Question

我有下表作为查询结果说calc_success_rate

server,      service,     timestamp,     success_rate
123.23.23.2  ftp          1:00 am        1
123.23.23.2  http         1:00 am        0.5

我想将这些值插入到另一个表中，表示结构如下的指标

server       ftpSuccessRate     httpsuccessrate       timestamp  
123.23.23.2  1                  0.5                   1:00

我将在calc_success_rate.server和metrics.server以及calc_success_rate.timestamp和metrics.timestamp之间进行联接并插入ftpsuccessrate和httpsuccessrate

是否可以在一个查询中执行此操作

我需要一个像这样的更新声明

update secondTable st 
set ftpSuccessRate = , httpSuccessRate = 
from firstTable ft 
where ft.server = st.server and ft.timestamp = st.timestamp

Answer 1

INSERT INTO SecondTable
    (server, ftpSuccessRate, httpSuccessRate, timestamp)
    SELECT server, 
           MAX(CASE WHEN service = 'ftp' THEN success_rate ELSE NULL END),
           MAX(CASE WHEN service = 'http' THEN success_rate ELSE NULL END), 
           timestamp
         FROM FirstTable
         GROUP BY server, timestamp;

编辑：根据评论，这是更新版本：

UPDATE st 
    SET ftpSuccessRate = q.ftpSuccessRate,
        httpSuccessRate = q.httpSuccessRate
    FROM (SELECT server,  
                 MAX(CASE WHEN service = 'ftp' THEN success_rate ELSE NULL END) as ftpSuccessRate, 
                 MAX(CASE WHEN service = 'http' THEN success_rate ELSE NULL END) as httpSuccessRate,  
                 timestamp 
              FROM FirstTable 
              GROUP BY server, timestamp) q 
        INNER JOIN @SecondTable st 
            ON q.server = st.server 
                AND q.timestamp = st.timestamp

Answer 2

INSERT INTO
  youTable
SELECT
  server,
  MAX(CASE WHEN service = 'ftp'  THEN success_rate END)   AS  ftpSuccessRate,
  MAX(CASE WHEN service = 'http' THEN success_rate END)   AS httpSuccessRate,
  timestamp
FROM
  yourOtherTable
GROUP BY
  server,
  timestamp

或者作为现有记录的更新......

UPDATE
  yourOtherTable
SET
  ftpSuccessRate  = COALESCE(MAX(CASE WHEN service = 'ftp'  THEN success_rate END), yourOtherTable.ftpSuccessRate ),
  httpSuccessRate = COALESCE(MAX(CASE WHEN service = 'http' THEN success_rate END), yourOtherTable.httpSuccessRate)
FROM
  yourOtherTable
LEFT JOIN
  yourtable
    ON  yourTable.server    = yourOtherTable.server
    AND yourTable.timestamp = yourOtherTable.timestamp
GROUP BY
  yourOtherTable.server
  yourOtherTable.timestamp

Answer 3

 UPDATE 
  metrics SET 
      ftpSuccessRate = (CASE WHEN service = 'ftp' THEN success_rate ELSE NULL END),
      httpsuccessrate = (CASE WHEN service = 'http' THEN success_rate ELSE NULL END)    
  FROM 
    calc_success_rate 
  WHERE 
    metrics.server = calc_success_rate.Server

sql查询插入具有行值的列

3 个答案: