how to update multiple rows in sql

Web front-End code:IdTitleSmallclassnameAuthorUpdateTimeCS Page Code:Using System;Using System.Collections.Generic;Using System.Linq;Using System.Web;Using System.Web.UI;Using System.Web.UI.WebControls;public partial class BatchAdd:System.Web.UI.Page{protected void Page_Load (object sender, EventArgs e){if (!string. IsNullOrEmpty (request["Hidnum")){int num = Convert.ToInt32 (request["Hidnum"]);String ID, title, smallclassname, author, updatetime;int rs = 0;if (num > 0){for (int i = 0; I {id = r

To update multiple rows: There are many steps, but the efficiency is relatively high:1. Create Table temporary table value (select a. ID, A. Name, B. Name,... from Table1 A, Table2 B where a. ID = B. ID)2. delete records in Table 1. Do not drop3. insert into Table1 select the field you need from the temporary table. Select * From tb_ai03 Create Table tb_ai

Label:---restore content starts---[This afternoon to accept an emergency small task, is a set of record statistics, the chess game player's two records in a row of the display, into the database after the first thought is the row to the column, but at the beginning felt wrong, and later wrote half really wrong, later on the Internet query for half a day more than a row of rows and more columns, Found to write algorithms and write functions, see the re

Tags: english sep chinese img Parallel src segmentation Math Group BYDatabase structure And I want to make the same person's different grades into this person. displayed on different columns of this line, this time divided into 2 shows: The first shows----"Multiple rows to one column" (the merged data is on the same column): SQL is as follows: The second show

Usage scenarios:For example, you need to query all student numbers with scores greater than 95, separated by commas into a string, from the Student score table.To prepare the test data:CREATE TABLE score (ID int,score int)INSERT into score values (1,90)INSERT into score values (2,96)INSERT into score values (3,99)It is now necessary to query the result string "2,,3" with a single statement.The SQL Server statements are as follows:Select substring ((SE

Example of a trigger codes: Code of the insert, delete, and update trigger: Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->-- DBO. trgroups. SQL If exists ( Select * From sysobjects where Name = 'trgroups' and type = 'tr ') Begin Drop trigger trgroups If not exists ( Select * From sysobjects where Name = 'trgroups' and type = 'tr ') Print 'drop trgroups s

(8000) Select @sql =isnull (@sql + ' union All ', ') + ' select name, [Course]= ' +quotename (name, ' "') + ', [score] = ' +quotename (name) + ' fro M TB ' from syscolumns WHERE name!= ' name ' and id=object_id (' TB ')--table name TB, not including other columns named name ORDER by Colid exec ( @sql + ' ORDER by name ') go 3. Using

Label:1. Get the last bar to insert dataLAST_INSERT_ID ();2. Gets the number of update impact rows.Row_count ();mysql> UPDATE T , SET address = ' beijing111 ' , WHERE id = 1 , and NAME = ' Yubowei '; query OK, 1 row affected (0.30 sec) Rows matched:1 changed:1 warnings:0 mysql> C14/>mysql> SELECT Row_count (); +-------------+ | Row

Sometimes in some systems, we need to use SQL statements to display data in one-to-multiple Relational Tables in the form of a row of each record. This article uses functions and cursors to implement this function. The example table is described as follows: A user table and document table Now you want to implement the following functions to query the synthesis of each user and the corresponding document na

To Merge multiple rows into one project, you must merge multiple rows into one project. The table structure is as follows: Name null type -------------------------------------- N_sec_code not null char (6) C_researcher_code not null varchar2 (20) This table stores the ing data between "stock" and "researcher". Gener

Document directory Example Stuff: For xml path References Example Yesterday I encountered an SQL Server problem: I need to write a stored procedure to process data in several tables. The problem is that I want to splice multiple rows in one column of a table into one row, for example, a table has two columns of data: Category Name A

To Merge multiple rows into one project, you must merge multiple rows into one project. The table structure is as follows: NAME Null Type ----------------------- ----- N_SEC_CODE not null char (6) C_RESEARCHER_CODE not null VARCHAR2 (20) This table stores the ing data between "stock" and "researcher, generally, for the

Problems that occur when you update a table that does not have a primary key set:Cause of the problem:Most of this is due to the absence of a primary key (PK) that causes several identical data to exist in the same tableWhen the DBMS is stored, only one piece of data is stored, because the DBMS is optimized to reduce data redundancy. So deleting or updating a duplicate data is reachingWorkaround:It is recommended to set the primary key to check for th