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Data Manipulation using SQL

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SQL 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

Tarefa

Swipe to start coding

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.

Solução

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Seção 2. Capítulo 5
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book
SQL 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

Tarefa

Swipe to start coding

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.

Solução

Switch to desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
Tudo estava claro?

Como podemos melhorá-lo?

Obrigado pelo seu feedback!

Seção 2. Capítulo 5
Switch to desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
Sentimos muito que algo saiu errado. O que aconteceu?
some-alt