在SQlite中使用SQL原始查询来联接表

Question

I have three tables(IncidentCategory, IncidentQuestion, IncidentOption) and in which I need to fire one join query to arrange and select some data. For same, some SQL Server developers have written one query like below:

SERVER QUERY

SELECT * FROM [IncidentQuestion] AS IQ WHERE IQ.[IncidentCategoryId]=27 AND  
IQ.[IsOption]=0 AND (SELECT COUNT(IO.[Id]) FROM [dbo]. [IncidentOption] AS 
IO WHERE IO.[IncidentQuestionId]=IQ.[Id])<>0 ORDER BY IQ.[OrderId] ASC;

DECLARE @False BIT; SET @False=0;SELECT IP.*,COALESCE(IV.[Id], 0) AS    
[IncidentValueId],COALESCE(IV.[IsChecked], @False) AS [IsChecked],IV.
[Value],IV.IncidentId FROM [IncidentOption] AS IP LEFT JOIN (SELECT * FROM 
[IncidentValue] WHERE [IncidentId]=0) AS IV ON IP.[Id]=IV.[IncidentOptionId] 
WHERE IP.[IncidentQuestionId]=68 ORDER BY IP.[OrderId] ASC;

In my app, I have created the tables with same column names as in server.

IncidentQuestion DbHelper:

private static final String INCIDENT_QUESTION_TABLE = "IncidentQuestionTable";
private static final String ID = "_id";
private static final String SERVER_ID = "Id";
private static final String CONTRACT_TYPE_ID = "ContractTypeId";
private static final String INCIDENT_CATAGORY_ID = "IncidentCategoryId";
private static final String QTEXT = "QText";
private static final String TYPE = "Type";  
private static final String ORDER_ID = "OrderId";
private static final String IS_MANDATORY = "IsMandatory";
private static final String IS_OPTION = "IsOption";

private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "IncidentQuestion";

private final Context context;
private SQLiteDatabase ourDatabase;
private DbHelper ourHelper;

public class DbHelper extends SQLiteOpenHelper {

    public DbHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);

    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        String locationQuery = "CREATE TABLE " + INCIDENT_QUESTION_TABLE + " ("
                + ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
                + SERVER_ID + " TEXT NOT NULL, " + CONTRACT_TYPE_ID
                + " TEXT NOT NULL, " + INCIDENT_CATAGORY_ID
                + " TEXT NOT NULL, " + QTEXT
                + " TEXT NOT NULL, " + TYPE
                + " TEXT NOT NULL, " + ORDER_ID
                + " TEXT NOT NULL, " + IS_MANDATORY
                + " TEXT NOT NULL, " + IS_OPTION + " TEXT NOT NULL);";

        db.execSQL(locationQuery);      

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS " + INCIDENT_QUESTION_TABLE);
        onCreate(db);

    }

}

IncidentOption DbHelper:

private static final String INCIDENT_OPTION_TABLE = "IncidentOptionTable";
private static final String ID = "_id";
private static final String SERVER_ID = "Id";
private static final String INCIDENT_QUESTION_ID = "IncidentQuestionId";
private static final String OPTION_TEXT = "OptionText";
private static final String ORDER_ID = "OrderId";
private static final String PARENT_ID = "ParentId";

private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "IncidentOption";

private final Context context;
private SQLiteDatabase ourDatabase;
private DbHelper ourHelper;

public class DbHelper extends SQLiteOpenHelper {

    public DbHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);

    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        String locationQuery = "CREATE TABLE " + INCIDENT_OPTION_TABLE + " ("
                + ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
                + SERVER_ID + " TEXT NOT NULL, "
                + INCIDENT_QUESTION_ID + " TEXT NOT NULL, " + OPTION_TEXT
                + " TEXT NOT NULL, " + ORDER_ID
                + " TEXT NOT NULL, " + PARENT_ID + " TEXT NOT NULL);";

        db.execSQL(locationQuery);      

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS " + INCIDENT_OPTION_TABLE);
        onCreate(db);

    }

}

All Select, Insert, Create, Delete query are working perfectly, I am unable to convert and fore the server query in my local db. Can please any one help me to find out the way that how I will write the server query in my local db OR how I will write some query which will work like the server query. Suggestions are mostly appreciable.

Answer 1

SQLite supports [brackets] for compatibility with SQL Server; you don't need to remove them.

SQLite has no DECLARE. In the query shown, False is the constant zero (which is also how SQLite handles boolean values); just drop the DECLARE and SET, and replace @False with 0 .