Cheatsheet sql naar Kusto Query Language

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Van toepassing op: ✅ Microsoft Fabric ✅ Azure Data Explorer ✅ Azure Monitor ✅ Microsoft Sentinel

Als u bekend bent met SQL en KQL wilt leren, vertaalt u SQL-query's naar KQL door de SQL-query vooraf te laten gaan met een opmerkingsregel --en het trefwoord explain. De uitvoer toont de KQL-versie van de query, waarmee u inzicht krijgt in de KQL-syntaxis en concepten.

De query uitvoeren

--
explain
SELECT COUNT_BIG(*) as C FROM StormEvents 

Uitvoer

Query
StormEvents<br>| summarize C=count()<br>| project C

Cheatsheet voor conversie van SQL naar Kusto

In de volgende tabel ziet u voorbeeldquery's in SQL en de bijbehorende KQL-equivalenten.

Categorie	SQL-query	Kusto-query	Meer informatie
Gegevens uit tabel selecteren	SELECT * FROM dependencies	dependencies	Instructies voor tabellaire expressies
--	SELECT name, resultCode FROM dependencies	dependencies | project name, resultCode	project
--	SELECT TOP 100 * FROM dependencies	dependencies | take 100	take
Null-evaluatie	SELECT * FROM dependencies WHERE resultCode IS NOT NULL	dependencies | where isnotnull(resultCode)	isnotnull()
Vergelijkingsoperatoren (datum)	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))	tussen
Vergelijkingsoperatoren (tekenreeks)	SELECT * FROM dependencies WHERE type = "Azure blob"	dependencies | where type == "Azure blob"	Logische operators
--	-- substring SELECT * FROM dependencies WHERE type like "%blob%"	// substring dependencies | where type has "blob"	heeft
--	-- wildcard SELECT * FROM dependencies WHERE type like "Azure%"	// wildcard dependencies | where type startswith "Azure" // or dependencies | where type matches regex "^Azure.*"	startswith komt overeen met regex
Vergelijking (Booleaanse waarde)	SELECT * FROM dependencies WHERE !(success)	dependencies | where success == False	Logische operators
Groeperen, aggregatie	SELECT name, AVG(duration) FROM dependencies GROUP BY name	dependencies | summarize avg(duration) by name	Samenvatten avg()
Distinct	SELECT DISTINCT name, type FROM dependencies	dependencies | distinct name, type	Samenvatten Verschillende
--	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()
Kolomaliassen, Uitbreiden	SELECT operationName as Name, AVG(duration) as AvgD FROM dependencies GROUP BY name	dependencies | summarize AvgD = avg(duration) by Name=operationName	Aliasinstructie
--	SELECT conference, CONCAT(sessionid, ' ' , session_title) AS session FROM ConferenceSessions	ConferenceSessions | extend session=strcat(sessionid, " ", session_title) | project conference, session	strcat() Project
Bestellen	SELECT name, timestamp FROM dependencies ORDER BY timestamp ASC	dependencies | project name, timestamp | sort by timestamp asc nulls last	sort
Top n per meting	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	Boven
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))
Aansluiten	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
Geneste query's	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
Hebbende	SELECT COUNT(\*) FROM dependencies GROUP BY name HAVING COUNT(\*) > 3	dependencies | summarize Count = count() by name | where Count > 3	Samenvatten Waar

Verwante inhoud

• T-SQL gebruiken om query's uit te voeren op gegevens