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Neo4j Graph Database Fundamentals · Aula

Filtrando e Ordenando Resultados

Utilize as cláusulas WHERE e ORDER BY para refinar os resultados das suas consultas e garantir que você obtenha exatamente os dados necessários.

Filtrando e Ordenando Resultados é uma aula grátis de Neo4j Graph Database Fundamentals no CoddyKit. Esta é a aula 1 de 4. Você pode ler a aula completa abaixo gratuitamente — depois pratica ao vivo no navegador com um editor de código integrado e um tutor de IA 24/7. Faz parte do caminho de aprendizado de Neo4j Graph Database Fundamentals, e seu progresso é sincronizado entre a web e o app CoddyKit. O curso de Neo4j Graph Database Fundamentals inclui 4 aulas no total.

Partes desta aula ainda não foram traduzidas e aparecem em inglês.

Refine Your Graph Queries

When working with large graphs, you often need to find very specific information or present it in a particular order.

  • Filtering helps you narrow down results to only what's relevant.
  • Ordering helps you sort your results for better readability or analysis.

In this lesson, we'll master the WHERE and ORDER BY clauses in Cypher.

Filter Results with WHERE

The WHERE clause is used to filter patterns or properties based on specific conditions. It typically comes after a MATCH clause.

Think of it like saying: "Find me all people, WHERE their birth year is 1970."

MATCH (p:Person)
WHERE p.born = 1970
RETURN p.name AS Name, p.born AS BornYear

Comparison Operators

You can use various comparison operators in your WHERE clause:

  • = (equal to)
  • <> (not equal to)
  • > (greater than)
  • < (less than)
  • >= (greater than or equal to)
  • <= (less than or equal to)

Let's find movies released after the year 2000.

MATCH (m:Movie)
WHERE m.released > 2000
RETURN m.title AS MovieTitle, m.released AS ReleaseYear

Logical Operators (AND, OR)

Combine multiple conditions using logical operators:

  • AND: Both conditions must be true.
  • OR: At least one condition must be true.
  • XOR: Exactly one condition must be true.
  • NOT: Negates a condition.

Find people born between 1970 and 1980 (inclusive).

MATCH (p:Person)
WHERE p.born >= 1970 AND p.born <= 1980
RETURN p.name AS Name, p.born AS BornYear

String and List Operators

Cypher offers powerful operators for string matching and list containment:

  • CONTAINS, STARTS WITH, ENDS WITH for partial string matches.
  • IN to check if a property value is within a list of values.

Let's find specific actors by name using IN.

MATCH (p:Person)
WHERE p.name IN ['Tom Hanks', 'Keanu Reeves', 'Carrie-Anne Moss']
RETURN p.name AS ActorName

Sort Your Results with ORDER BY

The ORDER BY clause sorts your query results. It comes after RETURN (or WITH).

By default, results are sorted in ascending order (smallest to largest, A-Z).

MATCH (p:Person)
RETURN p.name AS ActorName
ORDER BY ActorName

Ascending & Descending Order

You can explicitly specify the sort direction:

  • ASC: Ascending (A-Z, 0-9). This is the default.
  • DESC: Descending (Z-A, 9-0).

Let's sort movies by their release year, from newest to oldest.

MATCH (m:Movie)
RETURN m.title AS MovieTitle, m.released AS ReleaseYear
ORDER BY ReleaseYear DESC

Multi-Level Sorting

You can sort by multiple properties. The order in which you list them in ORDER BY matters.

Cypher will first sort by the first property, then by the second for any ties in the first, and so on.

Sort people by birth year (ascending), and then by name (ascending) for those born in the same year.

MATCH (p:Person)
RETURN p.born AS BornYear, p.name AS ActorName
ORDER BY BornYear ASC, ActorName ASC

Putting it All Together

A typical Cypher query flow often involves:

  1. MATCH: Find the graph pattern.
  2. WHERE: Filter the matched patterns.
  3. RETURN: Select the data you want.
  4. ORDER BY: Sort the returned data.

Find actors born before 1970, order them by name (descending), then by the movie title they acted in (ascending).

MATCH (p:Person)-[:ACTED_IN]->(m:Movie)
WHERE p.born < 1970
RETURN p.name AS Actor, m.title AS Movie, p.born AS BornYear
ORDER BY Actor DESC, Movie ASC

Filter & Order Challenge

Which Cypher query correctly finds movies released after 1999 and orders them by title in descending order?

Recap: Refined Queries

Great job! You've learned how to precisely control your Cypher query results:

  • The WHERE clause filters data based on conditions.
  • The ORDER BY clause sorts your results in ascending or descending order.
  • You can combine these with comparison, logical, and string/list operators for powerful filtering.

Next, we'll explore how to summarize and reshape your data with Aggregation and Projections!

Perguntas Frequentes

A aula “Filtrando e Ordenando Resultados” é grátis?

Sim — o texto completo de “Filtrando e Ordenando Resultados” é grátis para ler aqui na web. Para praticá-la interativamente (um editor de código integrado e um tutor de IA 24/7) e desbloquear o restante do curso de Neo4j Graph Database Fundamentals, atualize para CoddyKit PRO. O curso de Neo4j Graph Database Fundamentals inclui 4 aulas no total.

O que vou aprender em “Filtrando e Ordenando Resultados”?

Utilize as cláusulas WHERE e ORDER BY para refinar os resultados das suas consultas e garantir que você obtenha exatamente os dados necessários. Você pratica Neo4j Graph Database Fundamentals com código prático que executa diretamente no navegador, e um tutor de IA 24/7 responde suas dúvidas enquanto trabalha na aula.

Preciso ter experiência prévia para começar Neo4j Graph Database Fundamentals?

Nenhuma experiência prévia é necessária. Neo4j Graph Database Fundamentals no CoddyKit é estruturado para alunos iniciantes até avançados, então você pode começar aqui ou desde o início e aprender no seu ritmo. Esta é a aula 1 de 4.

Quanto tempo leva a aula “Filtrando e Ordenando Resultados”?

A maioria das aulas CoddyKit leva cerca de 5–10 minutos. Cada uma é compacta e interativa, então você faz progresso constante e retoma exatamente de onde parou entre web e app.

Posso escrever e executar código nesta aula de Neo4j Graph Database Fundamentals?

Sim. Cada aula de Neo4j Graph Database Fundamentals inclui um editor de código integrado, então você escreve e executa código real direto no navegador e recebe feedback de IA instantaneamente — nenhuma configuração local necessária.

Todas as aulas deste curso

  1. Filtrando e Ordenando Resultados
  2. Agregação e Projeções
  3. Atualizando e Excluindo Dados de Grafos
  4. Combinando Consultas com WITH e UNION
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