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  • Aggregate Functions on subsets of data based on current row values with SQL

    - by aasukisuki
    Hopefully that title makes sense... Let's say I have an employee table: ID | Name | Title | Salary ---------------------------- 1 | Bob | Manager | 15285 2 | Joe | Worker | 10250 3 | Al | Worker | 11050 4 | Paul | Manager | 16025 5 | John | Worker | 10450 What I'd like to do is write a query that will give me the above table, along with an averaged salary column, based on the employee title: ID | Name | Title | Salary | Pos Avg -------------------------------------- 1 | Bob | Manager | 15285 | 15655 2 | Joe | Worker | 10250 | 10583 3 | Al | Worker | 11050 | 10583 4 | Paul | Manager | 16025 | 15655 5 | John | Worker | 10450 | 10583 I've tried doing this with a sub-query along the lines of: Select *, (select Avg(e2.salary) from employee e2 where e2.title = e.title) from employee e But I've come to realize that the sub-query is executed first, and has no knowledge of the table alias'd e I'm sure I'm missing something REALLY obvious here, can anyone point me in the right diretion?

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  • How to pull data from a MySQL column and put it into a single array

    - by Rob
    Basically, this is what I currently use in an included file: $sites[0]['url'] = "http://example0.com"; $sites[1]['url'] = "http://example1.com"; $sites[2]['url'] = "http://example2.com"; $sites[3]['url'] = "http://example3.com"; $sites[4]['url'] = "http://example4.com"; $sites[5]['url'] = "http://example5.com"; And so I output it like so: foreach($sites as $s) But I want to make it easier to manage via a MySQL database. So my question is, how can I make it automatically add additional "$sites[x]['url'] = "http://examplex.com";" and output it appropriately from my MySQL table?

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  • submatrix from a matrix

    - by Grv
    A matrix is of size n*n and it consists only 0 and 1 find the largest submatrix that consists of 1's only eg 10010 11100 11001 11110 largest sub matrix will be of 3*2 from row 2 to row 4 please answer with best space and time complexity

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  • How to perform undirected graph processing from SQL data

    - by recipriversexclusion
    I ran into the following problem in dynamically creating topics for our ActiveMQ system: I have a number of processes (M_1, ..., M_n), where n is not large, typically 5-10. Some of the processes will listen to the output of others, through a message queue; these edges are specified in an XML file, e.g. <link from="M1" to="M3"</link> <link from="M2" to="M4"</link> <link from="M3" to="M4"</link> etc. The edges are sparse, so there won't be many of them. I will parse this XML and store this information in an SQL DB, one table for nodes and another for edges. Now, I need to dynamically create strings of the form M1.exe --output_topic=T1 M2.exe --output_topic=T2 M3.exe --input_topic=T1 --output_topic=T3 M4.exe --input_topic=T2 --input_topic=T3 where the tags are sequentially generated. What is the best way to go about querying SQL to obtain these relationships? Are there any tools or other tutorials you can point me to? I've never done graps with SQL. Using SQL is imperative, because we use it for other stuff, too. Thanks!

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  • Should an NSLock instance be "global"?

    - by Alex Reynolds
    Should I make a single NSLock instance in the application delegate, to be used by all classes? Or is it advisable to have each class instantiate its own NSLock instance as needed? Would the locking work in the second case, if I, for example, had access to a managed object context that is spread across two view controllers?

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  • Visual Studio ReportViewer repeating data block on every page

    - by muhan
    I am using Reportviewer to generate a sales invoice to be printed by the user. How can I get databound fields to be printed on every page of a multi page invoice? The invoice is printed on a pre-printed form. I want the printed form to look roughly like: page 1 customer john smith 123 main st. city, CA 90000 some item1 $100 some item2 $150 some item3 $150 page 2 customer john smith 123 main st. city, CA 90000 some item4 $500 some item5 $250 some item6 $950 Total $2100 Using 1 list which contains databound textbox fields for the customer info, and a table for the items. The problem is if there are many items such that the items flow over to page 2, the next page only contains items, and not the customer info which needs to be printed on second page as well. I tried using page header, but I can't use databound items in page header. Please Help!

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  • GWT: library for encoding/decoding arbitrary data in URL fragments

    - by Caffeine Coma
    Ajax applications, and GWT in particular, use the URL fragment (e.g. http://example.com/myapp#fragment) to maintain application state on the client without reloading the page. Is there a GWT library that facilitates the encoding and decoding of arbitrary parameters into the URL fragment? I'm looking for something analogous to the Servlet API's getParameter() method, but for client-side URL parameters.

