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Update multiple rows in same query using PostgreSQL
...izable:
update test as t set
column_a = c.column_a
from (values
('123', 1),
('345', 2)
) as c(column_b, column_a)
where c.column_b = t.column_b;
You can add as many columns as you like:
update test as t set
column_a = c.column_a,
column_c = c.column_c
from (values
('12...
MySQL: Fastest way to count number of rows
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12 Answers
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HAproxy - Web负载均衡解决方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...s://www.haproxy.org/ （官方网站）
https://www.haproxy.org/download/1.8/src/haproxy-1.8.14.tar.gz （下载地址）
http://cbonte.github.io/haproxy-dconv/1.8/configuration.html （文档Haproxy 1.8 文档）
HAProxy提供高可用性、负载均衡以及基于TCP和HTTP应用的代理，...
Why does 'continue' behave like 'break' in a Foreach-Object?
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165
Simply use the return instead of the continue. This return returns from the script block which...
How to parse a CSV file using PHP [duplicate]
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201
Just use the function for parsing a CSV file
http://php.net/manual/en/function.fgetcsv.php
$ro...
What are the complexity guarantees of the standard containers?
...; Make an empty vector. O(1)
vector<T> v(n); Make a vector with N elements. O(n)
vector<T> v(n, value); Make a vector with N elements, initialized to value. O(n)
vector<T> v(begin, end); ...
Which terminal command to get just IP address and nothing else?
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181
You can write a script that only return the IP like:
/sbin/ifconfig eth0 | grep 'inet addr' |...
What is the difference between procedural programming and functional programming? [closed]
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17 Answers
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detach all packages while working in R
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10 Answers
10
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