SQLite选择混合列，我不能这样做

Question

我的代码是

mDB.query(DATABASE_TABLE, new String[] {KEY_ID, KEY_Name + KEY_Familyname + " as " + KEY_Fullname}, null, null, null, null, null);

所以这不是

Error: "KEY_Name + KEY_Familyname + " as " + KEY_Fullname" ????

Answer 1

使用||运算符连接字符串

select KEY_Name || KEY_Familyname as KEY_Fullname