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  • Linked Measure Groups and Local Dimensions

    - by ekoner
    Mulling over something I've been reading up on. According to Chris Webb, A linked measure group can only be used with dimensions from the same database as the source measure group. So I took this to mean as long as two cubes share a database, a linked measure group can be used with a dimension. So I created a new cube and added a local measure group, a local dimension and a linked measure group. However, I can't create a relationship between the linked measure group and the local dimension even though they are within the same database. I get the message below: Regular relationships in the current database between non-linked (local) dimensions and linked measure groups cannot be edited. These relationship can only be created through the wizard. This dialog can be used to delete these relationships. I see that I can go to the original cube and add the dimension there, but does the message below mean I have an alternative? I just know it's going to be something simple and trivial! Thanks for reading.

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  • How to Delete all data from a table which contain self referencing foreign key

    - by Shantanu Gupta
    I have a table which has employee relationship defined within itself. i.e. EmpID Name SeniorId ----------------------- 1 A NULL 2 B 1 3 C 1 4 D 3 and so on... Where Senior ID is a foreign key whose primary key table is same with refrence column EmpId I want to clear all rows from this table without removing any constraint. How can i do this? Deletion need to be performed like this 4, 3 , 2 , 1 How can I do this

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  • Error: The conversion of a nvarchar data type to a datetime data type resulted in an out-of-range value

    - by CPM
    I know that there are simmilar questions like this on the forum, however I am still having problems to update a datetime field o the database. I dont get any problems when inserting but I get problems when updating and I am formating the same way , like this: e.Values.Item("SelectionStartDate") = Format(startdate, "yyyy-MM-dd") + " " + startTime1 + ".000" startTime is of type string. I have tried different solution that I came across on the internet but still get this error. Please help. Thanks in advance

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  • Merging two SQLite database files (C# .NET)

    - by CODe
    Hello all, I'm using C#/.NET with the C# wrapper for SQLite. I'm attempting to merge two SQLite databases together while excluding duplicates. I found this, which is referenced from a few different forum questions. http://old.nabble.com/Attempting-to-merge-large-databases-td18131366.html Would I run the following queries in my SQLite configuration as listed below? attach 'c:\test\b.db3' as toMerge; insert into AuditRecords select * from toMerge.AuditRecords; My main question is whether the above will remove duplicates, and if it doesn't, is there a merge or some other command I can use? Thanks very much!

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  • Using Linq2Sql to insert data into multiple tables using an auto incremented primary key

    - by Thomas
    I have a Customer table with a Primary key (int auto increment) and an Address table with a foreign key to the Customer table. I am trying to insert both rows into the database in one nice transaction. using (DatabaseDataContext db = new DatabaseDataContext()) { Customer newCustomer = new Customer() { Email = customer.Email }; Address b = new Address() { CustomerID = newCustomer.CustomerID, Address1 = billingAddress.Address1 }; db.Customers.InsertOnSubmit(newCustomer); db.Addresses.InsertOnSubmit(b); db.SubmitChanges(); } When I run this I was hoping that the Customer and Address table automatically had the correct keys in the database since the context knows this is an auto incremented key and will do two inserts with the right key in both tables. The only way I can get this to work would be to do SubmitChanges() on the Customer object first then create the address and do SubmitChanges() on that as well. This would create two roundtrips to the database and I would like to see if I can do this in one transaction. Is it possible? Thanks

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  • unicode data with custom font doesn't work properly in ipad

    - by David Ohanyan
    I am using custom font for label and string which I am getting from unicode characters. And the font is not changing. here is the snippet of my code: NSString* str = @"\u05D0\u05D1\u05D2"; [mMatchingLabel setText:str]; mMatchingLabel.font = [UIFont fontWithName:@"David New Hebrew" size:26]; But when I write for example : NSString* str = @"label"; [mMatchingLabel setText:str]; mMatchingLabel.font = [UIFont fontWithName:@"David New Hebrew" size:26]; The font effect is evident. Can someone explain what's here wrong?

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  • NSPredicate by NSManagedObject for many-to-one lookups

    - by niklassaers
    Hi guys, I've got the scenario with two NSManagedObjects, Arm and Person. Between them is a many-to-one relationship Person.arms and inverse Arm.owner. I'd like to write a simple NSPredicate where I've got the NSManagedObject *arm and I'd like to fetch the NSManagedObject *person that this arm belongs to. I could make a textual representation and look for that, but is there a better way where I can look it up by identity? Something like this perhaps? NSEntityDescription *person = [NSEntityDescription entityForName:@"Person" inManagedObjectContext:MOC]; NSPredicate *personPredicate = [NSPredicate predicateWithFormat:@"%@ IN arms", arm]; Cheers Nik

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  • What's the best general programming book to review basic development concepts?

