One of the first steps in data analysis is examining data through aggregations. This chapter explores how to create aggregations in SQL Server, a common first step in data exploration. You will also clean missing data and categorize data into bins with CASE statements.

Data analysis with aggregations

Creating aggregations

Creating grouped aggregations

Dealing with missing data

Removing missing values

Imputing missing values (I)

Imputing missing values (II)

Binning data with CASE

Using CASE statements

Creating several groups with CASE

Summarizing Data

This chapter explores essential math operations such as rounding numbers, calculating squares and square roots, and counting records. You will also work with dates in this chapter! 

Counting and totals

Calculating the total

Counting the number of rows

Dates

Which date function should you use?

Counting the number of days between dates

Adding days to a date

Rounding and truncating

Rounding numbers

Truncating numbers

More math functions

Calculating the absolute value

Calculating squares and square roots

Math Functions

In this chapter, you will create variables and write while loops to process data. You will also write complex queries by using derived tables and common table expressions. 

WHILE loops

Creating and using variables

Creating a WHILE loop

Derived tables

Queries with derived tables (I)

Queries with derived tables (II)

Common Table Expressions

CTE syntax

Creating CTEs (I)

Creating CTEs (II)

Processing Data in SQL Server

In the final chapter of this course, you will work with partitions of data and window functions to calculate several summary stats and see how easy it is to create running totals and compute the mode of numeric columns.

Window functions in T-SQL

Window functions with aggregations (I)

Window functions with aggregations (II)

Common window functions

Do you know window functions?

First value in a window

Previous and next values

Increasing window complexity

Creating running totals

Assigning row numbers

Using windows for statistical functions

Calculating standard deviation

Calculating mode (I)

Calculating mode (II)

Window Functions

Incidents

Shipments

Kidney

Orders

A majority of data is stored in databases and knowing the necessary tools needed to analyze and clean data directly in databases is indispensable. This course focuses on T-SQL, the version of SQL used in Microsoft SQL Server, needed for data analysis. You will learn several concepts in this course such as dealing with missing data, working with dates, and calculating summary statistics using advanced queries. After completing this course, you will have the skills needed to analyze data and provide insights quickly and easily.

Introduction to SQL Server

Learn concepts for working in  T-SQL, such as dealing with missing data, working with dates, and calculating summary statistics using advanced queries.

Intermediate SQL Server

In this course, you will use T-SQL, the flavor of SQL used in Microsoft's SQL Server for data analysis.

Sviluppatore SQL Server

Fondamenti di SQL Server

Counting the number of days between dates

Intermediate SQL Server

Istruzioni dell'esercizio

Esercizio pratico interattivo