unique

问题 I have a array of associative arrays aa[] = ('Tires'=>100, 'Oil'=>10, 'Spark Plugs'=>4 ); aa[] = ('Tires'=>454, 'Oil'=>43, 'Spark Plugs'=>3 ); aa[] = ('Tires'=>34, 'Oil'=>55, 'Spark Plugs'=>44 ); aa[] = ('Tires'=>454, 'Oil'=>43, 'Spark Plugs'=>45 ); aa[] = ('Tires'=>34, 'Oil'=>55, 'Spark Plugs'=>433 ); aa[] = ('Tires'=>23, 'Oil'=>33, 'Spark Plugs'=>44 ); Two Questions How can I remove duplicates according tot he field 'Oil' is there a array_unique which I can provide a callback which acts as

问题 I have this XML schema but I don't know how to complete it in order to achieve what I need. I searched a lot online about unique and keyref usage, but all I can find are basic examples. This is my schema: <xs:element name="access" type="myaccess" /> <xs:complexType name="myaccess"> <xs:sequence> <xs:element name="user" type="myuser" minOccurs="0" maxOccurs="unbounded"> <xs:unique name="u_idunique"> <xs:selector xpath="user" /> <xs:field xpath="@id" /> </xs:unique> </xs:element> <xs:element

问题 After this answer : Why are these hashcodes equals? I realized that GetHashCode intend is not to provide a unique identifier for an object. The purpose of this test was that I have a business function with 6 parameters : customerId serviceId startDate EndDate cmsThematicId And I don't want to be able to call this function more than once with the same values These parameters are inserted in the database, I could query with ( customerId = @customerId and serviceId = @serviceId ...), but I need

问题 I am a n00b at R and a n00b at stack overflow (just joined), so forgive me if I have failed to use markup (which I don't know) or missed something in the readme. If you don't mind, I will go through my full problem here as perhaps you might be kind enough to shed some insight into how I should best go about this! Stage 1 Construction of individual time-series objects for each TS1 Please find a data example below. Essentially, I am loading a csv file with multiple, irregular time-series in it

问题 $array = array( array( 'id' => 1, 'name' => 'John Doe', 'upline' => 0 ), array( 'id' => 2, 'name' => 'Jerry Maxwell', 'upline' => 1 ), array( 'id' => 3, 'name' => 'Roseann Solano', 'upline' => 1 ), array( 'id' => 4, 'name' => 'Joshua Doe', 'upline' => 1 ), array( 'id' => 5, 'name' => 'Ford Maxwell', 'upline' => 1 ), array( 'id' => 6, 'name' => 'Ryan Solano', 'upline' => 1 ), array( 'id' =>7, 'name' => 'John Mayer', 'upline' => 3 ), ); I want to make a function like: function get_downline(

问题 This question already has answers here : Finding ALL duplicate rows, including “elements with smaller subscripts” (5 answers) Closed 2 years ago . I have a dataframe where I would like to remove all rows with duplicates. For instance my dataframe looks like: > df <- data.frame(A = c("Happy", "Happy", "Sad", "Confused", "Mad", "Mad"), B = c(1, 2, 3, 4, 5, 6)) > df A B 1 Happy 1 2 Happy 2 3 Sad 3 4 Confused 4 5 Mad 5 6 Mad 6 I only want rows where the entries in A are unique to get: A B 1 Sad 3

问题 I have this function called on another page. function adminnav (){ $pagewcoms = mysql_query("SELECT DISTINCT pageid FROM comments") or die(mysql_error()); $idnavrow = mysql_fetch_row($pagewcoms); while ($itest = mysql_fetch_row($pagewcoms)) { echo "$itest[0] <br />"; } } adminnav(''); The table is. CREATE TABLE `comments` ( `commentid` int(5) NOT NULL auto_increment, `pageid` int(5) NOT NULL default '0', `name` text NOT NULL, `email` text NOT NULL, `comment` text NOT NULL, `date` datetime NOT

问题 I have a problems this mornig , I have tried many solutions and nothing gave me the expected result. I have a table that looks like this : +----+----------+-------+ | ID | COL2 | DATE | +----+----------+-------+ | 1 | 1 | 2001 | | 1 | 2 | 2002 | | 1 | 3 | 2003 | | 1 | 4 | 2004 | | 2 | 1 | 2001 | | 2 | 2 | 2002 | | 2 | 3 | 2003 | | 2 | 4 | 2004 | +----+----------+-------+ And I have a query that returns a result like this : I have the unique ID and for this ID I want to take the last date of

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . In C#, I want to have the list of 5 random numbers, that should contain unique values from 1 to 5? How can I achieve that? for example: 1,3,2,5,4 or 2,5,1,3,4 i.e. The list must contains 5 random numbers that should be having the numbers from 1 to 5 回答1: Random rnd = new Random(); var list = Enumerable.Range(1,

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . I would like to calculate unique words count in a table with jQuery or maybe SQL. I have no clue at the moment how to do this. So please forgive me when i dont give you my tries. This is the table: <table> <tr class="odd"> <td>450€ Job</td> <td>Aachen</td> </tr> <tr class="even"> <td>500€ Job</td> <td>Berlin</td