sql update multiple columns

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MyBatis Batch update update-set multiple field values

MyBatis is recognized and used by everyone because of its simplicity and ease of use. But in the batch update operation, the online introduction of seemingly incomplete, just do a record today, we progress together In the actual project development process, there is often such a requirement: According to the IDs update the table of a field value, the SQL statemen

Share multiple table join methods to update multiple different records at the same time

The following is a test example.1. Create two temporary tables and input test data:Copy codeThe Code is as follows:Create table # temptest1(Id int,Name1 varchar (50 ),Age int)Create table # temptest2(Id int,Name1 varchar (50 ),Age int) The following table data is queried: # Temptest1 # temptest2 2. Now we need to update the age in # temptest2 to the corresponding age in # temptest1. In fact, the age of ID 1 in [Table 1] is changed to 19, and the ag

Common SQL commands @ oracle Data Type summary @ permissions, roles, User Creation and use @ pseudo columns and precautions

name/Password switch users; for example, conn scott/tiger. Note: No semicolon ends during logon. 3) tables in oracle are user-defined sys Super Users (with the highest permissions) system Database Administrators (who perform most management operations) to test users. 3. common oracle commands and knowledge point commonly used commands: select * from tabs: queries the tables of the current user (multiple queries to the system table); select table_name

Simple and useful SQL scripts (transpose columns and querying the same records in a table)

The SQL scripts recommended in this article are all very practical. I learned how to study them together. The SQL scripts recommended in this article are all very practical. I learned how to study them together. Exchange of rows and columns The Code is as follows: Create table test (id int, name varchar (20), quarter int, profile int) Insert into test values (1,

Multiple table associations update multiple different records at the same time

Because the project requires that multiple different records be updated at the same time, we have discussed a good solution with our colleagues. The following is a test example. 1. Create two temporary tables and input test data:View code 1 create table #temptest1 2 ( 3 id int, 4 name1 varchar(50), 5 age int 6 ) 7 8 create table #temptest2 9 (10 id int,11 name1 varchar(50),12 age int13 ) The following table data is queried:

Simple and useful SQL scripts (transpose columns and querying the same records in a table)

Exchange of rows and columns CopyCode The Code is as follows: Create Table Test (ID int, name varchar (20), quarter int, profile INT) Insert into test values (1, 'A', 1,1000) Insert into test values (1, 'A', 2,2000) Insert into test values (1, 'A', 3,4000) Insert into test values (1, 'A', 4,5000) Insert into test values (2, 'B', 1,3000) Insert into test values (2, 'B', 2,3500) Insert into test values (2, 'B', 3,4200) Insert into test values (2, 'B',

6 ways to convert SQL rows and columns

30 women 7902 FORD ANALYST 7566 1981/12/3 3000.00 20 female 7934 MILLER Clerk 7782 1982/1/23 1300.00 10 male Rows selected Second, row and column conversion methodRequirements: Check the total salary for different positions in each department.1, the most traditional SQL solution is as follows: Sql> Select D.dname, E.job, sum (SAL) as Sum_sal2 from EMP E, Dept D3 Where E.dep

Simple and useful SQL scripts (transpose columns and querying the same records in a table)

Exchange of rows and columnsCopy codeThe Code is as follows:Create table test (id int, name varchar (20), quarter int, profile int)Insert into test values (1, 'A', 1,1000)Insert into test values (1, 'A', 2,2000)Insert into test values (1, 'A', 3,4000)Insert into test values (1, 'A', 4,5000)Insert into test values (2, 'B', 1,3000)Insert into test values (2, 'B', 2,3500)Insert into test values (2, 'B', 3,4200)Insert into test values (2, 'B', 4,5500)Select * from test-- Row-to-column ConversionSele

How to represent calculated columns (LINQ to SQL)

Http://u.115.com/file/f23bcc71be demo Demonstration highlightsAdd the expression attribute to the columnattribute attribute of the object class column member,Then, it indicates the computed columns corresponding to the data table.This attribute is of the string type,The value assigned to this attribute is the expression of the computed column in the data table.For example, expression = "[unitprice] * [unitsinstock]"By default, the O/R designer does no

SQL stitching 2 unrelated tables into 2 columns for batch updates to another table

bulk update, make an internal connection, update the condition table by updating the primary Table So_master Table Association T1, and then T2 get the updated value, T1 and update the main table So_master through the Foreign Key Association, T2 is T1 according to the T2 Ordinal Association, and then add all the query criteria , The main is the column with the up

SQL Application and Development: (5) connecting multiple data tables and multiple SQL tables

SQL Application and Development: (5) connecting multiple data tables and multiple SQL tables Different tables in the database store different data. Users often need to use the data in multiple tables to combine and extract the required information. If a query needs to operat

Sorting of guid columns and Cluster Index in SQL Server

Today, I investigated a defect in the project and found that SQL Server sorts the guid column andClusterSpecial processing of index. Two knowledge points are involved. One is how SQL Server sorts guid columns.AlgorithmImplementation. The second is the difference between cluster index and noncluster index. First, let's talk about how SQL Server sorts the guid

Re-arrange the ID columns of SQL Server

SQL Server IDs are often used to increase by itself, that is, the identification column to act as the primary key of a table. There are two concepts to be clarified: 1. ID column: it can be created using the identity attribute so that application developers can specify the identity number (identity seed attribute) in the first row inserted to the table ), determine the increment (identity increment attribute) to be added to the seed to determine

SQL Server One or more columns of duplicate data queries, deleting

in (the SELECT MIN (ID) from dbo. Member GROUP by Name)Execution Result:Explanation: The above example only holds the minimum value for the respective name.Second, the use of DISTINCTWarm reminder:Multi-column statistics not supportedOracle and DB2 databases are also availableUse the DISTINCT keyword to return a unique different value(1) Querying a column for non-repeating dataStatement: SELECT DISTINCT Name from dbo. MemberResult set:(2) DISTINCT query mu

SQL 2008 Split columns by condition

in the process of reporting to the Personnel Bureau, a difficult problem was encountered, and the customer requested that a column of data in the database be divided into multiple columns according to the conditions. For example, there are provinces in the database that have such a column of dataCustomer requirements according to the province classification, Hebei province a column, Beijing City, a column o

SQL: insert all other columns of rows with the same primary key updated.

SQL: insert all other columns of rows with the same primary key updated. In SQL writing, we often encounter such problems. During each insert operation, you must determine whether the data table already exists. For the same data, all the columns except the primary key are the same. If no data exists, the data is inser

Oracle\ms SQL Server Update Multi-Table Association update

Original: Oracle\ms SQL Server Update Multiple Table association updateA single update UPDATE statement is not able to update multiple tables unless you use triggers to suppress updates

SQL Server deletes data columns

Delete data columnsThe data columns that are built, wrong, or duplicated in the development or production process need to be deleted.Use the SSMS database management tool to delete data column mode one1. Open database--Select data Table-"Expand Data Sheet-" Expand Data Column-"Select the data column to delete-" Right click-"SELECT Delete-" in the Pop-up box click OK.Way Two1. Open Database-"Open data Sheet-" Right click-"SELECT Design.2, in the Design

In the same SQL table, PHP queries the sum of two data columns and then outputs

: This article mainly introduces the SQL statement for the same table. PHP queries the sum of two columns of data and then outputs the results. if you are interested in the PHP Tutorial, you can refer to it. // Calculate the total order quantity $query_num = "SELECT SUM(order_num) from hcf_order_db where order_id = XXX";$arr_qn = mysqli_query($dbc,$query_num);list($sum)=mysqli_fetch_row($arr_qn); // Calcul

Simple and useful SQL scripts (rows and columns, querying a table for the same record, etc.) _mssql2005

replacement string substring replace Copy Code code as follows: --Example 1: Update Tbpersonalinfo Set truename = replace (truename,substring (truename,2,4), ' * * ') where ID = 1 --Example 2: Update Tbpersonalinfo Set Mobile = replace (mobile,substring (mobile,4,11), ' ******** ') where ID = 1 --Example 3: Update Tbpersonalinfo Set Ema

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