如何对Stack Exchange Data Explorer(SEDE)结果进行分页? [英] How to paginate Stack Exchange Data Explorer (SEDE) results?

问题描述

使用数据浏览器创建查询:

SELECT P.id, creationdate,tags,owneruserid,answercount
--SELECT DISTINCT TAGNAME ,TAGID
FROM TAGS  AS T
JOIN POSTTAGS AS PT
ON T.ID = PT.TAGID
JOIN POSTS AS P
ON PT.POSTID = P.ID
--WHERE CAST(P.TAGS AS VARCHAR) IN('JAVA')
WHERE PT.TAGID = 3143

如何在查询中添加分页以便不仅获取前50,000个结果，然后再次运行查询以获取下一个剩余结果?

How is it possible to add pagination in the query in order to take not only the first 50,000 results, but then run the query again to take the next remaining results?

推荐答案

有几种方法可以通过TSQL结果进行分页".看到:

There are a few ways to "page" through TSQL results; see:

• 如何从SQL返回结果页面?
  和
• SQL性能:WHERE与WHERE(ROW_NUMBER)

• How to return a page of results from SQL?
  and
• SQL performance: WHERE vs WHERE(ROW_NUMBER)

在这里，我将使用CTE方法:

Here I will use the CTE method as:

• 它使用方便的行号来翻页结果，而不是尝试跟踪诸如creationdate之类的难以预测的因素.
• 据报道，它的执行速度比OFFSET方法快.

• It uses convenient row numbers to page through results, rather than trying to track less predictable factors such as creationdate.
• It reportedly performs faster than the OFFSET method.

因此，该问题的查询变为此SEDE查询:

So, that question's query becomes this SEDE query:

-- StartRow: Starting row for paging
-- EndRow: Ending row for paging (Max 50K rows at a time)
WITH allData AS (
    SELECT
                ROW_NUMBER() OVER (ORDER BY P.creationdate) AS row
                , P.id
                , P.creationdate
                , P.tags
                , P.owneruserid
                , P.answercount
    FROM        Posttags    AS PT
    JOIN        Posts       AS P    ON PT.postid = P.id
    WHERE       PT.tagid    = 3143  -- tag [scala]
)
SELECT      *
FROM        allData
WHERE       row    >= ##StartRow:INT?1##
AND         row    <= ##EndRow:INT?50000##
ORDER BY    row

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