This article from: http://www.cnblogs.com/xh831213/category/47654.htmlExplicitly converts an expression of a data type to another data type. CAST and CONVERT provide similar functionality.GrammarUsing CAST:CAST (expression as data_type)Using CONVERT:CONVERT (data_type[(length)], expression [, style])ParametersExpressionIs any valid microsoft®sql Server™ expression.Data_typeThe data types provided by the tar
Tags: sql1. The original table test structure is as follows:650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/57/16/wKiom1SRCDyj_Is1AABlHsTZB-k835.jpg "title=" 1.png " alt= "Wkiom1srcdyj_is1aablhstzb-k835.jpg"/>2. The result we want to get is:650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/57/16/wKiom1SRCIjyYmdnAABBtb-3S3Q100.jpg "title=" 2.png " alt= "Wkiom1srcijyymdnaabbtb-3s3q100.jpg"/>3, the first method: Static method, that is, column fixedSQL is as follows:SELECT * FROM
SQL query case: convert a column to a row using UNION ALL.
After the conversion of rows and columns, you may encounter the need to replace columns.
Create table TestColRow (Name VARCHAR (10 ),East INT,South INT,West INT,North INT);
Insert into TestColRowVALUES ('zhang san', 1, 2, 3, 4 );
Insert into TestColRowVALUES ('Lee 4', 5, 6, 7, 8 );
Processing with UNION ALL
SELECTName, 'east' AS Place, east
The main purpose is to try javacc and use the idea of compiling principles to construct your own language :)
First download javacc from your hometown of https://javacc.dev.java.net/javacc
Our goal today is to convert from teacher to select * from teacher
First, write the. JJ file.
1. Define the separator to be empty
SKIP:{""| "/T"| "/N"| "/R"| "/F"}
2. Define keywords. From is the hql keyword. Teacher is the class name entered by the user. It should b
The postgraduate entrance exam results are helpless. We had to wait for the national line. I have recently obtained a job. for work reasons, I need to convert a table in a database into XML. originally, SQL Server 2000 and later have the for XML function that can be used directly, but you have no choice but to writeCode. So I wrote one by myself. Below are several major functions, and the overall code will
The structure of the datasheet is--
The code is as follows
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CREATE TABLE [dbo]. [Ac_mainctls_new] ([ID] [int] NULL,[Ctlip] [bigint] Null[Ctlname] [Char] () COLLATE chinese_prc_ci_as NULL,)
Where Ctlip is the IP address of the device, stored in an integer manner.
Although you can use a program to convert an integer to an IP string, there is a bit more trouble with a process. So I want to turn it into an
At the beginning of the year has been doing a Web site MSSQL2000-> MySQL5 Migration work because of the use of different program systems, so the main problem in data migration. Because of the 2 system database structure is very large, not convenient to take the SQL Server to import MySQL ODBC data source features (also not recommended, field types, such as different points will kill the ~), so in Windows to write their own PHP script from
Label:The following code implements how to convert FireDAC detal to SQL 1 functionTfddatasethelper.deltatosql (ConstAkeyfields:string):string;
2 var
3 Row, Col:integer;4 Datsrow:tfddatsrow;5 Datatype:tfddatatype;6OldValue, NewValue:string;
7FieldNames, Values, Sqlwhere, TableName, Keyfields:string;
8 begin
9
TenResult: ="';
One
AKeyfields: =Akeyfields; - ifKeyfields.isempty Then
-Keyfields: =Updateop
Because the project needs to need so in the Web site, and now summed up a bit, I hope to help you, use the software has mss2sql, before using the software, please install SQLService and MySQL in the local first.Mss2sql:http://files.cnblogs.com/andrew-blog/mss2sql.rarReference: http://www.cnblogs.com/andrew-blog/archive/2011/12/03/SQL_mss2sql.htmlTo open a compressed package after downloadRun Mss2sqlThe default is move to MysQL server directly, select NextGo on, wait a minute.This time it is nece
Label:Reprint: http://www.cnblogs.com/angestudy/archive/2012/06/04/2533548.htmlMss2sql:http://files.cnblogs.com/andrew-blog/mss2sql.rarTo open a compressed package after downloadRun Mss2sqlThe default is move to MysQL server directly, select NextGo on, wait a minute.This time it is necessary to connect to MySQL server, I am local, so choose Local, fill in your username and passwordContinue waiting for connectionSelect the database that needs to be converted in MS SQLClick Next, if MySQL has the
@t Table(CHRnchar(1) Collate Chinese_prc_ci_as,letternchar(1))
INSERT into @t(Chr,letter)SELECT 'Acridine','A' UNION All SELECT 'Eight','B' UNION All
SELECT 'Cha','C' UNION All SELECT 'Otah','D' UNION All
SELECT 'Ehegan','E' UNION All SELECT 'Hair','F' UNION All
SELECT 'Xu','G' UNION All SELECT 'hafnium','H' UNION All
SELECT ' not','J' UNION All SELECT 'ka','K' UNION All
SELECT ' Garbage','L' UNION All SELECT '嘸','M' UNION All
SELECT 'Hallasa
Convert these files to. sql scripts with a local MySQL database1, install MySQL, version and font to be consistent with the server, otherwise garbled.2, with the CREATE DATABASE NAME; command to create a databaseMySQL data has the name folder3. Copy the *.frm,*.myd,*.myi file to the Data folder.4, cmd into the bin directory of MySQL, export with the command. SQL
then we can break down each point of the key.Partitioning is to split a table data into sub-collections, that is, to split a data file into multiple data files, but the storage of these files can rely on a filegroup or multiple filegroups, because more than one filegroup can increase the database access concurrency, but also can be different partitions configured to different disks to improve efficiency , the recommended partition is created with the same number of filegroups.1. Create filegrou
Copy Code code as follows:
' Converts a string into a database SQL statement format
'-------------------------------------------------
Function Allstr2database (Str,strtype)
Dim Strtemp:strtemp=str
Select Case Strtype
Case ""
Case "Num"
strtemp = CLNG (strtemp)
Case "string" without trim
strtemp = Replace (strtemp, "'", "")
Case "STR_BR" "no trim, convert carriage return to strtemp = replace
' Zao ', N ' ovens 'UNION ALL select ' Ze ', N ' 稄 'UNION ALL SELECT ' Zei ', N ' 鱡 'UNION ALL SELECT ' Zen ', N ' 囎 'UNION ALL select ' Zeng ', N ' giveaway 'UNION ALL SELECT ' Zha ', N ' winepress 'UNION ALL SELECT ' Zhai ', N ' partners 'UNION ALL SELECT ' Zhan ', N ' 驏 'UNION ALL select ' Zhang ', N ' 瞕 'UNION ALL select ' Zhao ', N ' 羄 'UNION ALL SELECT ' Zhe ', N ' 鷓 'UNION ALL select ' Zhen ', N ' gloom 'UNION ALL select ' Zheng ', N ' certificate 'UNION ALL select ' Zhi ', N ' 豒 'UNION
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