NameTaxcolumn.expression ="Price * 0.0862";//set the column to an expression that evaluates the values in a column or creates an aggregate column//Create the third column of a tableDataColumn Totalcolumn =NewDataColumn (); Totalcolumn.datatype= System.Type.GetType ("System.Decimal"); Totalcolumn.columnname=" Total"; Totalcolumn.expression="Price + Tax";//The column's expression is the first column and the second column worth and//Add all columns to t
We know that the GridView component in Yii is very useful.Dynamically display columns.To use the Visible propertyisset ($_gettruefalse], Dynamic display lines.Pay attention to rowoptions. According to the document he can receive arrays or anonymous functions. Writes the judgment logic to the anonymous function. Add a hidden class to the current line when you are satisfied. Equivalent to not showing.Widget ([' Dataprovider ' =$dataProvider, ' rowoptions ' =function($model,$key,$index,$grid){
An example of changing columns in an SQL grouping row (SQL Server 2000 has been okay) 1. The raw data in Table A is as follows:
Create Table [DBO]. [a] ([C1] [varchar] (50) Collate chinese_prc_cs_as null,[C2] [varchar] (50) Collate chinese_prc_cs_as null,[C3] [varchar] (50) Collate chinese_prc_cs_as null,[C4] [varchar] (50) Collate chinese_prc_cs_as null)
Insert into a ('123', 'sz ', '44', '123 ')Insert into a ('123', 'sz ', '44', '123 ')Insert into a
Sometimes you need to dynamically Add the column name of the datagridview:
System. windows. forms. datagridviewtextboxcolumn [] column = new datagridviewtextboxcolumn [columnnum]; for (INT I = 0; I
When dynamically adding rows and columns, do not assign datasource to the datagridview. If you assign a value to a able directly, problems may occur.
You also need to dynamically convert the datatable to add da
Sometimes our Excel tables have very many rows and columns of data, so when you move to the bottom of the data, the table head can not see, if the number of columns, once the right to move, the left of the serial number and see, so very inconvenient, there is no way to put the table head and serial number fixed it, of course, We can use the Excel Freeze pane feat
How to change the rows and columns of a database to thinkphp and mysql. Database:
The SQL statement for table creation is as follows:
CREATE TABLE `score_collect` ( `std_id` int(10) NOT NULL, `course_id` int(11) NOT NULL, `score` varchar(255) DEFAULT NULL, PRIMARY KEY (`std_id`,`course_id`), )
INSERT INTO `score_collect` VALUES ('2012508082', '2', '20'); INSERT INTO `score_collect` VALUES ('2
Original post address: http://hi.baidu.com/liyanlin84/blog/item/eb306616cdb51e1c972b4389.html
Delete all data in the table, and you want to automatically increase the column from 1! Use truncate table tblname
Truncate is a SQL statement used to delete data table content. It is used as follows:Truncate table [Table name].The following describes the methods and principles of the truncate statement in mssqlserver2000:The truncate table name is fast and efficient because:The truncate table funct
Today, a classmate gave me an Excel file, asked to read some rows, some columns, and then I tried to do a demo, here to share out, hoping to help everyone:
First install XLRD:
PIP3 Install XLRD
And then the code:
Import NumPy as NP
import xlrd
data = Xlrd.open_workbook (' lifetable_16.xlsx ')
table = data.sheets () [0] #
Print (table)
# nrows = table.nrows #行数
# ncols = table.ncols #列数
# c1=arange (0,
Oracle columns of multiple rows of data are spelled into a single line of charactersoracle provides two functions Wmsys.wm_concat and Listagg functions. www.2cto.com First Introduction: wmsys.wm_concat Example: ID name 1 aa 2 bb 3 cc knot The fruit is "aa,bb,cc" select Wmsys. Wm_concat (a.name) from User A In this case, the query results: "AA,BB,CC" www.2cto.com delimiter If you do not need
= 0.0;//Reset to the default $C.gridwidth = Gridbagconstraints.remainder;//End Row -C.gridheight = 1;//Reset to the default -Makebutton ("Button9", Gridbag, c); -Makebutton ("Button10", Gridbag, c); A +SetSize (300, 100); the } - $ Public Static voidMain (String args[]) the { theJFrame f =NewJFrame ("Gridbag Layout Example"); theF.setlocation (400, 200); theGRIDBAGEX2 Ex1 =NewGridBagEx2 (); - in ex1.init (); the theF.add ("Center", EX1); About F.pack (); the f.setsize (F.getpre
This article mainly introduces about NumPy array splicing, respectively, the combination of rows and columns on the example, has a certain reference value, now share to everyone, there is a need for friends can refer to
In the analysis of data, we will combine some sample data with multiple characteristics, put together to analyze, predict ....
The following is a concatenation of arrays using functions i
This time to bring you how to take NumPy array to specify the row and column, take numpy array to specify the column of attention to what, the following is the actual case, together to see.
The operation on the NumPy array is a bit cumbersome, but there is no way.
For example
A = [[4,5,6], [[7,8,9]]
Take a of 2 3 rows, 1 2 columns
c=[1,2] D =[0,1]
If written as
b = a[c,d] Output: [4 8]
Take the data from t
1#include 2 voidPinta[][3])//the "warning" two-dimensional array must give the specific data of the Dequeue3 {4 for(intI=0; i3; ++i)5 {6 for(intj=0; j3;++j)7printf"%d", A[i][j]);8printf"\ n");9 }Ten } One intMainintARGC,Char*argv[]) A { - intarr[3][3]={1,2,4, - 3,5,7, the 9,0,6 }; -printf"Original: \ n"); - P (arr); - for(intI=0; i3; ++i) + for(intJ=i; j3; ++j) - { + inttmp=Arr[i][j]; Aarr[i][j]=A
I have processed some XML data some days ago. When I read a book, I remember a method to split arrays in XML, which is widely used in the past two days. Record it.
-- In this example, the value of each segment is obtained by dividing an IP address. Of course, it can also be data or columns of other types of data: a-B-c-d, 3, 4, 5, 6, and so on.Declare @ ip varchar (15 );Set @ ip = '192. 168.1.123'-- Convert string to XMLDeclare @ ipx xml;Set @ ipx =
Today, I saw a friend on the forum asking about the problem of changing the columns of rows in the database table. I gave a solution to the problem by spelling SQL scripts.
I think this question is still a bit general, so I leave the question and answer here for the reference of friends who have similar questions. If anyone else has a better solution, please post it.
Code And everyone makes common progress
How to use SQL statements to convert rows and columns
Row-to-column conversion is a common requirement in the database system. During database design, in order to fit the accumulated storage of data, direct record is often used, while displaying data, you want to organize all records and display them in a transpose manner. Figure 9.1 shows the row/column conversion function.
Figure 9.1 re
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