Question

我的SQL代码有问题。当我尝试使用数据库DIGITECH时，SQL Server说数据库不存在。

这是我的代码

create database DIGITECH;
Go

use DIGITECH;

/*Erstellen der Tabellen*/
create table produkt(
    PID int identity(1,1) NOT NULL,
    Produktname nvarchar(50) NULL,
    Spezifikationen nvarchar(100) NULL,
    Beschreibung nvarchar(200) NULL,
    Preis int NOT NULL,
    FK_HeID int NULL,
    FK_KatID int NULL,
    FK_StID int NULL
);
go

create table hersteller(
    HeID int identity(1,1) NOT NULL,
    Hersteller nvarchar(50) NOT NULL
);
go

create table kategorie(
    KatID int identity(1,1) NOT NULL,
    KategorieName nvarchar(20) NULL
);
go

create table stat_us(
    StID int identity(1,1) NOT NULL,
    Status nvarchar(20) NOT NULL
);
go

create table verbindungstabelle_produkt_order(
    FK_OderID int NOT NULL,
    FK_PID int NOT NULL
);
go

create table or_der(
    OrderID int identity(1,1) NOT NULL,
    Status char NOT NULL,
    FK_Kunde int NULL
);

create table kunde(
    KID int identity NOT NULL,
    Name nvarchar(50) NULL,
    Vorname nvarchar(50) NULL,
    Email nvarchar(70) NULL,
    Geschlecht char NULL,
    FK_AdID int NULL
);
go

create table adresse(
    AdID int identity(1,1) NOT NULL,
    Strasse nvarchar(50) NULL,
    Hausnummer int NULL,
    FK_PLZ int NULL
);
go

create table plz(
    PLZ int identity(1,1) NOT NULL,
    Ort nvarchar(60) NOT NULL
);
go

/* Primärschlussel*/

alter table produkt
    add constraint PK_produkt
        primary key (PID);
go

alter table kategorie
    add constraint PK_kategorie
        primary key (KatID);
go

alter table stat_us
    add constraint PK_status
        primary key (StID);
go

alter table hersteller
    add constraint PK_hersteller
        primary key (HeID);
go

alter table or_der
    add constraint PK_order
        primary key (OrderID);
go

alter table kunde
    add constraint PK_kunde
        primary key (KID);
go

alter table adresse
    add constraint PK_adresse
        primary key (KID);
go

alter table plz
    add constraint PK_plz
        primary key (PLZ);
go

/* Fremdkeys hinzufügen */

alter table produkt
    add constraint FK_kategorie
        foreign key  (FK_KatID)
        references kategorie (KatID);
go

alter table produkt
    add constraint FK_status
        foreign key (FK_StID)
        references stat_us (StID);
go

alter table produkt
    add constraint FK_hersteller
        foreign key (FK_HeID)
        references hersteller (HeID);
go

alter table verbindungstabelle_produkt_order
    add constraint FK_PID
        foreign key (FK_PID)
        references produkt (PID);
go

alter table verbindungstabelle_produkt_order
    add constraint FK_OrderID
        foreign key (FK_OrderID)
        references ord_er (OrderID);
go

alter table ord_er
    add constraint FK_JID
        foreign key (FK_KID)
        references kunde (KID);
go

alter table kunde
    add constraint FK_AdID
        foreign key (FK_AdID)
        references adresse (AdID);
go

alter table adresse
    add constraint FK_PLZ
        foreign key (FK_PLZ)
        references plz (PLZ);
go

创建数据库和使用在一个文档中非常重要。

这是完整的代码

create database DIGITECH;
Go

use DIGITECH;

/*Erstellen der Tabellen*/
create table produkt(
    PID int identity(1,1) NOT NULL,
    Produktname nvarchar(50) NULL,
    Spezifikationen nvarchar(100) NULL,
    Beschreibung nvarchar(200) NULL,
    Preis int NOT NULL,
    FK_HeID int NULL,
    FK_KatID int NULL,
    FK_StID int NULL
);
go

create table hersteller(
    HeID int identity(1,1) NOT NULL,
    Hersteller nvarchar(50) NOT NULL
);
go

create table kategorie(
    KatID int identity(1,1) NOT NULL,
    KategorieName nvarchar(20) NULL
);
go

create table stat_us(
    StID int identity(1,1) NOT NULL,
    Status nvarchar(20) NOT NULL
);
go

