SQL para Linguagem de Consulta Kusto folha de referências
Se você estiver familiarizado com o SQL e quiser aprender KQL, converta consultas SQL em KQL pré-configurando a consulta SQL com uma linha de comentário, --
e o palavra-chave explain
. A saída mostra a versão KQL da consulta, o que pode ajudá-lo a entender a sintaxe e os conceitos do KQL.
--
explain
SELECT COUNT_BIG(*) as C FROM StormEvents
Saída
Consulta |
---|
StormEvents<br> | resumir C=count()<br> | projeto C |
Roteiro do SQL para o Kusto
A tabela a seguir mostra consultas de exemplo no SQL e seus equivalentes de KQL.
Category | Consulta SQL | Consulta do Azure Data Explorer | Saiba mais |
---|---|---|---|
Selecione os dados da tabela | SELECT * FROM dependencies |
dependencies |
Instrução TABULAR EXPRESSION |
-- | SELECT name, resultCode FROM dependencies |
dependencies | project name, resultCode |
project |
-- | SELECT TOP 100 * FROM dependencies |
dependencies | take 100 |
take |
Avaliação de nulo | SELECT * FROM dependencies WHERE resultCode IS NOT NULL |
dependencies | where isnotnull(resultCode) |
isnotnull() |
Operadores de comparação (data) | SELECT * FROM dependencies WHERE timestamp > getdate()-1 |
dependencies | where timestamp > ago(1d) |
ago() |
-- | SELECT * FROM dependencies WHERE timestamp BETWEEN ... AND ... |
dependencies | where timestamp between (datetime(2016-10-01) .. datetime(2016-11-01)) |
between |
Operadores de comparação (cadeia de caracteres) | SELECT * FROM dependencies WHERE type = "Azure blob" |
dependencies | where type == "Azure blob" |
Operadores lógicos |
-- | -- substring SELECT * FROM dependencies WHERE type like "%blob%" |
// substring dependencies | where type has "blob" |
tem |
-- | -- wildcard SELECT * FROM dependencies WHERE type like "Azure%" |
// wildcard dependencies | where type startswith "Azure" // or dependencies | where type matches regex "^Azure.*" |
startswith corresponde a regex |
Comparação (booliano) | SELECT * FROM dependencies WHERE !(success) |
dependencies | where success == False |
Operadores lógicos |
Agrupamento, Agregação | SELECT name, AVG(duration) FROM dependencies GROUP BY name |
dependencies | summarize avg(duration) by name |
Resumiravg() |
Distinct | SELECT DISTINCT name, type FROM dependencies |
dependencies | summarize by name, type |
ResumirDistintas |
-- | SELECT name, COUNT(DISTINCT type) FROM dependencies GROUP BY name |
dependencies | summarize by name, type | summarize count() by name // or approximate for large sets dependencies | summarize dcount(type) by name |
count()dcount() |
Aliases de coluna, Extensão | SELECT operationName as Name, AVG(duration) as AvgD FROM dependencies GROUP BY name |
dependencies | summarize AvgD = avg(duration) by Name=operationName |
Instrução ALIAS |
-- | SELECT conference, CONCAT(sessionid, ' ' , session_title) AS session FROM ConferenceSessions |
ConferenceSessions | extend session=strcat(sessionid, " ", session_title) | project conference, session |
strcat()Projeto |
Ordenando | SELECT name, timestamp FROM dependencies ORDER BY timestamp ASC |
dependencies | project name, timestamp | sort by timestamp asc nulls last |
sort |
N principais por medida | SELECT TOP 100 name, COUNT(*) as Count FROM dependencies GROUP BY name ORDER BY Count DESC |
dependencies | summarize Count = count() by name | top 100 by Count desc |
início |
Union | SELECT * FROM dependencies UNION SELECT * FROM exceptions |
union dependencies, exceptions |
union |
-- | SELECT * FROM dependencies WHERE timestamp > ... UNION SELECT * FROM exceptions WHERE timestamp > ... |
dependencies | where timestamp > ago(1d) | union (exceptions | where timestamp > ago(1d)) |
|
Join | SELECT * FROM dependencies LEFT OUTER JOIN exceptions ON dependencies.operation_Id = exceptions.operation_Id |
dependencies | join kind = leftouter (exceptions) on $left.operation_Id == $right.operation_Id |
join |
Consultas aninhadas | SELECT * FROM dependencies WHERE resultCode == (SELECT TOP 1 resultCode FROM dependencies WHERE resultId = 7 ORDER BY timestamp DESC) |
dependencies | where resultCode == toscalar( dependencies | where resultId == 7 | top 1 by timestamp desc | project resultCode) |
toscalar |
Having | SELECT COUNT(\*) FROM dependencies GROUP BY name HAVING COUNT(\*) > 3 |
dependencies | summarize Count = count() by name | where Count > 3 |
ResumirOnde |
Conteúdo relacionado
- Usar o T-SQL para consultar dados
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