[英]mysql distinct results after join
我對以下查詢感到很頭疼。 我認為問題是AND部分返回的結果重復。 Mysql對於以下查詢返回14個結果,但實際上只是2個不同的結果。
select date_format(published,'%Y-%m'),severity,count(severity)
FROM nvdcve
LEFT JOIN nvdproducts USING(cve_id)
where (published >= '2013-06-01')
AND (
(nvdproducts.company='linux' and nvdproducts.product='linux_kernel
AND nvdproducts.version IN (SELECT Kernel from Versions.VIEW_kernel))
OR (nvdproducts.company='apache' and nvdproducts.product='http_server'
AND nvdproducts.version IN (SELECT Httpd from Versions.VIEW_httpd))
OR (nvdproducts.company='sendmail' and nvdproducts.product='sendmail' AND nvdproducts.version IN (SELECT Sendmail from Versions.VIEW_sendmail))
OR (nvdproducts.company='mysql' and nvdproducts.product='mysql' AND nvdproducts.version IN (SELECT Mysqld from Versions.VIEW_mysqld))
OR (nvdproducts.company='proftpd' and nvdproducts.product='proftpd' AND nvdproducts.version IN (SELECT Proftpd from Versions.VIEW_proftpd))
OR (nvdproducts.company='perl' and nvdproducts.product='perl' AND nvdproducts.version IN (SELECT Perl from Versions.VIEW_perl))
OR (nvdproducts.company='openssl' and nvdproducts.product='openssl' AND nvdproducts.version IN (SELECT Sslinuse from Versions.VIEW_sslinuse))
)
group by date_format(published,'%Y-%m'),severity;
此摘要查詢給出此結果。
+--------------------------------+----------+-----------------+
| date_format(published,'%Y-%m') | severity | count(severity) |
+--------------------------------+----------+-----------------+
| 2013-06 | MEDIUM | 14 |
+--------------------------------+----------+-----------------+
我能得到的最接近的是獲取行,但是我丟失了計數並添加了cve_id,這不是我想要的。
select distinct cve_id,date_format(published,'%Y-%m'),severity
FROM nvdnew.nvdcve
LEFT JOIN nvdproducts USING(cve_id)
where (published > '2013-05-31')
and published < '2013-07-01'
AND (
(nvdproducts.company='linux' and nvdproducts.product='linux_kernel' AND nvdproducts.version IN (SELECT Kernel from Versions.VIEW_kernel))
OR (nvdproducts.company='apache' and nvdproducts.product='http_server' AND nvdproducts.version IN (SELECT Httpd from Versions.VIEW_httpd))
OR (nvdproducts.company='sendmail' and nvdproducts.product='sendmail' AND nvdproducts.version IN (SELECT Sendmail from Versions.VIEW_sendmail))
OR (nvdproducts.company='mysql' and nvdproducts.product='mysql' AND nvdproducts.version IN (SELECT Mysqld from Versions.VIEW_mysqld))
OR (nvdproducts.company='proftpd' and nvdproducts.product='proftpd' AND nvdproducts.version IN (SELECT Proftpd from Versions.VIEW_proftpd))
OR (nvdproducts.company='perl' and nvdproducts.product='perl' AND nvdproducts.version IN (SELECT Perl from Versions.VIEW_perl))
OR (nvdproducts.company='openssl' and nvdproducts.product='openssl' AND nvdproducts.version IN (SELECT Sslinuse from Versions.VIEW_sslinuse))
)
order by published;
這是結果。
+---------------+--------------------------------+----------+
| cve_id | date_format(published,'%Y-%m') | severity |
+---------------+--------------------------------+----------+
| CVE-2013-2128 | 2013-06 | MEDIUM |
| CVE-2013-1862 | 2013-06 | MEDIUM |
+---------------+--------------------------------+----------+
2 rows in set (0.00 sec)
將所有nvdproducts
檢查移到子查詢中,以便可以在其中使用SELECT DISTINCT
來防止重復。
SELECT DATE_FORMAT(published,'%Y-%m'), severity, COUNT(severity)
FROM nvdcve
LEFT JOIN (SELECT distinct cve_id
FROM nvdproducts
WHERE (nvdproducts.company='linux' and nvdproducts.product='linux_kernel' AND nvdproducts.version IN (SELECT Kernel from Versions.VIEW_kernel))
OR (nvdproducts.company='apache' and nvdproducts.product='http_server' AND nvdproducts.version IN (SELECT Httpd from Versions.VIEW_httpd))
OR (nvdproducts.company='sendmail' and nvdproducts.product='sendmail' AND nvdproducts.version IN (SELECT Sendmail from Versions.VIEW_sendmail))
OR (nvdproducts.company='mysql' and nvdproducts.product='mysql' AND nvdproducts.version IN (SELECT Mysqld from Versions.VIEW_mysqld))
OR (nvdproducts.company='proftpd' and nvdproducts.product='proftpd' AND nvdproducts.version IN (SELECT Proftpd from Versions.VIEW_proftpd))
OR (nvdproducts.company='perl' and nvdproducts.product='perl' AND nvdproducts.version IN (SELECT Perl from Versions.VIEW_perl))
OR (nvdproducts.company='openssl' and nvdproducts.product='openssl' AND nvdproducts.version IN (SELECT Sslinuse from Versions.VIEW_sslinuse))
) nvdproducts
USING (cve_id)
WHERE published >= '2013-06-01'
GROUP BY DATE_FORMAT(published,'%Y-%m'), severity;
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