Question

我想知道如何每6个月重置行级别号码。我总是希望保留第一个约会记录。然后计算6个月以获得我想要的下一个记录。我之间的任何记录都不需要。从第二个记录开始，计算6个月以上获得第三个记录。该过程只是循环，直到没有合格的记录。

以下是SQL和数据。

SQL

SELECT ID, DATE FROM MyTable ORDER BY ID, DATE

结果如下，

table, th, td {
    border: 1px solid black;
    border-collapse: collapse;
}

<h2>Table esult</h2>


<table style="width:40%">
  <tr>
    <th>ID</th>
    <th>DATE</th> 
  </tr>
  <tr>
    <td>123</td>
    <td>4/28/2016</td>
  </tr>
  <tr>
    <td>123</td>
    <td>5/27/2016</td>
  </tr>
  <tr>
    <td>123</td>
    <td>6/27/2016</td>
  </tr>
  <tr>
    <td>123</td>
    <td>7/21/2016</td>
  </tr>
  <tr>
    <td>123</td>
    <td>8/18/2016</td>
  </tr>
  <tr>
    <td>123</td>
    <td>9/22/2016</td>
  </tr>
  <tr>
    <td>123</td>
    <td>10/14/2016</td>
  </tr>
  <tr>
    <td>123</td>
    <td>11/18/2016</td>
  </tr>
  <tr>
    <td>123</td>
    <td>12/16/2016</td>
  </tr>
  <tr>
    <td>123</td>
    <td>1/20/2017</td>
  </tr>
  <tr>
    <td>123</td>
    <td>2/24/2017</td>
  </tr>
  <tr>
    <td>123</td>
    <td>3/24/2017</td>
  </tr>
  <tr>
    <td>123</td>
    <td>5/5/2017</td>
  </tr>
  <tr>
    <td>123</td>
    <td>6/26/2017</td>
  </tr>
  <tr>
    <td>123</td>
    <td>6/26/2017</td>
  </tr>
  <tr>
    <td>123</td>
    <td>6/27/2017</td>
  </tr>
  <tr>
    <td>123</td>
    <td>8/11/2017</td>
  </tr>
  <tr>
    <td>123</td>
    <td>9/8/2017</td>
  </tr>
  <tr>
    <td>123</td>
    <td>10/6/2017</td>
  </tr>
  <tr>
    <td>123</td>
    <td>10/6/2017</td>
  </tr>

</table>

我想要达到的结果如下，

table, th, td {
    border: 1px solid black;
    border-collapse: collapse;
}

.highl {
    background-color: coral
}

<h2>Table esult</h2>


<table style="width:40%">
  <tr>
    <th>ID</th>
    <th>DATE</th>
    <th>RANK</th>
  </tr>
  <tr class="highl">
    <td>123</td>
    <td>4/28/2016</td>
    <td>1</td>
  </tr>
  <tr>
    <td>123</td>
    <td>5/27/2016</td>
    <td>2</td>
  </tr>
  <tr>
    <td>123</td>
    <td>6/27/2016</td>
    <td>3</td>
  </tr>
  <tr>
    <td>123</td>
    <td>7/21/2016</td>
    <td>4</td>
  </tr>
  <tr>
    <td>123</td>
    <td>8/18/2016</td>
    <td>5</td>
  </tr>
  <tr>
    <td>123</td>
    <td>9/22/2016</td>
    <td>6</td>
  </tr>
  <tr>
    <td>123</td>
    <td>10/14/2016</td>
    <td>7</td>
  </tr>
  <tr class="highl">
    <td>123</td>
    <td>11/18/2016</td>
    <td>1</td>
  </tr>
  <tr>
    <td>123</td>
    <td>12/16/2016</td>
    <td>2</td>
  </tr>
  <tr>
    <td>123</td>
    <td>1/20/2017</td>
    <td>3</td>
  </tr>
  <tr>
    <td>123</td>
    <td>2/24/2017</td>
    <td>4</td>
  </tr>
  <tr>
    <td>123</td>
    <td>3/24/2017</td>
    <td>5</td>
  </tr>
  <tr>
    <td>123</td>
    <td>5/5/2017</td>
    <td>6</td>
  </tr>
  <tr class="highl">
    <td>123</td>
    <td>6/26/2017</td>
    <td>1</td>
  </tr>
  <tr>
    <td>123</td>
    <td>6/26/2017</td>
    <td>2</td>
  </tr>
  <tr>
    <td>123</td>
    <td>6/27/2017</td>
    <td>3</td>
  </tr>
  <tr>
    <td>123</td>
    <td>8/11/2017</td>
    <td>4</td>
  </tr>
  <tr>
    <td>123</td>
    <td>9/8/2017</td>
    <td>5</td>
  </tr>
  <tr>
    <td>123</td>
    <td>10/6/2017</td>
    <td>6</td>
  </tr>
  <tr>
    <td>123</td>
    <td>10/6/2017</td>
    <td>7</td>
  </tr>

</table>

感谢任何帮助。谢谢。

Answer 1

只需使用row_number()：

SELECT ID, DATE,
       ROW_NUMBER() OVER (PARTITION BY ID ORDER BY DATE) as rank
FROM MyTable
ORDER BY ID, DATE;

如果您想在每个时间段重置此信息，请在PARTITION BY中包含该信息：

SELECT ID, DATE,
       ROW_NUMBER() OVER (PARTITION BY ID,
                                       EXTRACT(YEAR FROM Date),
                                       (CASE WHEN EXTRACT(MONTH FROM Date) IN (1, 2, 3, 4, 5, 6) THEN 1 ELSE 2 END)
                          ORDER BY DATE
                         ) as rank
FROM MyTable
ORDER BY ID, DATE;

SQL - 每个时间段重置行级别编号

1 个答案: