Basiscursus T-SQL Zelfstudiepakket

Algemene omschrijving

In dit zelfstudiepakket zit het officiële cursusmateriaal, een labomgeving en het DKA-T-SQL-examen. Je hebt 180 dagen toegang tot de labomgeving.

SQL is de taal die hoort bij relationele databases. T-SQL is het SQL dialect dat hoort bij Microsoft SQL Server. Relationele databases vormen nog altijd het merendeel van de databases zoals die ingebruik zijn. Ook zogenaamde noSQL databases (Big Data) maken tegenwoordig veel gebruik van SQL. Azure Cosmos DB en Azure Stream Analytics gebruiken een vorm van SQL om data te ontsluiten. Kortom, SQL is al jaren en blijft nog jaren de basis voor als je veel met gegevens werkt. Een Must voor elke data professional.

In deze cursus leer je de taal SQL. Na de cursus kan je zelfstandig query’s schrijven op databases om de gegevens in die databases te kunnen ontsluiten. Je leert gegevens te filteren, je leert tabellen te combineren, je leert aggregeren en je leert veel nuttige functies en constructies om meteen na de cursus de meest leuke en nuttige query’s te kunnen schrijven.

Doelgroep

Iedereen die gegevens uit databases wil gebruiken. Business Intelligence developers die bronsystemen moeten ontsluiten en/of datawarehouses moeten opzetten. Applicatieontwikkelaars die vanuit de applicatie met de database moeten communiceren. Database developers die databases moeten ontwerpen en server side code ontwikkelen.

Leerdoelen

Verkrijgen van praktische toepasbare kennis en vaardigheden en voorbereiding op het afsluitende DKA examen T-SQL.

Je leert het SELECT statement in al zijn facetten (JOIN, WHERE, GROUP BY, ORDER BY). Je leert standaard functies te gebruiken alsmede meer geavanceerde functies zoals bijvoorbeeld de windowing functions.

Je leert met UPDATE, INSERT en DELETE bestaande gegevens te manipuleren en daarbij transacties toe te passen.

Je leert performance effecten van verschillende queries in the schatten.

Je leert werken met SQL Server Management Studio en/of Azure Data Studio.

Voorkennis

Er is geen directe voorkennis vereist. Affiniteit met data is wel een vereiste. Kennis van een of meer programmeertalen, bij voorkeur Python of R is een pre, maar geen vereiste.

Onderwerpen

Module 1: Getting Started with Transact-SQL

In this module you will learn about the basics of the Transact-SQL (T-SQL) language, as well as general properties and terminology of relational databases. This module will also introduce the basic SELECT statement for retrieving data from a table.

Lesson

• Introduction to Transact-SQL
• Using the SELECT statement

Lab : Get started with SQL Server query tools and writing queries in T-SQL

After completing this module, students will be able to:

• Using a query tool to write and execute queries in Transact-SQL
• Understand the basic concepts of relational database and the T-SQL language
• Write SELECT statements to retrieve data from a relational database table
• Understand basic datatypes and how they are used
• Understand the basics of NULL values

Module 2: Sorting and Filtering Query Results

In the module you will learn how to control what data is returned, the order in which it is returned. You will use the ORDER BY clause, with and without paging. You will learn about various kinds of filters that can be used in the WHERE clause to control which data rows are returned. You will also learn how to manage the results by removing duplicates with DISTINCT.

Lesson

• Sorting query results
• Filtering the data

Lab : Sort and filter data returned by SELECT queries

After completing this module, students will be able to:

• Use ORDER BY to sort results from a T-SQL SELECT statement
• Add a TOP clause to limit the ordered rows returned
• Page the sorted data with OFFSET-FET
• Write WHERE clauses to filter the rows returned
• Use DISTINCT to eliminate duplicate rows in the results

Module 3: Using Joins and Subqueries

In this module, you will explore T-SQL queries which access data from multiple tables with various kinds of JOIN operations and simple subqueries.Lesson

• Using JOIN operations
• Using subqueries

Lab : Write queries with JOIN operations

Lab : Write SELECT statements using subqueries

After completing this module, students will be able to:

• Write queries accessing data from multiple tables using JOIN operations
• Understand the differences between type of JOIN operations: INNER JOIN, OUTER JOIN, CROSS JOIN
• Understand how to join a table to itself with a self-join
• Write subqueries within a SELECT statement
• Understand the difference between scalar and multi-valued subqueries
• Understand the difference between correlated and self-contained subqueries

Module 4: Using Built-in Functions

In the module you will explore the use of built-in functions for returning computed or special values in the SELECT list or in the WHERE clause. Functions include math functions, string functions and system functions. There are other types of functions that will be mentioned, but not discussed in detail. You will also learn how to combine rows of data into a single group, providing summary information for the group such as SUM, MIN or MAX.Lesson

• Getting started with scalar functions
• Grouping aggregated results

Lab : Built-in functions

After completing this module, students will be able to:

• Write queries using scalar functions
• Write queries using aggregate functions
• Use GROUP BY to combine data into groups based on a common column value
• Understand how HAVING is used to filter groups of rows

Module 5: Modifying Data

In this module, you will learn the T-SQL statements for modifying table data including UPDATE, DELETE and MERGE as well as various options for INSERT including creating a new table with data from an existing table. You will also look at how to have the system automatically supply values for columns as the data is inserted.

Lesson

• Inserting data into tables
• Modifying and deleting data

Lab : Modify data

After completing this module, students will be able to:

• Insert data into an existing table
• Specify that a column should be automatically populating with an IDENTITY or a SEQUENCE value
• Modify data using the UPDATE statement
• Delete data using the DELETE statement
• Modify data using MERGE to synchronize two tables