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Data Manipulation using SQL
course content

Contenido del Curso

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 Union

UNION is an operator that concatenates results of different SQL queries:


              
1234567

            
--do not run this query
SELECT columns FROM table1
UNION
SELECT columns FROM table2
UNION
...
SELECT columns FROM tableN
copy

There is also an operator UNION ALL, and the difference is that UNION returns distinct values, unlike UNION ALL.

Requirements for using UNION operators:

  • number of columns in SELECT should be the same
  • data types and order of columns should be the same

Tarea

You want to get some info about songs from three decades: 1970s, 1980s, and 1990s. Find the prices of the cheapest and the most expensive songs for each decade in separate queries. You're free to use JOIN, BETWEEN, or any other operators, but you should do three separate queries and concatenate them with UNION.

Switch to desktopCambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones
¿Todo estuvo claro?

¿Cómo podemos mejorarlo?

¡Gracias por tus comentarios!

Sección 2. Capítulo 5
toggle bottom row

bookSQL Union

UNION is an operator that concatenates results of different SQL queries:


              
1234567

            
--do not run this query
SELECT columns FROM table1
UNION
SELECT columns FROM table2
UNION
...
SELECT columns FROM tableN
copy

There is also an operator UNION ALL, and the difference is that UNION returns distinct values, unlike UNION ALL.

Requirements for using UNION operators:

  • number of columns in SELECT should be the same
  • data types and order of columns should be the same

Tarea

You want to get some info about songs from three decades: 1970s, 1980s, and 1990s. Find the prices of the cheapest and the most expensive songs for each decade in separate queries. You're free to use JOIN, BETWEEN, or any other operators, but you should do three separate queries and concatenate them with UNION.

Switch to desktopCambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones
¿Todo estuvo claro?

¿Cómo podemos mejorarlo?

¡Gracias por tus comentarios!

Sección 2. Capítulo 5
toggle bottom row

bookSQL Union

UNION is an operator that concatenates results of different SQL queries:


              
1234567

            
--do not run this query
SELECT columns FROM table1
UNION
SELECT columns FROM table2
UNION
...
SELECT columns FROM tableN
copy

There is also an operator UNION ALL, and the difference is that UNION returns distinct values, unlike UNION ALL.

Requirements for using UNION operators:

  • number of columns in SELECT should be the same
  • data types and order of columns should be the same

Tarea

You want to get some info about songs from three decades: 1970s, 1980s, and 1990s. Find the prices of the cheapest and the most expensive songs for each decade in separate queries. You're free to use JOIN, BETWEEN, or any other operators, but you should do three separate queries and concatenate them with UNION.

Switch to desktopCambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones
¿Todo estuvo claro?

¿Cómo podemos mejorarlo?

¡Gracias por tus comentarios!

UNION is an operator that concatenates results of different SQL queries:


              
1234567

            
--do not run this query
SELECT columns FROM table1
UNION
SELECT columns FROM table2
UNION
...
SELECT columns FROM tableN
copy

There is also an operator UNION ALL, and the difference is that UNION returns distinct values, unlike UNION ALL.

Requirements for using UNION operators:

  • number of columns in SELECT should be the same
  • data types and order of columns should be the same

Tarea

You want to get some info about songs from three decades: 1970s, 1980s, and 1990s. Find the prices of the cheapest and the most expensive songs for each decade in separate queries. You're free to use JOIN, BETWEEN, or any other operators, but you should do three separate queries and concatenate them with UNION.

Switch to desktopCambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones
Sección 2. Capítulo 5
Switch to desktopCambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones
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