count

问题 I am trying to create a query, to find the count of total number of answers (that I have give in stackoverflow) corresponding to each tag. Through this, I am able to find total count of my accepted, scored and unscored answers. And using this, I am able to find how many upvotes do I have of each tag. I ran the below query in the data.StackExcange to get the desired result, but I did not succeed. This is my query: DECLARE @UserId int = ##UserId## SELECT --TOP 20 TagName, count(a.Id) as

问题 I am trying to create a query, to find the count of total number of answers (that I have give in stackoverflow) corresponding to each tag. Through this, I am able to find total count of my accepted, scored and unscored answers. And using this, I am able to find how many upvotes do I have of each tag. I ran the below query in the data.StackExcange to get the desired result, but I did not succeed. This is my query: DECLARE @UserId int = ##UserId## SELECT --TOP 20 TagName, count(a.Id) as

问题 I need to count different values on a column, such as: Hours 1 1 2 null null null The result must be: 3 . My query is: select count(distinct hour) from hours; but it returns: 2. I tested also: select count(*) from hours group by hour but it returns three rows: (1) 3 (2) 2 (3) 1 How can I count null values as 1 value and use distinct to avoid count repeated values? I'm learning advanced SQL, they want me these requirements for all the solutions: Try to minimize the number of subqueries you

问题 I am trying to customize the pagination query for CakePHP I am using a Model based around a view. The view has some complex calculations in it and when the pagination runs it takes about 3 seconds to pull the 20 rows or so. Then it is running the same view wrapped in a count for the count used in pagination. I can run a simple table count on another table which would cut the load times in half but I am unable to find a simple way to customize a seperate query to run for the counts. Is this

问题 I have the following array with sub arrays [0] through [9]. I want to test the array and see if there is One sub array or more than one. Why? Because sometimes I get one record back from some tables and I have to be able to tell whether I can save it as is or should I use a foreach to save it. I'm building an if-then statement to determine if one record then do x or if there is two or more then do y and use the foreach method. I have yet to be able to isolate the sub array and count them

问题 I want to find the total number of active users who are members of the user table in my database. But I get an error like this: DataBinding: 'System.Data.DataRowView' does not contain a property with name 'userid' My code is as follows: <asp:Repeater ID="Repeater1" runat="server" DataSourceID="SqlDataSource1"> <ItemTemplate> <h3><%#Eval("userid") %></h3> </ItemTemplate> </asp:Repeater> <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings

问题 How can i count the number of uploaded files? This is my form: <div id="dragAndDropFiles" class="uploadArea"> <h1>Drop Images Here</h1> </div> <form id="sfmFiler" class="sfmform" method="post" enctype="multipart/form-data"> <input type="file" name="file" id="file" multiple /> <input type="submit" name="submitHandler" id="submitHandler" class="buttonUpload" value="Upload"> </form> and this is the piece of php which uploads the files: if($_SERVER['REQUEST_METHOD'] == "POST") { $tmpFilePath = $

问题 I have a dataframe like this: df = spark.createDataFrame([(0, ["B","C","D","E"]),(1,["E","A","C"]),(2, ["F","A","E","B"]),(3,["E","G","A"]),(4,["A","C","E","B","D"])], ["id","items"]) which creates a data frame df like this: +---+-----------------+ | 0| [B, C, D, E]| | 1| [E, A, C]| | 2| [F, A, E, B]| | 3| [E, G, A]| | 4| [A, C, E, B, D]| +---+-----------------+ I would like to get a result like this: +---+-----+ |all|count| +---+-----+ | F| 1| | E| 5| | B| 3| | D| 2| | C| 3| | A| 4| | G| 1|

问题 I need to count digits from a float number and keep the number. I can use scanf() with %f or %c but not %s , and I can use getchar() . I can use getchar but I will loose the number. 回答1: Why will you lose the number with getchar ? Read characters with getchar until you hit whitespace/enter/end of input Collect them all into a single string Use strtod to make sure it's a valid floating point value Count digits in the string - either before, or after the point, whatever you need. If you're

问题 I am using R and I would like to convert a standard vector of integers into a 2-column data frame showing the the number of elements in each vector that fall within a specified-sized window. For instance take this vector: 1, 75, 79, 90, 91, 92, 109, 120, 167, 198, 203, 204, 206, 224, 230, 236, 240, 245, 263, 344 The results for looking at the values that fall with in a window-size of 50 should look like this: 50 1 100 5 150 2 200 2 250 8 300 1 350 1 400 0 With the first column as the number