MySQL加入和刪除只發生第一次發生

Question

我必須從MySQL表中刪除40 mln行。

我必須找到與輸出的所有行 - >「靜態輸出」 然後刪除上面的輸出行和刪除其上面的輸出和比其他產值「的同一臺主機 和服務的下一行STATIC OUTPUT「。

的樣本數據：

列- > ID，主機，服務，輸出

1,"127.0.0.1","service1","STATIC OUTPUT" 
2,"127.0.0.2","service5","RANDOM OUTPUT X0" 
3,"127.0.0.2","service5","STATIC OUTPUT" 
4,"127.0.0.3","service1","RANDOM OUTPUT X1" 
5,"127.0.0.3","service10","RANDOM OUTPUT X2" 
6,"127.0.0.2","service5","RANDOM OUTPUT X3" 
7,"127.0.0.1","service2","RANDOM OUTPUT X4" 
8,"127.0.0.1","service1","RANDOM OUTPUT X5" 
9,"127.0.0.2","service4","RANDOM OUTPUT X6" 
10,"127.0.0.3","service10","RANDOM OUTPUT X7" 
11,"127.0.0.1","service1","RANDOM OUTPUT X7" 
12,"127.0.0.1","service1","RANDOM OUTPUT X8" 
13,"127.0.0.1","service1","RANDOM OUTPUT X9" 
14,"127.0.0.2","service5","RANDOM OUTPUT X10" 
15,"127.0.0.1","service1","STATIC OUTPUT" 
16,"127.0.0.1","service1","RANDOM OUTPUT X11" 
17,"127.0.0.1","service1","RANDOM OUTPUT X12"  
... 

例子：當我們發現

1,"127.0.0.1","service1","STATIC OUTPUT" 

我們應該刪除ID爲值的行1和8，

8,"127.0.0.1","service1","RANDOM OUTPUT X5" 

當我們發現

3,"127.0.0.2","service5","STATIC OUTPUT" 

我們應該刪除與ID值3和6行，

6,"127.0.0.2","service5","RANDOM OUTPUT X3" 

我寫了這樣的事情（選擇，因爲測試查詢的DELETE語句的這一翻譯），

SELECT * FROM data r1 INNER JOIN (SELECT id, host, service 
FROM data 
WHERE output = 'STATIC OUTPUT') r2 ON 
     r1.id>r2.id AND r1.service=r2.service 
     AND r1.host=r2.host 
     AND r1.output<>'STATIC OUTPUT' 
GROUP BY r1.host, r1.service 

但我認爲這是一種錯誤的方式。

MySQL 5.1.73

Answer 1

校正

現在，這應該這樣做！：

SELECT min(sp.id) as id FROM 
(SELECT hs.id, hs.host, hs.service, hs.output, so.id as soid 
FROM data hs 
INNER JOIN 
(SELECT id,host,service,output FROM data 
WHERE output = "STATIC OUTPUT") so 
ON so.host = hs.host and so.service = hs.service 
AND hs.id > so.id WHERE hs.output <> "STATIC OUTPUT") sp 
group by host,service, soid 
UNION 
SELECT id FROM data WHERE output = "STATIC OUTPUT"; 

Answer 2

您可以使用LIMIT語句選擇第一個匹配項。 https://dev.mysql.com/doc/refman/5.7/en/select.html

SELECT * FROM data LIMIT 1;

編輯：

此示例會發現你的ID來擦除

 
    CREATE OR REPLACE VIEW v AS 
    SELECT r1.id as id1 , r2.id as id2 FROM data r1 
    INNER JOIN data r2 ON r1.host=r2.host AND r1.service = r2.service 
    WHERE LOWER(r1.output) LIKE "static output" AND r1.id < r2.id; 

 
    SELECT DISTINCT id1 FROM v 
    UNION 
    SELECT DISTINCT id2 FROM v; 

輸出：

ID：1 3 6 8