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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

SQL Exists Statement

The EXISTS operator is a logical operator which returns TRUE if there is at least one element in the query and FALSE in another case. The next query returns all albums after 2008 first, and if at least such an album exists, retrieves all the songs:


              
1234

            
SELECT title FROM songs
WHERE EXISTS
  (SELECT id FROM albums
  WHERE year > 2008)
copy

We can also use NOT EXISTS. This operator can be used as an additional logical condition after the WHERE statement.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Section 1. Chapter 4
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SQL Exists Statement

The EXISTS operator is a logical operator which returns TRUE if there is at least one element in the query and FALSE in another case. The next query returns all albums after 2008 first, and if at least such an album exists, retrieves all the songs:


              
1234

            
SELECT title FROM songs
WHERE EXISTS
  (SELECT id FROM albums
  WHERE year > 2008)
copy

We can also use NOT EXISTS. This operator can be used as an additional logical condition after the WHERE statement.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Section 1. Chapter 4
toggle bottom row

SQL Exists Statement

The EXISTS operator is a logical operator which returns TRUE if there is at least one element in the query and FALSE in another case. The next query returns all albums after 2008 first, and if at least such an album exists, retrieves all the songs:


              
1234

            
SELECT title FROM songs
WHERE EXISTS
  (SELECT id FROM albums
  WHERE year > 2008)
copy

We can also use NOT EXISTS. This operator can be used as an additional logical condition after the WHERE statement.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

The EXISTS operator is a logical operator which returns TRUE if there is at least one element in the query and FALSE in another case. The next query returns all albums after 2008 first, and if at least such an album exists, retrieves all the songs:


              
1234

            
SELECT title FROM songs
WHERE EXISTS
  (SELECT id FROM albums
  WHERE year > 2008)
copy

We can also use NOT EXISTS. This operator can be used as an additional logical condition after the WHERE statement.

Switch to desktop for real-world practiceContinue from where you are using one of the options below
Section 1. Chapter 4
Switch to desktop for real-world practiceContinue from where you are using one of the options below
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