create table verbindungstabelle_produkt_order(
    FK_OderID int NOT NULL,
    FK_PID int NOT NULL
);
go

create table or_der(
    OrderID int identity(1,1) NOT NULL,
    Status char NOT NULL,
    FK_Kunde int NULL
);

create table kunde(
    KID int identity NOT NULL,
    Name nvarchar(50) NULL,
    Vorname nvarchar(50) NULL,
    Email nvarchar(70) NULL,
    Geschlecht char NULL,
    FK_AdID int NULL
);
go

create table adresse(
    AdID int identity(1,1) NOT NULL,
    Strasse nvarchar(50) NULL,
    Hausnummer int NULL,
    FK_PLZ int NULL
);
go

create table plz(
    PLZ int identity(1,1) NOT NULL,
    Ort nvarchar(60) NOT NULL
);
go

/* Primärschlussel*/

alter table produkt
    add constraint PK_produkt
        primary key (PID);
go

alter table kategorie
    add constraint PK_kategorie
        primary key (KatID);
go

alter table stat_us
    add constraint PK_status
        primary key (StID);
go

alter table hersteller
    add constraint PK_hersteller
        primary key (HeID);
go

alter table or_der
    add constraint PK_order
        primary key (OrderID);
go

alter table kunde
    add constraint PK_kunde
        primary key (KID);
go

alter table adresse
    add constraint PK_adresse
        primary key (KID);
go

alter table plz
    add constraint PK_plz
        primary key (PLZ);
go

/* Fremdkeys hinzufügen */

alter table produkt
    add constraint FK_kategorie
        foreign key  (FK_KatID)
        references kategorie (KatID);
go

alter table produkt
    add constraint FK_status
        foreign key (FK_StID)
        references stat_us (StID);
go

alter table produkt
    add constraint FK_hersteller
        foreign key (FK_HeID)
        references hersteller (HeID);
go

alter table verbindungstabelle_produkt_order
    add constraint FK_PID
        foreign key (FK_PID)
        references produkt (PID);
go

alter table verbindungstabelle_produkt_order
    add constraint FK_OrderID
        foreign key (FK_OrderID)
        references ord_er (OrderID);
go

alter table ord_er
    add constraint FK_JID
        foreign key (FK_KID)
        references kunde (KID);
go

alter table kunde
    add constraint FK_AdID
        foreign key (FK_AdID)
        references adresse (AdID);
go

alter table adresse
    add constraint FK_PLZ
        foreign key (FK_PLZ)
        references plz (PLZ);
go

Screenshot 1

Answer 1

您需要在GO声明后加CREATE DATABASE。 GO命令通知SSMS将脚本分成不同的批次，在每个GO上拆分。由于您尝试选择数据库与创建数据库的批次相同，因此它会抛出一个错误，因为它在执行时尚不存在。

create database DIGITECH;
Go

use DIGITECH;

/*Erstellen der Tabellen*/
create table produkt(
    PID int identity(1,1) NOT NULL,
    Produktname nvarchar(50) NULL,
    Spezifikationen nvarchar(100) NULL,
    Beschreibung nvarchar(200) NULL,
    Preis int NOT NULL,
    FK_HeID int NULL,
    FK_KatID int NULL,
    FK_StID int NULL
);
go

编辑（问题中的新信息）

您的脚本有三个问题：

...
alter table adresse
    add constraint PK_adresse
        primary key (AdID);     -- This was changed from KID
go
...

您将PRIMARY KEY设置为KID，这不是表格中的列。

...
alter table verbindungstabelle_produkt_order
    add constraint FK_OrderID
        foreign key (FK_OderID) -- Changed from FK_OrderID
        references or_der (OrderID); -- Changed from ord_er
go
...

您在FOREIGN KEY上声明了FK_OrderID，这不是表格中的列。

您还尝试引用一个名为ord_er的表，该表不存在。

将这些更改为应该是什么让我们再犯一个错误：

alter table or_der 
    add constraint FK_JID
        foreign key (FK_Kunde) -- Changed from FK_KID
        references kunde (KID);
go

只需运行脚本并阅读错误消息即可轻松搞清楚......

