SQL Server

1. Table StructureId type productCode1 pencil 00012 pencil 00023 pencil 00034 pen 00045 pen 00056 pen 00047 ballpoint pen 00078 ballpoint pen 00089 ballpoint pen 00072. Custom function funCopy codeThe Code is as follows:GO/***** Object:

Copy codeThe Code is as follows:Select to_char (date_published, 'yyymmm ') yo from blog group by yo;Convert to sqlalchemy statement You can use extract ()Copy codeThe Code is as follows:In [3]: year_field = db. func. extract ('Year', ArticleModel.

I. Overview SQL Server provides backup and recovery methods for "detach/Attach" databases, "backup/restore" databases, and duplicate databases. This section describes a commonly used "separation/attachment" Method for learning, similar to the

1 student table studentS # student ID, sname name, difdate date, class grade2 course schedule courseC # course No., name: cname3 transcript scoreS # student ID c # course number score-- 1 count the number of persons in each classSelect grade, count (

Since executing the cursor is equivalent to executing the SELECT statement, the efficiency is not flattering and has not been studied in depth.Copy codeThe Code is as follows:The table1 structure is as follows:Id intName varchar (50)Declare @ id

I didn't talk about the stored procedure in the university. After working for a period of time, I still didn't use the stored procedure. I don't need to write the stored procedure at all. Maybe it's the reason for developing the software. For future

Introduction to PowerDesigner Purpose of the tool: Here I will only introduce his application in the SqlServer database, and I do not understand other applications. Benefits of the tool:My personal understanding, graphic-based database design, more

Start: -------------------------------------------------------------------------------- Last week, the customer reported a system problem. when processing a large amount of data, the network timed out. Later, we tracked and tested the network

The SQL Server database uses the DATALENGTH function to obtain the content length of the TEXT field. Next, let's take a look at this part through the syntax of the DATALENGTH function and the example. DATALENGTH is used to return the number of

1. subquery Concept(1) the judgment in the where clause of the query is based on the results of another query. This constitutes an external query and an internal query. This internal query is a self-query.(2) Self-query category1) Independent

This article draws on the great gods in the garden and I just want to make some modifications. If there is something bad, please try again.First write the Implementation ideas and then paste the code 1. Create a stored procedure, declare the output

Copy codeThe Code is as follows:--- Remove the number of repeated values in the stringCreate function StringRemove (@ str nvarchar (2000 ))Returns varchar (2000)AsBeginDeclare @ result nvarchar (2000), @ temp nvarchar (1000)Set @ result =''Set @

Misunderstanding #29: You can build clustered indexes for the heap and DROP the indexes before performing fragment on the heap.Nooooooooooooo !!! Building a clustered index on the heap and dropping it again seems to me to be the second thing except

I. Requirements Because of poor expression ability, direct. In the mssql environment, you need to convert the table in figure 1 to the table in Figure 2: Figure 1 Figure 2 Ii. Analysis 　　 Figure 3 2.1 create a table Copy codeThe Code is as follows:

Copy codeThe Code is as follows:--- 1. average sales wait time--- There is a Sales table with two columns: Sales date and customer. a SQL statement is required for calculation.-- Average number of days between two purchases by each customer-- Assume

SQL server Stored Procedure syntaxDefinition is always abstract. The stored procedure is actually a set of SQL statements that can complete certain operations, but these statements are stored in the database (Here we only talk about SQL Server ). If

1,CaseSubquery connection QueryCopy codeThe Code is as follows:Select * from scoreCreate database demoUse demoCreate table [user]([UId] int identity (1, 1) primary key,[Name] varchar (50 ),[Level] int -- 1 ashes prawn cainiao)Insert into [user]

Copy codeThe Code is as follows:SET ANSI_NULLS ONGOSET QUOTED_IDENTIFIER ONGOCREATE function [dbo]. [SplitString](@ Input nvarchar (max ),@ Separator nvarchar (max) = ',',@ RemoveEmptyEntries bit = 1)Returns @ TABLE table([Id] int identity (1, 1

Misunderstanding #11: The image can be transferred immediately after the fault is detected ErrorDatabase image failover can be initiated automatically or manually. In the case of automatic initiation, the mirror server performs the failover

Through understanding and summarizing SQL Server database backup and restoration (I), I believe you have a deeper understanding of data backup and restoration, I did not analyze the transaction logs in the above article. Here I recommend song