Question

我想知道是否可以在SQLite中将两个语句组合成一个语句。

第一个陈述如下：

SELECT MAX(goodput_mbps), packetsize_bytes 
FROM data 
WHERE src = "A" AND dst = "B" 
GROUP BY packetsize_bytes

产生类似的东西：

(1.065251641628522, 32)
(2.023058064838313, 64)
(3.9937457226166333, 128)
(7.13931248161879, 256)
(9.732371794078158, 384)
(12.030082350641777, 512)
(14.941748420411137, 640)
(16.768300606617814, 768)
(19.55032187231529, 1028)
(21.54109687187735, 1280)
(23.025071751003825, 1460)
(15.871752691948677, 1534)
(17.309115863006014, 1788)
(18.40483524961694, 2048)

对于每个条目，我然后使用WHERE子句的参数运行另一个SQL查询，每个记录的第一个和第二个条目，例如我将运行的前一个结果集的第一个条目：

SELECT MAX(median)-MIN(median) / MAX(bitrate_mbps)-MIN(bitrate_mbps), packetsize_bytes 
FROM data 
WHERE src = "A" and dst = "B" and packetsize_bytes = 32 and bitrate_mbps < 1.12 
ORDER BY bitrate_mbps ASC

产生类似的东西：

(0.035000000000000225, 32)

基本上我想要一个产生如下内容的查询：

(x, 32)
(x, 64)
(x, 128)
(x, 256)
(x, 384)
(x, 512)
(x, 640)
(x, 768)
(x, 1028)
(x, 1280)
(x, 1460)
(x, 1534)
(x, 1788)
(x, 2048)

这在SQLite中是否可行？我知道有WHERE IN子句但它似乎接受一个参数。

Answer 1

SELECT MAX(median)-MIN(median) / MAX(bitrate_mbps)-MIN(bitrate_mbps), 
       packetsize_bytes 
FROM 
    (SELECT MAX(goodput_mbps) , packetsize_bytes 
    FROM data 
    WHERE src = "A" AND dst = "B" 
    GROUP BY packetsize_bytes) 

WHERE packetsize_bytes = 32 and bitrate_mbps < 1.12 
ORDER BY bitrate_mbps ASC

Answer 2

您没有指定＆＃34;合并＆＃34;，但如果您只想获得两个查询的结果，则可以将它们与UNION ALL结合使用：

SELECT MAX(goodput_mbps), packetsize_bytes
FROM data
WHERE src = 'A' AND dst = 'B'
GROUP BY packetsize_bytes

UNION ALL

SELECT MAX(median)-MIN(median) / MAX(bitrate_mbps)-MIN(bitrate_mbps),
       packetsize_bytes
FROM data
WHERE src = 'A' AND dst = 'B'
  AND packetsize_bytes = 32 AND bitrate_mbps < 1.12

ORDER BY bitrate_mbps ASC

Answer 3

SELECT MAX(d1.median)-MIN(d1.median) / MAX(d1.bitrate_mbps)-MIN(d1.bitrate_mbps), d2.packetsize_bytes 
FROM data d1, (SELECT MAX(goodput_mbps), packetsize_bytes FROM data WHERE src = "A" AND dst = "B" GROUP BY packetsize_bytes) d2  
WHERE d1.src = "A" and d1.dst = "B" and d1.packetsize_bytes = d2.packetsize_bytes and d1.bitrate_mbps < "d2.MAX(goodput_mbps)"  
GROUP BY d2.packetsize_bytes
ORDER BY d2.packetsize_bytes ASC

Answer 4

不，你不能，因为SQLite本身不支持分析函数，也不支持pl / sql。

结合两个SQL语句

4 个答案: