@ rocrocket programming] $ sort-n-k 2-T: facebook.txtApple: 10: 2.5Orange: 20: 3.4Banana: 30: 5.5Pear: 90:2.3
We use the colon as the delimiter and sort the values in ascending order for the second column. The result is satisfactory.
7. Other common sort options
-F converts lowercase letters to uppercase letters for comparison, that is, the case is ignored.
-C checks whether the file is sorted out. If the file is in disordered order, information about the first unordered row is output, and 1 is
supports advanced features such as bandwidth control, Port Mirroring, Port VLAN, IEEE 802.1X authentication, UPnP, DDNS, VPN Pass-through, firewall, and system security logs. The configuration interface of this vro is a friendly Chinese interface, which is easy to configure and can be upgraded online.
Product reviews: TP-LINK is a well-known local brand, product cost-effective advantage is more prominent, this dual WAN port router can be connected to different ISP, support load balancing strate
values in the dataName or index.name can rename the dataThe Dataframe data frame, also a data structure, is similar to the one in Rdata={' year ': [2000,2001,2002,2003],' Income ': [3000,3500,4500,6000]}DATA=PD. DataFrame (data)Print (data)The result is:Income year0 3000 20001 3500 20012 4500 20023 6000 2003DATA1=PD. DataFrame (data,columns=[' year ', ' income ', ' outcome '),Index=[' A ', ' B ', ' C ', ' d '])Print (DATA1)The result is:Year Income o
determine the null value ();
select * from employee where isnull(sal); select * from employee where !isnull(sal);
5: between min and max ps in the interval (between): Here is a closed interval
select * from employee where sal between 4500 and 5000;
6: Not in the interval
select * from employee where sal not between 4500 and 5000;-- Null is not included
7: and or
Select * from employee where sal not betwe
troubleshooting needs to collect what information
Server information:
1. Machine model
2, Machine serial number (s/n: such as: NC00075534)
3, Bios version
4, whether to increase other equipment, such as network card, SCSI card, memory, CPU
5, how to configure the hard disk, whether to do array, array level
6, install what operating system and version (Winnt 4, Netware, Sco, others)
Fault information:
1, on the post, the screen displays the exception information
2, the status of the se
Transferred from: http://time-track.cn/postgresql-window-function.htmlPostgreSQL provides the properties of the window function. The window function is also the data that computes some rowset (a collection of multiple rows, which we call window frame), somewhat similar to the aggregation function (aggregate functions). Unlike regular aggregation functions, however, window functions do not merge rows that participate in the calculation into one line of output, but rather retain their original app
determine the null value ();Select * from employee where isnull (sal );Select * from employee where! Isnull (sal );5: between min and max ps in the interval (between): Here is a closed intervalSelect * from employee where sal between 4500 and 5000;6: Not in the intervalSelect * from employee where sal not between 4500 and 5000; -- null is not included7: and orSelect * from employee where sal not between
1. Enter your own salary to calculate the personal income tax: according to the current tax rate (find your own tax rate)
public static void Main (string[] args) {System.out.println ("Please enter your salary:");Scanner sc=new Scanner (system.in);Double money=sc.nextdouble ();Double total=0.0;total=money-3500;Double revenue=0.0;if (totalSystem.out.println ("Congratulations, no watering");}else if (totalrevenue=total*0.03;}else if (total>1500totalrevenue=1500*0.03+ (total-1500) *0.1;}else if (tot
of multiple pieces of paper feed. It has little to do with the paper jam. You can check the paper wheel and the transfer roller under the tab. They are more likely to be damaged, if damaged, replace it.Q: Why does the printing on Samsung 4500 appear light after powder is added?A: First of all, when adding powder, you must clean all the powder in the original powder warehouse, and scrape the scraper of the powder warehouse with a metal appliance. (One
the Internet by filtering unnecessary transmission in the network.
For example, when the fddi site has a message to be sent to the ieee 802.3 csma/cd network on the internet, you need to complete the following work:
· The site first transmits the message to the llc layer and adds the llc header.
· Send the packet to the mac layer and add the fddi header. The maximum length of an fddi packet is 4500 bytes. packets larger than this value can be sent in
(three servers): ed2k: // | server | no1.eserver.emule.org.cn | 8080 |/No1.eserver.emule.org.cn (actual IP address of the server in this group ):Ed2k: // | server | 59.60.30.132 | 8080 |/Ed2k: // | server | 222.73.207.86 | 8080 |/Ed2k: // | server | 221.130.199.116 | 8080 |/Note: For A New VC server, the nickname of eMule must contain the keyword [VeryCD] to connect to the server 1.
No2.eserver.emule.org.cn (two Telecom servers): ed2k: // | server | no2.eserver.emule.org.cn | 8080 |/The actual
;>>>>>>>>>>>>>>>>>>>>>>>> >>>> Problem Analysis >>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>At a glance, thought to enumerate, the whole table out, and then found that the more familiar with the picture, the figure is rotated, this is not the primary school books on the digital pyramid and so on mdzz ...It's obvious that *¥ ... Isn't it?Well, then, it can be found that each line ends "the number of the end of the singular line at the far right, the number of even lines opposite" is clearly the ordina
How to perform an ascending integer with a 500 increment condition:
Progressive to 500,
Rule: If the current value is 4200, it will be automatically converted to 4500; if the current value is 4700, it will be changed to 5000; if the value is 4500 or 5000, it will not change.
Reply to discussion (solution)
$ D = array (4200,470 0, 5000,450 0); foreach ($ d as $ v) {printf ("% d: % d \ n", $ v, ce
value. That is, the interval range of each box is a constant called the box width.
User-defined intervals: You can customize intervals as needed. This method can be used to help you easily observe the data distribution within certain intervals.
For example, the value of the customer's income attribute income after sorting (RMB): 800 1000 1200 1500 1500 1800 2000 2300 2500 2800 3000 3500 4000 4500. The binning result is as follows.
Uniform weight: Set
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