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A MySQL tutorial exists that the record is updated, the SQL that does not exist is inserted into the recordINSERT Table Values (1, ' yourname') on DUPLICATE KEY UPDATE auto_name= 'yourname'On DUPLICATE KEY Update usageIf you specify an on DUPLICATE

When sorting the viewing background, a requirement such as this is met, in the movie table there are ID (primary key auto-increment) and orderby (sort field ), suppose there are 10 Data IDs from 1 to 10, and the corresponding orderby is also from 1

DDL-Data Definition Language (Create, Alter, Drop, DECLARE)DML-data manipulation language (Select, Delete, Update, Insert)DCL-Data Control Language (GRANT, REVOKE, COMMIT, ROLLBACK)First, we will briefly introduce the basic statements:1. Description:

INSERT syntax INSERT [LOW_PRIORITY | DELAYED | HIGH_PRIORITY] [IGNORE] [INTO] tbl_name [(col_name,...)] VALUES ({expr | DEFAULT },...), (...),... [ONDUPLICATEKEYUPDATEcol_nameexpr,...] or: INSERT [LOW_PRIORITY | DELAYED | HIGH _ INSERT syntax INSERT

given a two-dimensional array, sort the two-dimensional array in column I (i starts with 1), and if column I is the same, sort the same rows bythe elements of column I +1, if I +1 The elements of the column are the same, continue to compare the

IOS KVC & KVOKey Value CodingKey Value Coding is a standard component of cocoa, which allows us to access the property by name (key) without having to invoke the explicit property accssor, as we have a property called Foo, We can get Foo to access

Replace syntax The syntax format of replace is: 1. replace into table_name (col_name,...) values (...) 2. replace into table_name (col_name,...) select... 3. replace into table_name set col_name = value ,... Algorithm Description: The replace

Mysql "on duplicate key update" SyntaxIf the on duplicate key update is specified at the end of the INSERT statement and the DUPLICATE value appears in a UNIQUE index or primary key after the row is inserted, UPDATE is executed ON the row with the

TWaver HTML5 has been released for some time, and the number of users has gradually increased. So I can't wait to apply for a trial version to write a small webpage. Recently, I am writing data query and table display functions. The table component

I. programming interfaces for databases in Windows:ODBC APIDaoOledbADOAdo. netODBC is a function interface.Dao, oledb, and ADO are COM components.Ado.net is a programming interface on the. NET platform.MFC provides ODBC and DAO Database Class

Recently, I want to see the JNI of Android and I don't want to switch back to Linux. So I have to choose windows + cygwin + ndk, When you start to install the cygwin environment, you generally do not know how to install it. Even after installation,

Anyone who has worked on projects in C # winform knows that the datagridview control only supports six types by default: datagridviewbuttoncolumn, datagridviewcheckboxcolumn, datagridviewcomboboxcolumn, datagridviewimagecolumn,

Question: There is a matrix (10*10). The element value can only be 0 or 1. Now, write a function to check whether a row is 1, and each column is 0 (except that this element of the row is 1 ). The program needs to scan the matrix once to obtain the

Several PHP interview questions 1. how can I use the php environment variable to get the content of a webpage address? How can I get the IP address? 2. calculate the difference between two dates, for example, 2007-2-5 ~ Date difference of-3-6 3.

. Net databases support MSSQLServer, but not other databases, but Microsoft pushes its own database products in support and marketing based on its own interests and needs. However, as a platform strategy, instead of rejecting other databases, he

# Region DataGrid related processing functions /// /// Obtain the Index value in the DataGrid Based on the name of the bound Column/// /// DataGridColumnCollection /// Field name of the binding column /// Int> 0 Index in the DataGrid,-1: Not

Dblookupcombox1 create a drop-down list in DBGrid1 The data in table a is used as the drop-down content (the background table), and table B is used as the destination table (and the table to be operated)   Component: query1 performance1 query2

Objective-C: KVC, KVO, and objective-ckvckvo 1. KVC (Key-Value encoding) Key Value Coding 1.1 in C #, the Object can be obtained through string reflection to read and write the Object attributes. Object-C has the same implementation, through the

When using the datagridview control, if you need a check box, you can use the datagridviewcheckboxcolumn. However, it is normal for general editing tasks, but if you want to use it for something more BT, some of them are not applicable. Here is an

1. Case subquery connection QueryCopy codeThe Code is as follows: select * from scoreCreate database demoUse demoCreate table [user]([UId] int identity (1, 1) primary key,[Name] varchar (50 ),[Level] int -- 1 ashes prawn cainiao)Insert into [user]