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Querying Microsoft SQL Server 2012

Querying Microsoft SQL Server 2012. Brian Alderman | MCT, CEO / Founder of MicroTechPoint Tobias Ternstrom | Microsoft SQL Server Program Manager. Meet Brian Alderman | ‏ @ brianalderman. MCT, Chief Executive Office, Founder MicroTechPoint Industry-recognized consultant

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Querying Microsoft SQL Server 2012

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  1. Querying Microsoft SQL Server 2012 Brian Alderman | MCT, CEO / Founder of MicroTechPoint Tobias Ternstrom | Microsoft SQL Server Program Manager

  2. Meet Brian Alderman | ‏@brianalderman • MCT, Chief Executive Office, Founder MicroTechPoint • Industry-recognized consultant • Noted author and conference speaker • Brian’s expertise and designs range across Microsoft operating systems • More than 25 years of industry experience • Brian has been focused on helping IT Pros and Database Administrators (DBAs) better understand core Microsoft technologies for over 25 years. • A frequent presenter at SharePoint Conferences around the world, he has authored or contributed to several SharePoint, SQL Server, and other technical books, and is a MCSE, MCT, and MCITP: SharePoint and SQL Server Administrator. • Brian has a BS and MS in Computer Information Systems where he graduated summa cum laude from Regis University of Colorado Springs and lives in Scottsdale, AZ where he enjoys playing golf year round and traveling around the world.

  3. Meet Tobias Ternstrom • Principal Program Manager Lead in the SQL Server & Windows Azure SQL DB product group • His team owns the development of the T-SQL language, type-system and server-side libraries and performance management in SQLDB • Tobias describes himself as a developer, instructor and architect who has been using SQL Server since mid-90s

  4. Setting Expectations Level 300 - Individuals seeking to learn the technical skills required to write Transact-SQL queries for Microsoft SQL Server 2012 Prerequisites - Working knowledge of relational databases. Understanding of SQL Server Management Studio. Basic knowledge of the Microsoft Windows operating system and its core functionality.

  5. Course Topics

  6. Course Topics

  7. 01 | Introduction to Microsoft SQL Server 2012 Brian Alderman | MCT, CEO / Founder of MicroTechPoint Tobias Ternstrom | Microsoft SQL Server Program Manager

  8. Course Topics

  9. Types of commands and statement elements Basic SELECT statements Module Overview

  10. Commands and Statement Elements

  11. Categories of T-SQL statements Data Manipulation Language (DML*) Data Definition Language (DDL) Data Control Language (DCL) • Statements for querying and modifying data • SELECT, INSERT, UPDATE, DELETE • Statements for security permissions • GRANT, REVOKE, DENY • Statements for object definitions • CREATE, ALTER, DROP * DML with SELECT is the primary focus of this course

  12. T-SQL language elements Batch Separators Functions Predicates and Operators Variables Comments Control of Flow Expressions

  13. T-SQL language elements: predicates and operators T-SQL enforces operator precedence

  14. T-SQL language elements: functions String Functions Date and Time Functions Aggregate Functions • SUBSTRING • LEFT, RIGHT • LEN • DATALENGTH • REPLACE • REPLICATE • UPPER, LOWER • RTRIM, LTRIM • SUM • MIN • MAX • AVG • COUNT • GETDATE • SYSTDATETIME • GETUTCDATE • DATEADD • DATEDIFF • YEAR • MONTH • DAY

  15. T-SQL language elements: variables • Local variables in T-SQL temporarily store a value of a specific data type • Name begins with single @ sign • @@ reserved for system functions • Assigned a data type • Must be declared and used within the same batch • In SQL Server 2008 and later, can declare and initialize in the same statement DECLARE @MyVar int= 30;

  16. T-SQL language elements: expressions • Combination of identifiers, values, and operators evaluated to obtain a single result • Can be used in SELECT statements • SELECT clause • WHERE clause • Can be single constant, single-valued function, or variable • Can be combined if expressions have same the data type SELECTYEAR(OrderDate)+1 ... SELECTOrderQty*UnitPrice ...

  17. T-SQL language elements: batch separators • Batches are sets of commands sent to SQL Server as a unit • Batches determine variable scope, name resolution • To separate statements into batches, use a separator: • SQL Server tools use the GO keyword • GO is not a SQL Server T-SQL command

  18. T-SQL language elements: control of flow, errors, and transactions • Allow you to control the flow of execution within code, handle errors, and maintain transactions • Used in programmatic code objects • Stored procedures, triggers, statement blocks Control of Flow Error Handling Transaction Control • TRY...CATCH • BEGIN TRANSACTION • COMMIT TRANSACTION • ROLLBACK TRANSACTION • IF...ELSE • WHILE • BREAK • CONTINUE • BEGIN...END

  19. T-SQL language elements: comments • Marks T-SQL code as a comment: • For a block, enclose it between /* and */ characters • For inline text, precede the comments with -- • T-SQL Editors such as SSMS will typically color-code comments, as shown above /* This is a block of commented code */ -- This line of text will be ignored

  20. Logical query processing • The order in which a query is written is not the order in which it is evaluated by SQL Server. 5: SELECT <select list> 1: FROM <table source> 2: WHERE <search condition> 3: GROUP BY <group by list> 4: HAVING <search condition> 6: ORDER BY <order by list>

  21. Applying the logical order of operations to writing SELECT statements USEAdventureWorks2012; SELECTSalesPersonID,YEAR(OrderDate)ASOrderYear FROMSales.SalesOrderHeader WHERECustomerID= 29974 GROUPBYSalesPersonID,YEAR(OrderDate) HAVINGCOUNT(*)> 1 ORDERBYSalesPersonID,OrderYear; USEAdventureWorks2012; SELECTSalesPersonID,YEAR(OrderDate)ASOrderYear FROMSales.SalesOrderHeader WHERECustomerID=29974 GROUPBYSalesPersonID,YEAR(OrderDate) HAVINGCOUNT(*)> 1 ORDERBYSalesPersonID,OrderYear;

  22. Basic SELECT Statements

  23. Elements of the SELECT statement

  24. Retrieving columns from a table or view • Use SELECT with column list to display columns • Use FROM to specify a source table or view • Specify both schema and table names • Delimit names if necessary • End all statements with a semicolon SELECTCustomerID,StoreID FROMSales.Customer;

  25. Using calculations in the SELECT clause • Calculations are scalar, returning one value per row • Using scalar expressions in the SELECT clause SELECTunitprice,OrderQty,(unitprice *OrderQty) FROMsales.salesorderdetail;

  26. Demo Writing basic SELECT statements

  27. Summary • Three types of command used to manage SQL server objects and security include; DDL, DML, and DCL • T-SQL language elements include; • Predicates and operators – BETWEEN, LIKE, NOT, >=, * • Functions – string, date and time, aggregate • Variables – local has one @, system has two @@ • Expressions – identifiers, values, and operators • Batch separators – GO used to separate statements • Control-of-flow – IF…ELSE, WHILE, CONTINUE • Comments - /* to start */ to end; can also use --

  28. Summary • Predicate logic is a property or expression that is either true or false. Also referred to as a Boolean expression • Elements of a SELECT statement and the order they are evaluated : • 1. FROM • 2. WHERE • 3. GROUP BY • 4. HAVING • 5. SELECT • 6. ORDER BY

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