Question

例如，有一个帐户表具有：

account_id | ......    
000        | ......    
001        | ......    
004        | ......    
010        | ......   
.....   
198        | ......

我想获取帐户ID的分布，而不是一次又一次地运行以下查询，有没有更聪明的方法来获取000-010、010-020，...，190-200的ID计数？谢谢

SELECT count(account_id)
FROM accounts
WHERE account_id >= '000' AND  account_id <= '010';

Answer 1

您将使用select (case when account_id >= '000' and account_id <= '010' then '000-010' when account_id >= '011' and account_id <= '020' then '011-020' when account_id >= '021' and account_id <= '030' then '021-030' . . . end) as account_id_grp, count(*) from accounts group by account_id_grp order by account_id_grp;：

 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:orientation="vertical">

    <TextView
        android:id="@+id/tv_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:paddingLeft="5dp"
        android:paddingStart="5dp"
        android:textColor="@color/blank"
        android:textSize="24sp"
        android:textStyle="bold" />    

    <TextView
        android:id="@+id/tv_subtitle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/tv_title"
        android:background="@color/white"
        android:paddingLeft="5dp"
        android:paddingStart="5dp"
        android:singleLine="false"
        android:textColor="@color/black"
        android:textStyle="italic" />

 </RelativeLayout>

Answer 2

您可以将account_id除以10以创建范围，然后按除结果进行分组以获得所需的结果：

SELECT CONCAT(LPAD(FLOOR(account_id/10)*10,3, '0'), '-', LPAD(FLOOR(account_id/10)*10+9, 3, '0')) AS `range`,
       COUNT(*) AS number
FROM accounts
GROUP BY `range`

输出（用于我的演示中的一些示例数据）：

range       number
000-009     3
010-019     2
020-029     1
030-039     1
040-049     1
050-059     2

Demo on dbfiddle

Answer 3

     select t1.account_id ||'-'||t2.
     account_id,count(*) from 
     table t1 where account_id IN (Select account_id from 
      table t2 where t2.account_id-t1.account_id=10)`

我试图通过相关子查询获取表中帐户ID的差异

如何递归运行sql查询？

3 个答案: