compare two columns in sql

. valid inputs include: COLUMN, CONSTRAINT, EVENT NOTIFICATION, INDEX, PARAMETER, TRIGGER, and NULL. [@level2name =] {' level2_object_name '} The name of the level 2 object type specified. level2_object_name is sysname, with a default of NULL."> The Level2_object_name data type is sysname and the default value is NULL. level2_object_name is sysname, with a default of NULL.">Example: level2_object_nam

PL/SQL converts rows and columns. In this blog post, we write a simple conversion of rows and columns. Here is a specific example. Some people have asked related questions on the Forum before. Many of the answers mentioned above are feasible. Of course, they think that they are very high-end, but they have no answer. Next, go to the topic. Www.2cto.com part1: col

Concatenate the values of multiple queried columns into a string bitsCN.com using SQL. Concatenate the values of multiple queried columns into a string using SQL. MySQL: [SQL] -- Concatenate a single column. first, locate a row, add a comma, and then splice the nex

Create a table scoresFirst, the traditional ranks of the transformationlongitudinal table to Horizontal tableThe horizontal table we're going to turn into is this:Since this table has only two columns, you can group by name. Put the name together first, and then we'll try to figure it out later.Select fromResults:Analysis: We get the score of the subject in Chinese first. Now that we've used the group by statement, there's a definite need fo

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

Label:can be applied to 2 different scenarios: 1. Clear all tables of data, after the data is emptied, it is best to be able to make the table identity column starting from 1 to count, so to reset the identity column's current value. 2. With replication, after the subscription synchronization data, the Subscriber data does not automatically grow, such as the self-increment ID of the 9527, but if the middle of the skipped ID, will automatically populate the missing passing ID, the execution of th

Sample Code for SQL Distributed Query and insertion of incremental columns. For more information, see. Sample Code for SQL Distributed Query and insertion of incremental columns. For more information, see. The Code is as follows: Truncate table TestTable EXEC sp_configure 'show advanced options', 1; -- enable adv

This blog post describes the simple conversion of rows and columns, which is provided in a specific example. Some people have asked related questions on the Forum before. Many of the answers mentioned above are feasible. Of course, they think that they are very high-end, but they have no answer. Next, go to the topic.Part1: column-to-row. Requirements: The following example shows a table: The table is defined as follows: create table TEST_TB_GRADE (

Tags: order export way blog. com Inpu Stroke Sele ResolutionWhen I export a flat file:Error 0xc00470d4:data Flow Task 1:the code page on Destination-3_txt. Inputs[flat File Destination Input]. Columns[userid] is 936 and was required to be 1252.(SQL Server Import and Export Wizard)Sometimes it can be verified through, sometimes not, what is the reason?I tried to use Unicode encoding (sometimes I can), not wi

Business requirementsRecently made a small tool for the company to bring data from one database (data source) into another (target database). The data required to import the target database cannot be duplicated. But the situation is that the data source itself has duplicate data. So you need to clear the data source data first.So we summarize the query and processing of the duplicate data. This is only a database-based solution. The implementation of the program is not considered.Environment is:

comparisons.Appendix, question type Ibid.:A syntax error occurs when SQL converts a varchar value to a column with a data type of int;The group table has a varchar field grouppower, with a value of 1,2,3,4, and an SQL statement forSELECT * FROM Dbo.function whereFunctionId in(Select Grouppower from Dbo.groupwhere groupid=1)A syntax error occurred while performing an error converting the varchar value ' 1,2

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 updated value Lotteryno Other SQL Introduction: The following

A colleague using the Informix database needs to use wildcards to search for the TEXT column. Although Informix supports wildcards in the LIKE and MATCH declarations, this does not include TEXT columns. The solution for outputting data to SQL Server obviously supports this search. To complete the search, my colleague must have Informix output useful data to a text file. Then, an

-- Add columns in the table cyclicallySet nocount on Declare @ barcode_head varchar (10)Declare @ SQL varchar (500) -- Declare a cursorDeclare business_cursor cursorSelect barcode_head from s_business order by ID Open business_cursorFetch next from business_cursor into @ barcode_head While @ fetch_status = 0BeginPrint @ barcode_headSet @ SQL = 'alter table dB

', ' undergraduate ' UNION ALL Select ' Two workshop ', ' King ', ' the ' specialty ' union ALL Select ' Two workshop ', ' Liu Yi ', ' Specialist ' select Unit, name, education from ( Select unit , name = (select top 1 name from tab where TA. unit = unit and TA. Education = education), education, s1=0,s2= Unit, s3=0 from tab TA Group by Unit, Education Union ALL SE Lect ' , Name, ', s1=0,s2= unit, s3=1 from tab TB where name Scenario Two: Select name into #temp from ( SELECT [Unit],max

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 of Tianjin, the rest for others, the target ef

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

/// /// Obtain the names of all database servers in the LAN. /// /// Server Name Array Public List String > Getsqlservernames () {datatable datasources =Sqlclientfactory. instance. createdatasourceenumerator (). getdatasources (); datacolumn Column = Datasources. Columns [ " InstanceName " ]; Datacolumn column2 = Datasources. Columns [ " Servername " ];

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

Aggregate functions such as SQL max can only perform n-row operations on the same column. If n-column operations are performed, the case statement is generally used for determination. If the number of columns is small, it is easier to write, if there are too many columns, it will be troublesome. --------------------------------------------------------------------