SQL Server

Begin SQL Server views Posted by Scott on November 28, 2004 An RDBMS uses a view to create a virtual table. The careful use the views can improve the interaction between a. NET application and the underlying data. In this article we'll discuss views

Source: Tomorrow go begging ' s Blog The previous time in testing more than 1 million data paging speed, need to insert 1 million records into the database, at that time inserted record I was written in C #, and later found that, in fact, with the

Recently, in order to be able to run other applications in the database server, the database server has been upgraded on a soft and hardware basis without changing the database operating system version. On the software, upgrade the operating system

SQL Server database Tutorial connection Error Resolution method Error provides "An error occurred while retrieving the user's local application data path, resulting in the inability to generate a user instance of SQL Server. Make sure that the

DECLARE @CurrentDate datetime=getdate ();SelectDATEADD (dd,0, DATEDIFF (dd,0, @CurrentDate)) as current date,DATEADD (Dd,-1, DATEDIFF (dd,0, @CurrentDate)) as yesterday,DATEADD (Mm,datediff (mm,0, @CurrentDate), 0) as the first day of this

Causes of blockage formationBecause SQL Server is high concurrency, there will be a lot of user access at the same time, in order to ensure data consistency and data security, the introduction of a lock mechanism. At the same time only the user who

Convert table 1 to table 2:Table 1Table 2To get the results of table 2, you need to go through several pivot transformations, and then join together by union, the code is as follows:1 SelectID, type,sum([1])[1],sum([2])[2],sum([3])[3],sum([4])[4]

Use Navicat Premium to export SQLServer data to the SQL format, navicatsqlserver In fact, it is very easy to export MSSQL database data to. SQL format files. Microsoft SQL Server 2008 already has this function. For details, refer to this article.

Explain SQL Server simple query statements and SQL Server statements Preface I have spent a lot of time studying a large number of articles in some theoretical articles, especially the index, understanding the indexing principles will be of great

SQL sets the maximum number of connections and query statements of SQL Server. 1. Set the maximum number of connections The following T-SQL statements configure the maximum number of concurrent user connections allowed by SQL Server. exec

SQL Server simple query example summary, SQL Server example summary Preface This section describes some examples of simple query statements, as well as some notes, brief content, and in-depth understanding. EOMONTH In the Tutorial example of SQL

SQL multi-condition query implementation methods SQL multi-condition Query In the future, we will perform multi-condition queries. One is arrangement and combination, and the other is dynamic concatenation of SQL statements. For example, we need

Description and difference between SQL where and jion on conditions, wherejion Differences between the where and jion on conditions in SQL statements There is a big difference. Please note! SELECT region, TBL_StockMaterial.SalePrice FROM

SQL Server Substring function usage instance parsing, serversubstring The substring function in SQL is used to capture part of a column. The function names are not exactly the same in different databases: MySQL: SUBSTR (), SUBSTRING () Oracle:

SQL statement usage and multi-Table query, 1. SQL statement for formatting time In this example, I made two tables randomly, which is not very consistent with the actual situation. I just want to explain how to write the SQL statement. Example

Difference between having and where in Database SQL, sqlhaving "Where" is a constraint Declaration, Where is used to constrain the data in the database. Where is used before the result is returned, and Where cannot use aggregate functions. "Having"

The code is as follows:Copy code Use tempdbGoIf object_id ('Table _ left') is not null drop table table_leftIf object_id ('Table _ right') is not null drop table table_rightGoCreate table table_left (groupId nvarchar (5), dataSub1 nvarchar (10),

There are several constraints:Not null: the content used to control fields must NOT be NULL ).UNIQUE: The control field content cannot be repeated. A table can have multiple Unique constraints.Primary key: it is also used to control the content of

Let's look at the vocabulary method first The code is as follows:Copy code CONVERT (data_type (length), data_to_be_converted, style) Example 1 The code is as follows:Copy code Select convert (varchar (30), getdate (), 101) now Result:Now---

Maintenance plan1. Create a maintenance plan, name it 'DB _ bak', and select the 'backup database' task from the toolbar,2. Select the database, Expiration Time, and backup directory on the properties page. Here I select a partition on the network