    - by Charles S.
    I'm looking for for a programming book that reviews basic concepts like implementing linked lists, stacks, queues, hash tables, tree traversals, search algorithms, etc. etc. Basically, I'm looking for a review of everything I learned in college but have forgotten. I prefer something written in the last few years that includes at least a decent amount of code in object-oriented languages. This is to study for job interview questions but I already have the "solving interview questions" books. I'm looking for something with a little more depth and explanation. Any good recommendations?

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  • how to store data in ram in verilog

    - by anum
    i am having a bit stream of 128 bits @ each posedge of clk,i.e.total 10 bit streams each of length 128 bits. i want to divide the 128 bit stream into 8, 8 bits n hve to store them in a ram / memory of width 8 bits. i did it by assigning 8, 8 bits to wires of size 8 bit.in this way there are 16 wires. and i am using dual port ram...wen i cal module of memory in stimulus.i don know how to give input....as i am hving 16 different wires naming from k1 to k16. **codeeee** // this is stimulus file module final_stim; reg [7:0] in,in_data; reg clk,rst_n,rd,wr,rd_data,wr_data; wire [7:0] out,out_wr, ouut; wire[7:0] d; integer i; //wire[7:0] xor_out; reg kld,f; reg [127:0]key; wire [127:0] key_expand; wire [7:0]out_data; reg [7:0] k; //wire [7:0] k1,k2,k3,k4,k5,k6,k7,k8,k9,k10,k11,k12,k13,k14,k15,k16; wire [7:0] out_data1; **//key_expand is da output which is giving 10 streams of size 128 bits.** assign k1=key_expand[127:120]; assign k2=key_expand[119:112]; assign k3=key_expand[111:104]; assign k4=key_expand[103:96]; assign k5=key_expand[95:88]; assign k6=key_expand[87:80]; assign k7=key_expand[79:72]; assign k8=key_expand[71:64]; assign k9=key_expand[63:56]; assign k10=key_expand[55:48]; assign k11=key_expand[47:40]; assign k12=key_expand[39:32]; assign k13=key_expand[31:24]; assign k14=key_expand[23:16]; assign k15=key_expand[15:8]; assign k16=key_expand[7:0]; **// then the module of memory is instanciated. //here k1 is sent as input.but i don know how to save the other values of k. //i tried to use for loop but it dint help** memory m1(clk,rst_n,rd, wr,k1,out_data1); aes_sbox b(out,d); initial begin clk=1'b1; rst_n=1'b0; #20 rst_n = 1; //rd=1'b1; wr_data=1'b1; in=8'hd4; #20 //rst_n=1'b1; in=8'h27; rd_data=1'b0; wr_data=1'b1; #20 in=8'h11; rd_data=1'b0; wr_data=1'b1; #20 in=8'hae; rd_data=1'b0; wr_data=1'b1; #20 in=8'he0; rd_data=1'b0; wr_data=1'b1; #20 in=8'hbf; rd_data=1'b0; wr_data=1'b1; #20 in=8'h98; rd_data=1'b0; wr_data=1'b1; #20 in=8'hf1; rd_data=1'b0; wr_data=1'b1; #20 in=8'hb8; rd_data=1'b0; wr_data=1'b1; #20 in=8'hb4; rd_data=1'b0; wr_data=1'b1; #20 in=8'h5d; rd_data=1'b0; wr_data=1'b1; #20 in=8'he5; rd_data=1'b0; wr_data=1'b1; #20 in=8'h1e; rd_data=1'b0; wr_data=1'b1; #20 in=8'h41; rd_data=1'b0; wr_data=1'b1; #20 in=8'h52; rd_data=1'b0; wr_data=1'b1; #20 in=8'h30; rd_data=1'b0; wr_data=1'b1; #20 wr_data=1'b0; #380 rd_data=1'b1; #320 rd_data = 1'b0; /////////////// #10 kld = 1'b1; key=128'h 2b7e151628aed2a6abf7158809cf4f3c; #20 kld = 1'b0; key = 128'h 2b7e151628aed2a6abf7158809cf4f3c; wr = 1'b1; rd = 1'b0; #10 wr = 1'b1; rd = 1'b1; #20 kld = 1'b0; key = 128'h 2b7e151628aed2a6abf7158809cf4f3c; #20 kld = 1'b0; key = 128'h 2b7e151628aed2a6abf7158809cf4f3c; wr = 1'b1; rd = 1'b1; #20 kld = 1'b0; key = 128'h 2b7e151628aed2a6abf7158809cf4f3c; wr = 1'b1; rd = 1'b1; #20 kld = 1'b0; key = 128'h 2b7e151628aed2a6abf7158809cf4f3c; wr = 1'b1; rd = 1'b1; #20 kld = 1'b0; key = 128'h 2b7e151628aed2a6abf7158809cf4f3c; wr = 1'b1; rd = 1'b1; #20 kld = 1'b0; key = 128'h 2b7e151628aed2a6abf7158809cf4f3c; wr = 1'b1; rd = 1'b1; #20 kld = 1'b0; key = 128'h 2b7e151628aed2a6abf7158809cf4f3c; wr = 1'b1; rd = 1'b1; #20 kld = 1'b0; key = 128'h 2b7e151628aed2a6abf7158809cf4f3c; wr = 1'b1; rd = 1'b1; #20 kld = 1'b0; key = 128'h 2b7e151628aed2a6abf7158809cf4f3c; wr = 1'b1; rd = 1'b1; #20 kld = 1'b0; key = 128'h 2b7e151628aed2a6abf7158809cf4f3c; wr = 1'b1; rd = 1'b1; #20 wr = 1'b0; #20 rd = 1'b1; #4880 f=1'b1; ///////////////////////////////////////////////// // out_data[i] end /*always@(*) begin while(i) mem[i]^mem1[i] ; i<=16; break; end*/ always #10 clk=~clk; always@(posedge clk) begin //$monitor($time," out_wr=%h,out_rd=%h\n ",out_wr,out); #10000 $stop; end endmodule

