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Postgres and Indexes on Foreign Keys and Primary Keys
...n ('pg_catalog', 'pg_toast')
and pg_catalog.pg_table_is_visible(c.oid)
order by
n.nspname
,t.relname
,c.relname
If you want to delve further (such as columns and ordering), you need to look at pg_catalog.pg_index. Using psql -E [dbname] comes in handy for figuring out how to query...
Drop unused factor levels in a subsetted data frame
...
Also: this method does preserve the ordering of the variable.
– webelo
Jul 1 '16 at 0:36
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List OrderBy Alphabetical Order
...(x.LastName, y.LastName));
If you mean a new list:
var newList = people.OrderBy(x=>x.LastName).ToList(); // ToList optional
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How to get a specific output iterating a hash in Ruby?
...ash.each do |key, array|
puts "#{key}-----"
puts array
end
Regarding order I should add, that in 1.8 the items will be iterated in random order (well, actually in an order defined by Fixnum's hashing function), while in 1.9 it will be iterated in the order of the literal.
...
Where is the Java SDK folder in my computer? Ubuntu 12.04
... steps to get Java directory
Step 1:
$ whereis java
java: /usr/bin/java /etc/java /usr/share/java
That tells the command java resides in /usr/bin/java.
Dig again:
Step 2:
$ ls -l /usr/bin/java
lrwxrwxrwx 1 root root 22 2009-01-15 18:34 /usr/bin/java -> /etc/alternatives/java
So, now we k...
linux 下巧妙使用squid代理服务器 - 更多技术 - 清泛网 - 专注C/C++及内核技术
... -q squid
2.Squid代理服务的基本配置
2.1 Squid主配置文件是/etc/squid/squid.conf ，最基本的设置如下。
http_port 192.168.16.1:8080
cache_mem 64 MB
cache_dir ufs /var/spool/squid 4096 16 256
cache_effective_user squid
cache_effective_group squid
dns_nameserver...
Why Would I Ever Need to Use C# Nested Classes [duplicate]
...this ...
class A
{
//B is used to help implement A
class B
{
...etc...
}
...etc...
}
... you can always move the inner/nested class to global scope, like this ...
class A
{
...etc...
}
//B is used to help implement A
class B
{
...etc...
}
However, when B is only used to help...
Why is the gets function so dangerous that it should not be used?
...
In order to use gets safely, you have to know exactly how many characters you will be reading, so that you can make your buffer large enough. You will only know that if you know exactly what data you will be reading.
Instead of...
How to export all data from table to an insertable sql format?
...me
, u.ColumnValue
FROM
(SELECT
ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) AS rn,
'
+ CHAR(13) + @ColumnsCast
+ CHAR(13) + 'FROM [' + @SchemaName + '].[' + @TableName + '] s'
+ CHAR(13) + 'WHERE 1 = 1'
+ CHAR(13) + COALESCE(@WhereClause,'')
+ CHAR(13) ...
JavaScript hashmap equivalent
... three major ways to keep a collection of objects addressable by a key:
Unordered. In this case to retrieve an object by its key we have to go over all keys stopping when we find it. On average it will take n/2 comparisons.
Ordered.
Example #1: a sorted array — doing a binary search we will find...