sql basics pdf

First, create a practice database;Create a student information sheet studentThe column names were:Code (INT)Name (varchar ()) NOT NULLBirth (varchar ()) NOT NULLSex (char ()) NOT NULLScoore (Decimal (18,2))Insert Information:Zhang San, John Doe, Harry, Zhao Liu, Feng Qi, Liu Ba1) All inquiries2) query a column (name)3) query multiple columns (name, gender, birthday)4) query one row according to the criteria (code=2)5) Find a data based on the criteria (the name of code 2)6) Find multiple data ac

SELECTOrderID, CustID, Empid, OrderDate, RequiredDate, ShippedDate, ShipperID, freight, ShipName, shipaddress, ShipCity, ShipRegion, Shippostalcode, ShipCountry fromsales.ordersWHERECustID= @cid;GOUse this function:SELECT OrderID, CustID from Dbo.fn_getcustorders (1 as CO;SummarizeTable expressions can simplify code, improve code maintainability, and encapsulate query logic. When you need to use table expressions, you use a derived table or a CTE if you do not plan to reuse their definitions,

Configuring the properties of a server is important for managing SQL Server. You can configure them in two ways. 1, with Enterprise Manager configuration When you right-click in Enterprise Manager and select the Properties option from the shortcut menu, the dialog box shown in Figure 5-13 appears, which allows you to set the server's properties. 2, with the Control Panel configuration The services shortcut under Administrative Tools (Administrat

------------------- -------------------2014-06-20 16:13:58 2014-06-16 16:13:581.2.2 How many hours, how many minutes, how many seconds, (2 hours, 2 minutes, 2 seconds)[Email protected]>select sysdate,sysdate+2/24,sysdate+2/24/60,sysdate+2/24/60/60 from dual;Sysdate sysdate+2/24 sysdate+2/24/60 SYSDATE+2/24/60/60------------------- ------------------- ------------------- -------------------2014-06-18 16:15:50 2014-06-18 18:15:50 2014-06-18 16:17:50 2014-06-18 16:15:52Note: Changes to the above ti

4th Zhang Ziyi (query4.2.1 Exist predicate: UseTSQLFundamentals2008Select * fromSales.customers asCwhereC.country=N'Spain'Select * fromSales.customers asCwhereC.country=N'Spain' and exists(Select * fromSales.orders asOwhereO.custid=C.custid)Select * fromSales.customers asCwhereC.country=N'Spain' and not exists(Select * fromSales.orders asOwhereO.custid=C.custid)View Code4.3.2 Continuous Gathering andSelect object_id('Sales.ordertotalsbyyear')if object_id('Sales.ordertotalsbyyear') is no

7.6.1 removed with Enterprise Manager When you right-click the table you want to delete from the Enterprise Manager, select the Delete (delete) option from the shortcut menu, the Delete Object dialog box appears as shown in Figure 7-9, and you can delete the table by clicking the Drop All button. When you click the Show Dependencies button, a dialog box appears as shown in Figure 7-10. It lists the objects that the table relies on and the objects that are dependent on the table. You cannot dele

Books Online logical operators and physical operator references Refer to the book SQL. server.2005. Technical Insider "series Conclusion This article mainly introduces some of the methods of index operation, mainly describes the way we usually apply when writing statements, and to cite a few examples, as a point, in fact, we usually write in the statement is nothing more than this article introduced in the various ways of change, patchwork.

Original: SQL Server Tuning Series Basics (Index operations Summary)ObjectivePrevious articles we introduced how to view the query plan, the introduction of common operators, the way of parallel operations, interested can click to view.This article will analyze in SQL Server, how to use the first indexed items for query performance optimization, by understanding

Oracle|sql language []oracle pl/sql Language Foundation Oracle Pl/sql Language Basics Pl/sql is Oracle's extension of the standard database language, Oracle has integrated PL/SQL into Oracle servers and other tools, and more dev

Tags: delete tail let beyond produce modify destroy product ALTStairway to T-sql:beyond the Basics level 9:dynamic T-SQL Codeby Gregory Larsen, 2016/07/29 (first published:2014/07/23) Original link: http://www.sqlservercentral.com/articles/Stairway+Series/113118/The SeriesThis article is part of the series: the Ladder to T-sql: Beyond the

attention, on the SQL Server performance tuning of the content is very broad, followed by the analysis in the article.If you have any questions, you can leave a message or private messages, and look forward to an in-depth study of your child's shoes with SQL Server. Learn together and progress together.At the end of the article to give a few links, it seems necessary to sort out a catalogue .....

Original: SQL Server Tuning Series basics (Parallel operations Summary chapter II)ObjectiveIn the previous article we described how to view the parallel running of a query plan.In this article we then analyze the parallel operations of SQL Server.Gossip less, directly into the topic of this article.Technical preparationAs in the previous few, the

ProductName OrderDate 1 Computer 2008-12-26 2 Printer 2008-12-26 3 Electrograph 2008-11-12 4 Telephone 2008-10-19 Now, we want to select a record from the table above that OrderDate is "2008-12-26".We use the following SELECT statement:SELECT * from Orders WHERE orderdate= ' 2008-12-26 'Result set: OrderId ProductName OrderDate 1

the Orders table that are placed by the specified customer within the specified date range, and also takes the behavior affected by the query as an output parameter.View Code Tips: Stored procedures can encapsulate business logic processing, better control security (to help avoid SQL injection), and improve execution performance (reduce network traffic). (3) Trigger: A special stored procedure that, whenever a particular event occurs,

Original: SQL Server Tuning Series Basics (Summary of common operators)ObjectiveIn the previous article we looked at how to view the query plan, this article will introduce the analysis techniques in the query plan we looked at, as well as several of our commonly used operator optimization techniques, the same emphasis on the master of basic knowledge.In this article, we can understand how we normally write

Label:Original: SQL Server Tuning Series Basics (Summary of common operators)ObjectiveIn the previous article we looked at how to view the query plan, this article will introduce the analysis techniques in the query plan we looked at, as well as several of our commonly used operator optimization techniques, the same emphasis on the master of basic knowledge.In this article, we can understand how we normally

Label:Original: SQL Server Tuning Series Basics (Union operator summary)ObjectiveIn the last two articles, we describe how to view the query plan, and some of the common optimization techniques for join operators, and we summarize how the federated operators are used and how to optimize them.Talk less and go straight to the subject of this article.Technical preparationBased on the

UNIQUE constraint in the "id_p" column when the "Persons" table is created: Mysql: CREATE TABLE Persons ( id_p int not NULL, LastName varchar (255) is not NULL, FirstName varchar (255), Address varchar (255), City varchar (255),UNIQUE (Id_P)) Mysql/sol Server/oracle/ms Access: CREATE TABLE Persons ( UNIQUE , LastName varchar (255) Not NULL, FirstName varchar (255), Address varchar (255), City varchar (255) ) If you need to name a unique constraint and

Basics of T-sql: Beyond basic Level 6: Using case expressions and IIF functionsGregory larsen,2016/04/20 (First edition: 2014/04/09)The seriesThis article is part of "Stairway series: The cornerstone of T-sql: Beyond the Basics"From his stairway to T-SQL DML, Gregory Larsen

ConclusionThis article first to this bar, short, easy to understand, this article mainly introduces the query plan of the joint operators, the next we analyze SQL Server parallel operations, in multicore hyper-threading gathered today, see SQL How server uses parallel operations to maximize the use of existing hardware resources to improve performance, is interested in advance attention, the content o