SQL查询来插入列从行

值我有以下表作为查询的结果说calc_success_rateSQL查询来插入列从行

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

我想插入这些值到另一个表说的指标，其结构如下

server  ftpSuccessRate  httpsuccessrate  timestamp 
123.23.23.2 1     0.5     1:00

我会做calc_success_rate.server和metrics.server和calc_success_rate.timestamp和metrics.timestamp之间的连接并插入ftpsuccessrate和httpsuccessrate

是否有可能做到这一点在一个查询

我需要一个更新语句是这样的

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

来源

2011-12-13 user373201

是否使用的是RDBMS？ –

我们使用Postgres 8.4 – user373201

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，这里的更新版本：

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

来源

2011-12-13 16:37:05

它更多的关于secondTable的更新声明，并使用服务器和时间戳在它们之间进行连接。更新secondTable st set ftpSuccessRate =，httpSuccessRate = from firstTable ft其中ft.server = st.server和ft.timestamp = st.timestamp – user373201

@ user373201：我将修改我的答案，但问题的主题明确指出“sql query to *插入*“ –

抱歉。我的错误和感谢您的帮助 – user373201

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

来源

2011-12-13 16:38:34 MatBailie

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

来源

2011-12-13 16:50:19

SQL查询来插入列从行

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