小编Dev*_*v X的帖子

例如:

pk_ref    fk
======    ===
1         a
1         b
1         c
2         a
2         b
2         d

如何进行"伪"查询之类的查询:

select distinc pk_ref
where fk in all('a', 'c');

返回查询结果必须匹配列表中外键的所有给定值.

结果应该是:

1

而以下选择不得返回任何记录.

select distinc pk_ref
where fk in all('a', 'c', 'd');

我怎么做？

当通过向导创建新项目并给出错误时,它会非常沮丧.

我只是使用MinSdk = 9创建新项目以使应用程序在姜饼上运行,这给了我以下错误:

Error:Execution failed for task ':app:processDebugManifest'.
> Manifest merger failed : uses-sdk:minSdkVersion 9 cannot be smaller than version 14 declared in library [com.android.support:appcompat-v7:26.0.0-alpha1] C:\Users\USER\.android\build-cache\dfb3187f39ea1ff94009f5d34353fff5cfc3daee\output\AndroidManifest.xml
    Suggestion: use tools:overrideLibrary="android.support.v7.appcompat" to force usage

这是gradle文件

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    buildToolsVersion "26.0.0"
    defaultConfig {
        applicationId "com.example.com.testApp"
        minSdkVersion 9
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude …