how to update multiple rows in sql

Captain Classmate's original address: https://www.cnblogs.com/teamleader/archive/2007/05/31/765943.htmlCaptain Classmate's original description:Sometimes we need to execute multiple SQL statements at once, and the SQL used to update them is spelled out according to the actual code.The solution is to put

. Especially in complex queries or large table queries, the user can obviously feel slower speed. --------------------------------------------------------- Problem, execute a piece of code back to a string that is going to execute my multiple SQL statements. How to get it through Oracle. Think about it. Dynamic Sql,execute IMMEDIATE This is a syntax for parsing a

After reading the article, it is very enlightening that MySQL is usually the first select when it is update, and at this point, if the index is not used, it will lock the entire table. The best use of indexesBy using the primary key, if we know the scope of the primary key (as long as it is a superset of the exact range), you can add the scope of the primary key in the query condition so that the queryBy using the primary key index, you can increase t

Tags: group_concat for XML ParhMultiple lines of MySQL and SQL Server merged into one lineMySQL Multi-line merge:MySQL built-in function group_concat (exper SEPARATOR "")Exper: set forthSEPARATOR "": line delimiter, which means separating multiple lines with a spaceMysql> select * from tmp_02;+------------+---------+| fclient | CT |+------------+---------+| Android | 1858799 || IOS | 522568 || Legendary Cli

Tags: str insert third party response view from pop create definitionOverview: As a DBA, it is often necessary to update the official database with the SQL script provided by the developer, but a more reasonable development process, when the script is submitted to the DBA, there may already be hundreds of SQL files, and there is a sequence of execution, such as t

Unknown originOverview:As a DBA, it is often necessary to update the official database with the SQL script provided by the developer, but a more reasonable development process, when the script is submitted to the DBA, there may already be hundreds of SQL files, and there is a sequence of execution, such as the company I am working on, more than 10 customers, one

Label:1. Query the MySQL statement as needed, return three required parameters, not a dataset 2. Write the function as follows: public static void Getparas (string condition 1, out string return value 1, out string return value 2, out string return value 3){The return value is 1= string. Empty;The return value is 2= string. Empty;The return value is 3= string. Empty; String strSQL = String. Format ("SELECT * from table where field 1= ' {0} ' limit 1", condition 1); Execute

Transferred from: http://blog.csdn.net/huanghanqian/article/details/52847835The difference between the four joins is commonplace: INNER join (can also be abbreviated as JOIN): Returns a row if there is at least one match in the table Left JOIN: Returns all rows from the table, even if there is no match in the right table Right JOIN: Returns all rows from the correct table even if there is n

SQL Server destination objects.The SQL script I used is:Create DatabaseTestGo UseTestGo--ran for each SSIS test run--SSIS data type for each column is "Eight-byte signed integer [Dt_i8]"Drop TableTestfastparseCreate TableTestfastparse (C1bigint, C2bigint, C3bigint, C4bigint)Go--Insert data using OPENROWSETCreate TableTestopenrowset (C1bigint, C2bigint, C3bigint, C4bigint)GoDBCCdropcleanbuffersDeclare @star

Problem: execute a piece of code to reverse a string, which is to execute multiple SQL statements. How to make it pass in Oracle. I want to think about dynamic SQL. execute immediate is a syntax for parsing and Executing standard SQL statements. You only need to format the statement to be executed in this string. For e

SQL Server UPDATE statement is used to update data, the following is a detailed description of the syntax aspects of SQL Server update statements, hoping to give you a better understanding of SQL Server

Moutai e-commerce has multiple SQL Injection packages in the background (DBA permission/17 databases/47W members) Note:Http://www.emaotai.cn: 90/zyd/ Account: wangleiPassword 123456Get submit method SQL injection point:Http://www.emaotai.cn: 90/zyd/Sales/XsdEdit. aspx? Pjbh = 111000100020 ReturnPage = Xsmxz. aspx op = 2 http://www.emaotai.cn:90/zyd/Sales/Xsmxz.

Sometimes we need to execute multiple SQL statements at a time, and the SQL statements used for updating are used according to the actual situation.CodeSpelled out The solution is to splice the SQL statement into the following form: BeginUpdate tb_vg set seq = 1, vessel_id = 'jin14', vessel_type = 'track' where batch

Label:MySQL multiple table insert:INSERT into SELECT from GROUP by goods_cate; -- INSERT into table name (column name) query corresponding columnMS SQL Multi-table insert:Same as MySQL.MySQL Multi-Table Association updateUPDATE INNER JOIN on = SET = cate_id -- UPDATE Table Name Association statement SET Specific Change fieldMulti-Table Association

Tag: des io os ar for SP data on issueDelphi (Pascal) codeVarsqlstr:string;Beginsqlstr:= ' Begin 'sqlstr:= sqlstr+ ' Update table1 set col1 = ' Test ' where 1=2; ';sqlstr:= sqlstr+ ' Update table1 set col1 = ' test2 ' where 1=2; ';sqlstr:= sqlstr+ ' End ';Adoquery1. Close;Adoquery1. Sql. Clear;Adoquery1. Sql. ADD (SQLS

Asp.net c # import excel to the mssql SQL database and support multiple sheet tables Asp tutorial. net c # import excel to mssql SQL database tutorial and support multiple sheet tables'Solution 1: ObjSheet = (Excel. _ Worksheet) objSheets. get_Item (Sheets ); 'Instance code For (int I = 0; I { For (int j = 0; j

Tags: Oracle SQL ProgrammingIamlaosongWhen you update multiple fields in a table normally, the fields are written separately, for example:Update Tb_county t set t.prov_name = ' Anhui ', t.city_name = ' Hefei ', t.xs_mc = ' Luyang District ' where T.xs_code = ' 2300 ';However, if the updated value comes from a subquery, these fields can be written together, for

Multiple SQL tables query and computing statistics code based on ACCESS and ASP, accesssql Recently, I am writing a few management systems about "Project-Subitem-Task", saying that the system is a bit exaggerated. It is basically a multi-Table query call and database operations of insert and update, the SQL statements

1. Multi-Table Query1) Descartes Set: SELECT * FROM table name 1, table name 2 SELECT * FROM table name 1, table name 2 where table name 1. field name = Table Name 2. Field Name Note: If there are two fields with the same name, the table name (alias) will be used. Order BY is placed after the where condition. 2) Self-connection: The connection query for the same table, which treats a table as two tables or multiple

SQL Multiple primary key tables, when the inserted data is duplicated, are prompted to violate the primary KEY constraint that cannot be inserted by the error. So, how do I find duplicate values for the inserted data? Workaround: Use Group bySuppose there is a table #a , there are saleid,vendorid,comid,price,saleprice,quantity and other fields. The primary key is: Saleid,vendorid,comid three of them. Assu