ([Id_user])
);

由于

Answer 1

在这些列上添加唯一约束：

ALTER TABLE dbo.Appointement
  ADD CONSTRAINT uAppt UNIQUE (doctorId, dateApt, hourAp)

或者在创建表时添加它：

CREATE TABLE [dbo].[Appointement] (
     [aptId]       INT      IDENTITY (1, 1) NOT NULL,
     [clientId]    INT      NULL,
     [doctorId]   INT      NOT NULL,
     [dateApt]   DATE     NOT NULL,
     [hourApt]  TIME (7) NOT NULL,
     [IsAvailable] BIT      NULL,
     PRIMARY KEY CLUSTERED ([rdvId] ASC),
     CONSTRAINT [fk_doctorID] FOREIGN KEY ([doctorId]) REFERENCES [dbo].[Doctor] ([Id]),
     CONSTRAINT [fk_clientID] FOREIGN KEY ([clientId]) REFERENCES [dbo].[User] ([Id_user]),
     CONSTRAINT uAppt UNIQUE (doctorId, dateApt, hourAp)
 );

Answer 2

我添加了这一行 CONSTRAINT uniqueAPT UNIQUE（doctorId，dateApt，hourApt）

Answer 3

我认为你要找的是unique constraint。

CONSTRAINT [UQ_DoctorID_DateApt_HourApt] UNIQUE NONCLUSTERED
(
    [DoctorId], [DateApt], [HoursApt]
)
) ON [PRIMARY]

（这是CREATE TABLE语句的一部分的语法）

Answer 4

这是一个忽略重复约会的INSTEAD OF触发器：

在Appointement上创建触发器ignoreDups 而不是插入如声明@cId int 设置@cid =（从插入中选择clientId）声明@did int 设置@did =（从插入中选择doctorId）声明@dApt日期设置@dApt =（从插入中选择dateApt）宣布@hApt时间设置@hApt =（从插入中选择hourApt）声明@avail位设置@avail =（从插入中选择IsAvailable）

if（从Appointement中选择count（*）其中@dApt = dateApt和@hApt = hourApt和doctorid = @ did）= 0 插入Appointement（clientId，doctorid，dateApt，hourApt，IsAvailable）值（@ cid，@ did，@ dApt，@ hApt，@ avail）

这是sqlfidle

缺少表定义的SQL条件

4 个答案: