如何纠正“缺少右括号”的问题？

分类：编程问答

如何解决如何纠正“缺少右括号”的问题？

以下是我正在处理的查询示例：

CREATE TABLE book (
    book_id       NUMBER(6) NOT NULL CHECK(book_id > 0),isbn          VARCHAR2(20) NOT NULL UNIQUE,title         VARCHAR2(100) NOT NULL,shelf_letter  VARCHAR2(2) NOT NULL CHECK(shelf_letter IN('A-Z')),call_number   NUMBER(3) NOT NULL CHECK(call_number IN (1-999)),no_of_pages   NUMBER(4),no_of_copies  NUMBER(3) NOT NULL CHECK(no_of_copies >= 1),date_arrived  DATE NOT NULL DEFAULT SYSDATE,publisher_id  NUMBER(4) NOT NULL,cat_id        NUMBER(2) NOT NULL,CONSTRAINT shelf_call UNIQUE(shelf_letter,call_number) 
);

在编译时，它将引发“缺少右括号”错误。我检查了一下，但是所有的括号都占了。有人可以帮我吗？

解决方法

您看到的实际错误是由date_arrived列（其中NOT NULL的默认值位于SYSDATE之前的date_arrived DATE DEFAULT SYSDATE NOT NULL,引起的。 ：

shelf_letter  VARCHAR2(2) NOT NULL CHECK(shelf_letter IN('A-Z')),call_number   NUMBER(3) NOT NULL CHECK(call_number IN (1-999)),

此外，第二和第三个检查约束虽然在技术上是有效的语法，但看起来很可疑：

shelf_letter

对于REGEXP_LIKE的检查，大概是要强制执行它只能是A到Z的大写字母。如果是这样，请使用shelf_letter VARCHAR2(2) NOT NULL CHECK(REGEXP_LIKE(shelf_letter,'^[A-Z]$')),：

call_number

要检查call_number NUMBER(3) NOT NULL CHECK(call_number BETWEEN 1 AND 999),，请使用范围比较：

CREATE TABLE book (
    book_id       NUMBER(6) NOT NULL CHECK(book_id > 0),isbn          VARCHAR2(20) NOT NULL,title         VARCHAR2(100) NOT NULL,shelf_letter  VARCHAR2(2) NOT NULL CHECK(REGEXP_LIKE(shelf_letter,call_number   NUMBER(6) NOT NULL CHECK(call_number BETWEEN 1 AND 999),no_of_pages   NUMBER(4),no_of_copies  NUMBER(3) NOT NULL CHECK(no_of_copies >= 1),date_arrived  DATE DEFAULT SYSDATE NOT NULL,publisher_id  NUMBER(4) NOT NULL,cat_id        NUMBER(2) NOT NULL,CONSTRAINT shelf_call UNIQUE(shelf_letter,call_number)
);

将所有内容放在一起，使用以下create table语句：

2020-08-14 08:23:42.577 27533-27533/? E/FirebaseCrashlytics: The Crashlytics build ID is missing. This occurs when Crashlytics tooling is absent from your app's build configuration. Please review Crashlytics onboarding instructions and ensure you have a valid Crashlytics account.
2020-08-14 08:23:42.577 27533-27533/? E/FirebaseCrashlytics: .
2020-08-14 08:23:42.577 27533-27533/? E/FirebaseCrashlytics: .      /\
2020-08-14 08:23:42.577 27533-27533/? E/FirebaseCrashlytics: .     /  \
2020-08-14 08:23:42.577 27533-27533/? E/FirebaseCrashlytics: .    /    \
2020-08-14 08:23:42.577 27533-27533/? E/FirebaseCrashlytics: .   / |  | \
2020-08-14 08:23:42.577 27533-27533/? E/FirebaseCrashlytics: .     |  |
2020-08-14 08:23:42.577 27533-27533/? E/FirebaseCrashlytics: .     |  |
2020-08-14 08:23:42.577 27533-27533/? E/FirebaseCrashlytics: .
2020-08-14 08:23:42.580 27533-27533/? E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.ahlibank.ahlipay.subscriber.dev,PID: 27533
    java.lang.RuntimeException: Unable to get provider com.google.firebase.provider.FirebaseInitProvider: java.lang.IllegalStateException: The Crashlytics build ID is missing. This occurs when Crashlytics tooling is absent from your app's build configuration. Please review Crashlytics onboarding instructions and ensure you have a valid Crashlytics account.
        at android.app.ActivityThread.installProvider(ActivityThread.java:6396)
        at android.app.ActivityThread.installContentProviders(ActivityThread.java:5938)
        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5853)
        at android.app.ActivityThread.access$1100(ActivityThread.java:199)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1650)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6669)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
     Caused by: java.lang.IllegalStateException: The Crashlytics build ID is missing. This occurs when Crashlytics tooling is absent from your app's build configuration. Please review Crashlytics onboarding instructions and ensure you have a valid Crashlytics account.
        at com.google.firebase.crashlytics.internal.common.CrashlyticsCore.onPreExecute(CrashlyticsCore.java:122)
        at com.google.firebase.crashlytics.FirebaseCrashlytics.init(FirebaseCrashlytics.java:165)
        at com.google.firebase.crashlytics.CrashlyticsRegistrar.buildCrashlytics(CrashlyticsRegistrar.java:55)
        at com.google.firebase.crashlytics.CrashlyticsRegistrar.access$lambda$0(Unknown Source:0)
        at com.google.firebase.crashlytics.CrashlyticsRegistrar$$Lambda$1.create(Unknown Source:2)
        at com.google.firebase.components.ComponentRuntime.lambda$new$0(com.google.firebase:firebase-components@@16.0.0:69)
        at com.google.firebase.components.ComponentRuntime$$Lambda$1.get(Unknown Source:4)
        at com.google.firebase.components.Lazy.get(com.google.firebase:firebase-components@@16.0.0:53)
        at com.google.firebase.components.ComponentRuntime.initializeEagerComponents(com.google.firebase:firebase-components@@16.0.0:158)
        at com.google.firebase.FirebaseApp.initializeAllApis(com.google.firebase:firebase-common@@19.3.0:563)
        at com.google.firebase.FirebaseApp.initializeApp(com.google.firebase:firebase-common@@19.3.0:304)
        at com.google.firebase.FirebaseApp.initializeApp(com.google.firebase:firebase-common@@19.3.0:268)
        at com.google.firebase.FirebaseApp.initializeApp(com.google.firebase:firebase-common@@19.3.0:253)
        at com.google.firebase.provider.FirebaseInitProvider.onCreate(com.google.firebase:firebase-common@@19.3.0:51)
        at android.content.ContentProvider.attachInfo(ContentProvider.java:1917)
        at android.content.ContentProvider.attachInfo(ContentProvider.java:1892)
        at com.google.firebase.provider.FirebaseInitProvider.attachInfo(com.google.firebase:firebase-common@@19.3.0:45)
        at android.app.ActivityThread.installProvider(ActivityThread.java:6391)
        at android.app.ActivityThread.installContentProviders(ActivityThread.java:5938) 
        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5853) 
        at android.app.ActivityThread.access$1100(ActivityThread.java:199) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1650) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loop(Looper.java:193) 
        at android.app.ActivityThread.main(ActivityThread.java:6669) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) 

Demo

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