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  • Where can I find an introduction to using PDO?

    - by aslum
    I know my SQL safety isn't up to par. I've read on this site that PHP PDO would be a good first step, and while I did take a look at the PDO Manual it's a bit daunting. Is there somewhere I can find a tutorial on the basics of using PDO rather then straight MySQL calls?

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  • Jena Effects of Different Entailment Regimes

    - by blueomega
    I am trying sparql and the use of entailment. As a example i used http://www.w3.org/TR/2010/WD-sparql11-entailment-20100126/#t112 i try to put them in jena. OntClass book1= model.createClass(NS+"book1"); OntClass book2=model.createClass(NS+"book2"); OntClass book3=model.createClass(NS+"book3"); OntClass publication=model.createClass(NS+"publication"); OntClass article=model.createClass(NS+"article"); OntClass mit=model.createClass(NS+"MIT"); ObjectProperty a = model.createObjectProperty(NS+"a"); ObjectProperty publishes = model.createObjectProperty(NS+"publishes"); book1.addProperty(a, publication); book2.addProperty(a, article); publication.addSubClass(article); publishes.addRange(publication); mit.addProperty(publishes, book3); where model is type OntModel. and i used the query similar to the problem "PREFIX table: "I have correct namespace here"+ "SELECT *"+ "WHERE"+ "{"+ " ?x ?y table:publication ."+ "}"; The model was created like this. Hope OntModelSpec is ok. OntModel m = ModelFactory.createOntologyModel(OntModelSpec.OWL_MEM_RDFS_INF, null); i get as results from query x y | http://www.example.com/ontologies/sample.owl#publishes | rdfs:range | | http://www.example.com/ontologies/sample.owl#article | rdfs:subClassOf | | http://www.example.com/ontologies/sample.owl#book1 | http://www.example.com/ontologies/sample.owl#a | | http://www.example.com/ontologies/sample.owl#publication | rdfs:subClassOf | | http://www.example.com/ontologies/sample.owl#book3 | rdf:type | Can anyone give me a example, with and without entailment, so a cant try code, can get the results right.

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  • How to send large objects using boost::asio

    - by Max
    Good day. I'm receiving a large objects via the net using boost::asio. And I have a code: for (int i = 1; i <= num_packets; i++) boost::asio::async_read(socket_, boost::asio::buffer(Obj + packet_size * (i - 1), packet_size), boost::bind(...)); Where My_Class * Obj. I'm in doubt if that approach possible (because i have a pointer to an object here)? Or how it would be better to receive this object using packets of fixed size in bytes? Thanks in advance.

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  • how to make Sliding window model for data stream mining?

    - by zeedotcom
    we have a situation that a stream (data from sensor or click stream data at server) is coming with sliding window algorithm we have to store the last (say) 500 samples of data in memory. These samples are then used to create histograms, aggregations & capture information about anomalies in the input data stream. please tell me how to make such sliding window.

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  • Ruby on Rails: Find records based on a method in the model?

    - by sjsc
    I'm looking to use named_scope to find records based on a method in the model. Right now I have in my Order.rb model: def self.paid collect { |order| order if order.paid? } end # the method def paid order.payments.total >= order.total_price end That works, but I can't chain it if I have a shipped named_scope: named_scope :shipped, :conditions => "shipped is true" And I wanted to do: Order.paid.shipped which doesn't work. Any ideas?

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