rows

问题 Is there a way in MySQL to do a single SQL statement that returns the selected rows along with the count of the result rows? I can do this: SELECT COUNT(*) FROM BigTable WHERE firstname LIKE 'a%'; Which gives me a single result row with the count (37,781). I can get the actual row data like this: SELECT firstname FROM BigTable WHERE firstname LIKE 'a%'; which displays the actual 37,781 rows. But when I try to combine them, like this: SELECT firstname, COUNT(*) FROM BigTable WHERE firstname

问题 I have created an rdl doc that points at a proc that returns 90 000 rows and I am getting an out of memory exception. Is there a limit to how many rows the report projects can handle? Currently I have changed the proc that drives my report to just do a select Top 90 000. My specs are to be able to create a report with 120 000 rows. My report is a matrix. I swear last week I generated a report that has 106800 rows in it but now all of sudden I can't. I have written a rendering extension and

问题 I tried to update selected rows in DataGridView, but the result is strange, it always missing a row or another. The problem is when I click btnSettled button to set the settled date, then click btnUpdate to update the database, the result seems ok, but after click btnRefresh to refresh the DGV, there is always a missing row. Is that the problem on UpdateCommand or foreach loop? Please help me to solve this problem. Thank you. before click btnSettle after click btnSettled and btnUpdate after

问题 This question already has answers here : Find complement of a data frame (anti - join) (7 answers) How to join (merge) data frames (inner, outer, left, right) (13 answers) Closed 4 years ago . I'm new to R but from what I've been reading this one is a bit hard for me. I have two data frames, say DF1 and DF2, both of which have a variable of interest, say idFriends, and I want to create a new data frame where all the rows that do not appear in DF2 are deleted from DF1 based on the values of

问题 I have a database loaded with different churches information, I am trying to insert all the information from the database into a PHP table with 3 rows. I would like the structure of each cell to be: Church Name Image Pastor Name I can easily insert all data into a table, but I cannot get it to display as 3 rows. echo("<table>"); while($row = mysql_fetch_array($rs)) { echo("<tr>"); echo("<td>"); echo("<a href='" . $row['website'] . "'>" . $row['churchName'] . "</a><br>"); echo("<img src=\"" .

问题 I want to get data from Datagridview to text boxes but i want every row i select should be show in multiple text boxes? I am doing it but it is only select one row and show in one text box but i want to get data of multiple rows to multiple Textboxes. private void dataGridView_1CellMouseClick(object sender, DataGridViewCellMouseEventArgs e) { // to set oem no to textfield particular. dataGridView1.Refresh(); try { int i; i = dataGridView1.SelectedCells[0].RowIndex; Particular1Txt.Text =

问题 I would like to exclude lines containing a string "REVERSE", but my lines do not match exactly with the word, just contain it. My input data frame: Value Name 55 REVERSE223 22 GENJJS 33 REVERSE456 44 GENJKI My expected output: Value Name 22 GENJJS 44 GENJKI 回答1: This should do the trick: df[- grep("REVERSE", df$Name),] Or a safer version would be: df[!grepl("REVERSE", df$Name),] 回答2: Actually I would use: df[ grep("REVERSE", df$Name, invert = TRUE) , ] This will avoid deleting all of the

问题 I populate an array of numbers with some criteria and then what I am trying to get to is deleted all of the rows that are in this area. Basically I go through a column and if in that specific row, the cell in this column matches a criteria, I add that row number into an array. After it is done going through all rows I want to delete all of the row numbers. I'm having trouble figuring out how to delete all rows at once because obviously if I do it one at a time the row numbers change as the

问题 I have got a DataGridView with several columns, one being the "Calibration Due Date". I'm looking for a way to change the color of a row to RED if the calibration due date has passed, and to BLUE if there is less than one month until the calibration due date. I have tried the following code which didn't do anything: private void Form1_Load(object sender, EventArgs e) { foreach (DataGridView row in instrumentsDataGridView.Rows) { var now = DateTime.Now; var expirationDate = DateTime.Parse

问题 I'm trying to find the sum of specific values within a table, using SQL. A sample table is: +-------+-------+-------+-------+-------+-------+-------+ | ID | Co1 | Va1 | Co2 | Va2 | Co3 | Va3 | +-------+-------+-------+-------+-------+-------+-------+ | 01 | AA1 | 23.0| AA2 | 11.2| AA3 | 328.34| | 02 | AA2 | 27.0| AA3 | 234.56| AA4 | 23.8| | 03 | AA1 | 409.01| AA4 | 234.98| NULL | NULL | +-------+-------+-------+-------+-------+-------+-------+ I have 35 such 'Code' columns and values. What I