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Data Manipulation using SQL
course content

Course Content

Data Manipulation using SQL

Data Manipulation using SQL

1. Database and Nested Queries
DatabaseSQL In StatementChallenge In StatementSQL Exists Statement
2. SQL Joining Tables
SQL Inner JoinSQL JoinsSQL Left & Right JoinSQL Full Outer JoinSQL Union
3. SQL Tasks
Challenge: Albums with Two SongsChallenge: the Biggest AlbumChallenge: Rating of SingersChallenge: DecadesChallenge: Two SingersChallenge: Solo vs BandsChallenge: Solo AlbumsChallenge: Singers Stats

bookSQL Joins

There are four main types of joining: Inner, Full, Left, and Right. The difference is based on which records are autocompleted with NULL if there are no matching in left or right tables.

On this example, we can see, that for INNER joining takes place only for that id's that are present in both joining columns, or for their intersection. For FULL, it makes joining for all ids that are present, or for their union. LEFT and RIGHT join does the joining for ids in the left or right table.

We can see more on the diagram:

Usually, we use INNER or LEFT join, but it depends on the situation.

Task

Try to join 3 tables. Select all songs and their albums and singers: join singers and songs on singer_id and songs and albums on album_id. Order albums lexicographically (column title of albums).

Use aliases for column names: song for songs.title, album for albums.title, and singer for singers.naming.

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Section 2. Chapter 2
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bookSQL Joins

There are four main types of joining: Inner, Full, Left, and Right. The difference is based on which records are autocompleted with NULL if there are no matching in left or right tables.

On this example, we can see, that for INNER joining takes place only for that id's that are present in both joining columns, or for their intersection. For FULL, it makes joining for all ids that are present, or for their union. LEFT and RIGHT join does the joining for ids in the left or right table.

We can see more on the diagram:

Usually, we use INNER or LEFT join, but it depends on the situation.

Task

Try to join 3 tables. Select all songs and their albums and singers: join singers and songs on singer_id and songs and albums on album_id. Order albums lexicographically (column title of albums).

Use aliases for column names: song for songs.title, album for albums.title, and singer for singers.naming.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

Section 2. Chapter 2
toggle bottom row

bookSQL Joins

There are four main types of joining: Inner, Full, Left, and Right. The difference is based on which records are autocompleted with NULL if there are no matching in left or right tables.

On this example, we can see, that for INNER joining takes place only for that id's that are present in both joining columns, or for their intersection. For FULL, it makes joining for all ids that are present, or for their union. LEFT and RIGHT join does the joining for ids in the left or right table.

We can see more on the diagram:

Usually, we use INNER or LEFT join, but it depends on the situation.

Task

Try to join 3 tables. Select all songs and their albums and singers: join singers and songs on singer_id and songs and albums on album_id. Order albums lexicographically (column title of albums).

Use aliases for column names: song for songs.title, album for albums.title, and singer for singers.naming.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

There are four main types of joining: Inner, Full, Left, and Right. The difference is based on which records are autocompleted with NULL if there are no matching in left or right tables.

On this example, we can see, that for INNER joining takes place only for that id's that are present in both joining columns, or for their intersection. For FULL, it makes joining for all ids that are present, or for their union. LEFT and RIGHT join does the joining for ids in the left or right table.

We can see more on the diagram:

Usually, we use INNER or LEFT join, but it depends on the situation.

Task

Try to join 3 tables. Select all songs and their albums and singers: join singers and songs on singer_id and songs and albums on album_id. Order albums lexicographically (column title of albums).

Use aliases for column names: song for songs.title, album for albums.title, and singer for singers.naming.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Section 2. Chapter 2
Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
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