Filtering, Ordering, and Limiting Data with SQL - Lab

Introduction

In this lab, you will practice writing SQL SELECT queries that limit results based on conditions, using WHERE, ORDER BY, and LIMIT.

Objectives

You will practice the following:

Order the results of your queries by using ORDER BY (ASC & DESC)
Limit the number of records returned by a query using LIMIT
Write SQL queries to filter and order results

The Data

Here's a database full of famous dogs! The dogs table is populated with the following data:

name	age	gender	breed	temperament	hungry
Snoopy	3	M	beagle	friendly	1
McGruff	10	M	bloodhound	aware	0
Scooby	6	M	great dane	hungry	1
Little Ann	5	F	coonhound	loyal	0
Pickles	13	F	black lab	mischievous	1
Clifford	4	M	big red	smiley	1
Lassie	7	F	collie	loving	1
Snowy	8	F	fox terrier	adventurous	0
NULL	4	M	golden retriever	playful	1

Connecting to the Database

In the cell below, import pandas and sqlite3. Then establish a connection to the database dogs.db.

Look at all of the data in the table by selecting all columns from the dogs table with pd.read_sql.

# Your code here; imports, create a connection, select all

Queries

Display the outputs for each of the following query descriptions.

Select the name and breed for all female dogs

Click for hint:

Use WHERE with the = operator

# Your code here

Select the number of dogs that do not have a name

Click for hint:

Use COUNT and IS NULL

# Your code here

Select the names of all dogs that contain the double letters `ff` or `oo`

Click for hint:

Use LIKE, %, and OR

# Your code here

Select the names of all dogs listed in alphabetical order. Notice that SQL lists the nameless dog first.

Click for hint:

Use ORDER BY

# Your code here

Select the name and breed of only the hungry dogs and list them from youngest to oldest

# Your code here

Select the oldest dog's name, age, and temperament

Click for hint:

Use ORDER BY with LIMIT

# Your code here

Select the name and age of the three youngest dogs

# Your code here

Select the name and breed of the dogs who are between five and ten years old, ordered from oldest to youngest

Click for hint:

Use WHERE with BETWEEN

# Your code here

Select the name, age, and hungry columns for hungry dogs between the ages of two and seven. This query should also list these dogs in alphabetical order.

# Your code here

Close the Database Connection

# Your code here

Summary

Great work! In this lab you practiced writing more complex SQL statements to not only query specific information but also define the quantity and order of your results.

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dsc-filtering-and-ordering-lab's Introduction

Filtering, Ordering, and Limiting Data with SQL - Lab

Introduction

Objectives

The Data

Connecting to the Database

Queries

Select the name and breed for all female dogs

Click for hint:

Select the number of dogs that do not have a name

Click for hint:

Select the names of all dogs that contain the double letters ff or oo

Click for hint:

Select the names of all dogs listed in alphabetical order. Notice that SQL lists the nameless dog first.

Click for hint:

Select the name and breed of only the hungry dogs and list them from youngest to oldest

Select the oldest dog's name, age, and temperament

Click for hint:

Select the name and age of the three youngest dogs

Select the name and breed of the dogs who are between five and ten years old, ordered from oldest to youngest

Click for hint:

Select the name, age, and hungry columns for hungry dogs between the ages of two and seven. This query should also list these dogs in alphabetical order.

Close the Database Connection

Summary

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Select the names of all dogs that contain the double letters `ff` or `oo`