大约有 42,000 项符合查询结果（耗时：0.0125秒） [XML]
Select rows which are not present in other table
...task, all of them standard SQL.
NOT EXISTS
Often fastest in Postgres.
SELECT ip
FROM login_log l
WHERE NOT EXISTS (
SELECT -- SELECT list mostly irrelevant; can just be empty in Postgres
FROM ip_location
WHERE ip = l.ip
);
Also consider:
What is easier to read in EXISTS...
Windows下通过端口号查找出对应的进程名称 - 更多技术 - 清泛网 - 专注C/C+...
Windows下通过端口号查找出对应的进程名称有时，看到电脑在监听一个端口，但不知道是哪个程序在监听此端口，此时就可以用下面的方法找出该应用程序。首先打开CMD窗口，运行netstat ...有时，看到电脑在监听一个端口，但不知...
OpenSuSE 15.1 防火墙端口开放 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
OpenSuSE 15.1 防火墙端口开放opensuse-firewall-configOpenSuSE 15 1添加防火墙规则（比如3306端口）：firewall-cmd --permanent --zone=public --add-port=3306 tcp规则生效：firewall-cmd --reloadOpenSuSE 15.1添加防火墙规则（比如3306端口）：
firewall-cmd --permanent ...
Discuz邮件设置使用SSL加密发送 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...了而返回的是错误~原因是现在各大邮件服务商都关闭了25端口，只能用ssl 465端口才能发送邮件~。只需要在SMTP服务器地址前加ssl discuz有很多人没有发现自己的论坛邮箱发送不出邮件了
而返回的是错误~
原因是现在各大邮件服...
How to get the client IP address in PHP [duplicate]
...the IP to a database as a string, make sure you have space for at least 45 characters. IPv6 is here to stay and those addresses are larger than the older IPv4 addresses.
(Note that IPv6 usually uses 39 characters at most but there is also a special IPv6 notation for IPv4 addresses which in its full...
How to get a user's client IP address in ASP.NET?
...TE_ADDR")
Else
Dim ipArray As String() = sIPAddress.Split(New [Char]() {","c})
Return ipArray(0)
End If
End Function
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LEGO EV3 机器人按键控制 · App Inventor 2 中文网
...人结构有所不同，不必担心，只需确保两个电机（连接到端口B和C）位于机器人的相对两侧即可。
这种类型的机器人底座被称为差分驱动平台（Differential Drive Platform）。因为机器人的行为可以根据电机速度轻松调整：
前进...
Simple C example of doing an HTTP POST and consuming the response
...lude <netdb.h> /* struct hostent, gethostbyname */
void error(const char *msg) { perror(msg); exit(0); }
int main(int argc,char *argv[])
{
/* first what are we going to send and where are we going to send it? */
int portno = 80;
char *host = "api.somesite.com";
...
改用 443 端口连接 Github 修复 git push 时出现 Connection timed out 的...
改用 443 端口连接 Github 修复 git push 时出现 Connection timed out 的问题use-443-port-fix-github-connection-timeout参考资料最近几天我这里出现了git push出现 timeout 的问题：$ git pushssh: connect to host github com port 22: Connection timed outfatal: Could not read ...
SQL - Query to get server's IP address
...
SELECT
CONNECTIONPROPERTY('net_transport') AS net_transport,
CONNECTIONPROPERTY('protocol_type') AS protocol_type,
CONNECTIONPROPERTY('auth_scheme') AS auth_scheme,
CONNECTIONPROPERTY('local_net_address') AS loc...