Question

我运行了以下查询以在列＆＃34; name＆＃34;。

上添加唯一约束

alter table mytable 
  add unique (name)

现在我正在尝试删除此约束，我收到错误。

请给我一个解决方案。

由于

PS。我正在使用SQL Server

Answer 1

您可以使用

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>frau</groupId>
<artifactId>bgtweb</artifactId>
<packaging>jar</packaging>
<version>1.0.0-SNAPSHOT</version>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.0.RELEASE</version>
</parent>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <java.version>1.8</java.version>
    <derby.version>10.12.1.1</derby.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
    </dependency>

    <dependency>
        <groupId>commons-dbcp</groupId>
        <artifactId>commons-dbcp</artifactId>
        <version>${commons-dbcp.version}</version>
    </dependency>

    <dependency>
        <groupId>org.apache.derby</groupId>
        <artifactId>derbyclient</artifactId>
        <version>${derby.version}</version>
        <scope>runtime</scope>
    </dependency>

<!-- SPRING SECURITY -->
         <dependency>
                <groupId>org.springframework.security</groupId>
                <artifactId>spring-security-web</artifactId>
         </dependency>
         <dependency>
                <groupId>org.springframework.security</groupId>
                <artifactId>spring-security-config</artifactId>
         </dependency>
         <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-security</artifactId>
         </dependency>

         <!-- https://mvnrepository.com/artifact/org.springframework.security/spring-security-core -->
         <dependency>
                <groupId>org.springframework.security</groupId>
                <artifactId>spring-security-core</artifactId>
         </dependency>


</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>

        <plugin>
            <groupId>org.jheinzel.maven</groupId>
            <artifactId>derby-maven-plugin</artifactId>
            <version>1.0</version>
            <configuration>
                <derbyHome>${project.basedir}/data</derbyHome>
                <port>1527</port>
                <database>EMDb</database>
            </configuration>
        </plugin>

    </plugins>
</build>

</project>

删除列上的唯一约束

1 个答案: