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Certification
SQL Server
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NOTES | Grouping and Windowing

SQL Server can perform some data analysis operations. A data analysis function is a function applied to a set of rows, and it returns a single value. An example of such a function is the SUM aggregate function. A data analysis function can be either a group function or a window function. The two types […]

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Certification
SQL Server
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NOTES | Combining Sets

Using Joins Often, data that you need to query is spread across multiple tables. The more normalized the environment is, the more tables you usually have. The tables are usually related through keys, such as a foreign key in one side and a primary key in the other. Then you can use joins to query […]

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Certification
SQL Server
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NOTES | Filtering and Sorting Data

While the traditional way to filter data in T-SQL is based on predicates, it also supports filtering data based on a specified number of rows and ordering. To do so, use TOP and OFFSET. Filtering Data with Predicates ON, WHERE, and HAVING are the three query clauses which enable your filtering of data based on […]

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Exam Preparation
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T-SQL

NOTES | Getting Started with the SELECT Statement

Using the FROM and SELECT Clauses The FROM and SELECT clauses are two principal clauses that appear in almost every query that retrieves data. When you execute a SELECT statement, it usually retrieves one or more rows of information – the exact number depends on how you construct the statement. These rows are collectively known […]

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Certification
SQL Server
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NOTES | A Few Things

In preparing for this exam, my plan is to work my way through each chapter in the Training Kit book, to take notes, gather more information from across the internet and the book SQL Queries For Mere Mortals. In doing so, I’ll be documenting my notes. At times, it can/may be word for word from the training […]

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