Mysql 在同一列上左连接多个列

Question

基本上我想要实现的目标是 test.zfirewallaudit.src_ip和 test.zfirewallaudit.dst_ip要加入 inventory.dns_zones.ip 的字段列，所以我基本上可以为 inventory.dns_zones.subdomain 提供准确的主机名( test.zfirewallaudit.src_ip )和 test.zfirewallaudit.dst_ip 。所以基本上我想要一个 src_ip 子域的列和一个 dst_ip 子域的列。

SELECT test.zfirewallaudit.src_ip, 
test.zfirewallaudit.src_zone, 
test.zfirewallaudit.dst_ip, 
test.zfirewallaudit.dst_zone, 
test.zfirewallaudit.dst_port, 
test.zfirewallaudit.rulename, 
test.zfirewallaudit.application,
inventory.dns_zones.subdomain
FROM test.zfirewallaudit LEFT JOIN inventory.dns_zones ON zfirewallaudit.src_ip = inventory.dns_zones.ip OR zfirewallaudit.dst_ip = inventory.dns_zones.ip LIMIT 10;

问题是，我需要 inventory.dns_zones.subdomain对于test.zfirewallaudit.src_ip和...dst_ip值(value)观。当前查询只给了我 1 subdomain栏目

Answer 1

您需要加入 inventory.dns_zones 两次，一次用于源，一次用于目标:

SELECT test.zfirewallaudit.src_ip, 
test.zfirewallaudit.src_zone, 
test.zfirewallaudit.dst_ip, 
test.zfirewallaudit.dst_zone, 
test.zfirewallaudit.dst_port, 
test.zfirewallaudit.rulename, 
test.zfirewallaudit.application,
dns_zones_src.subdomain,
dns_zones_dst.subdomain
FROM test.zfirewallaudit
LEFT JOIN inventory.dns_zones AS dns_zones_src ON ( zfirewallaudit.src_ip = dns_zones_src.ip )
LEFT JOIN inventory.dns_zones AS dns_zones_dst ON ( zfirewallaudit.dst_ip = dns_zones_dst.ip )
LIMIT 10;