完全正确的脚本

create database DIGITECH;
Go

use DIGITECH;

/*Erstellen der Tabellen*/
create table produkt(
    PID int identity(1,1) NOT NULL,
    Produktname nvarchar(50) NULL,
    Spezifikationen nvarchar(100) NULL,
    Beschreibung nvarchar(200) NULL,
    Preis int NOT NULL,
    FK_HeID int NULL,
    FK_KatID int NULL,
    FK_StID int NULL
);
go

create table hersteller(
    HeID int identity(1,1) NOT NULL,
    Hersteller nvarchar(50) NOT NULL
);
go

create table kategorie(
    KatID int identity(1,1) NOT NULL,
    KategorieName nvarchar(20) NULL
);
go

create table stat_us(
    StID int identity(1,1) NOT NULL,
    Status nvarchar(20) NOT NULL
);
go

create table verbindungstabelle_produkt_order(
    FK_OderID int NOT NULL,
    FK_PID int NOT NULL
);
go

create table or_der(
    OrderID int identity(1,1) NOT NULL,
    Status char NOT NULL,
    FK_Kunde int NULL
);

create table kunde(
    KID int identity NOT NULL,
    Name nvarchar(50) NULL,
    Vorname nvarchar(50) NULL,
    Email nvarchar(70) NULL,
    Geschlecht char NULL,
    FK_AdID int NULL
);
go

create table adresse(
    AdID int identity(1,1) NOT NULL,
    Strasse nvarchar(50) NULL,
    Hausnummer int NULL,
    FK_PLZ int NULL
);
go

create table plz(
    PLZ int identity(1,1) NOT NULL,
    Ort nvarchar(60) NOT NULL
);
go

/* Primärschlussel*/

alter table produkt
    add constraint PK_produkt
        primary key (PID);
go

alter table kategorie
    add constraint PK_kategorie
        primary key (KatID);
go

alter table stat_us
    add constraint PK_status
        primary key (StID);
go

alter table hersteller
    add constraint PK_hersteller
        primary key (HeID);
go

alter table or_der
    add constraint PK_order
        primary key (OrderID);
go

alter table kunde
    add constraint PK_kunde
        primary key (KID);
go

alter table adresse
    add constraint PK_adresse
        primary key (AdID);     -- This was changed from KID
go

alter table plz
    add constraint PK_plz
        primary key (PLZ);
go

/* Fremdkeys hinzufügen */

alter table produkt
    add constraint FK_kategorie
        foreign key  (FK_KatID)
        references kategorie (KatID);
go

alter table produkt
    add constraint FK_status
        foreign key (FK_StID)
        references stat_us (StID);
go

alter table produkt
    add constraint FK_hersteller
        foreign key (FK_HeID)
        references hersteller (HeID);
go

alter table verbindungstabelle_produkt_order
    add constraint FK_PID
        foreign key (FK_PID)
        references produkt (PID);
go

alter table verbindungstabelle_produkt_order
    add constraint FK_OrderID
        foreign key (FK_OderID) -- Changed from FK_OrderID
        references or_der (OrderID);
go

alter table or_der 
add constraint FK_JID
    foreign key (FK_Kunde) -- Changed from FK_KID
    references kunde (KID);
go

alter table kunde
    add constraint FK_AdID
        foreign key (FK_AdID)
        references adresse (AdID);
go

alter table adresse
    add constraint FK_PLZ
        foreign key (FK_PLZ)
        references plz (PLZ);
go

Answer 2

你得到了错误，因为你无法在同一批次中执行所有语句。你必须将它们分开.Go命令用于隔离批次。这是一些有趣的规则

创建默认值，创建函数，创建过程，创建规则，创建触发器和创建VIEW语句不能与批处理中的其他语句组合。

无法更改表格，然后在同一批次中引用新列。

因此，如果您执行上述任何操作，则必须将它们分隔为 GO

参考文献：
In SQL Server, when should you use GO and when should you use semi-colon ;?
https://technet.microsoft.com/en-us/library/aa172435%28SQL.80%29.aspx

Answer 3

请将您的“完整代码”添加到您的问题中（通过编辑选项）并删除您的答案，因为这不是答案......

您的代码中存在拼写错误和错误：

ord_er或or_der？
没有FK_OderID列（应该是FK_OrderID？）
您在列or_der上创建了FK_KID的FK，该列不存在...

???

请清理您的脚本，然后重试......

SQL Server无法理解USE＆lt; <database>＆gt;

3 个答案: