SQL untuk Bahasa Kueri Kusto contekan

Berlaku untuk: ✅Microsoft Fabric✅Azure Data Explorer✅Azure Monitor✅Microsoft Sentinel

Jika Anda terbiasa dengan SQL dan ingin mempelajari KQL, terjemahkan kueri SQL ke dalam KQL dengan prefacing kueri SQL dengan baris komentar, --, dan kata kunci explain. Output menunjukkan versi KQL kueri, yang dapat membantu Anda memahami sintaks dan konsep KQL.

Menjalankan kueri

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

Hasil

Kueri
StormEvents| meringkas<br> C=count()<br>| proyek C

Lembar cepat SQL ke Kusto

Tabel berikut ini memperlihatkan contoh kueri di SQL dan setara KQL-nya.

Kategori	SQL Query	Kueri Kusto	Pelajari lebih lanjut
Memilih data dari tabel	SELECT * FROM dependencies	dependencies	Pernyataan ekspresi tabular
--	SELECT name, resultCode FROM dependencies	dependencies | project name, resultCode	proyek
--	SELECT TOP 100 * FROM dependencies	dependencies | take 100	take
Evaluasi null	SELECT * FROM dependencies WHERE resultCode IS NOT NULL	dependencies | where isnotnull(resultCode)	isnotnull()
Operator perbandingan (tanggal)	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
Operator perbandingan (string)	SELECT * FROM dependencies WHERE type = "Azure blob"	dependencies | where type == "Azure blob"	Operator logis
--	-- substring SELECT * FROM dependencies WHERE type like "%blob%"	// substring dependencies | where type has "blob"	Memiliki
--	-- wildcard SELECT * FROM dependencies WHERE type like "Azure%"	// wildcard dependencies | where type startswith "Azure" // or dependencies | where type matches regex "^Azure.*"	startswith kecocokan regex
Perbandingan (boolean)	SELECT * FROM dependencies WHERE !(success)	dependencies | where success == False	Operator logis
Pengelompokan, Agregasi	SELECT name, AVG(duration) FROM dependencies GROUP BY name	dependencies | summarize avg(duration) by name	meringkas avg()
Distinct	SELECT DISTINCT name, type FROM dependencies	dependencies | distinct name, type	meringkas berbeda
--	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()
Alias kolom, Memperluas	SELECT operationName as Name, AVG(duration) as AvgD FROM dependencies GROUP BY name	dependencies | summarize AvgD = avg(duration) by Name=operationName	Pernyataan alias
--	SELECT conference, CONCAT(sessionid, ' ' , session_title) AS session FROM ConferenceSessions	ConferenceSessions | extend session=strcat(sessionid, " ", session_title) | project conference, session	proyek strcat()
Memesan	SELECT name, timestamp FROM dependencies ORDER BY timestamp ASC	dependencies | project name, timestamp | sort by timestamp asc nulls last	urutkan
Top n by measure	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	top
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))
Bergabung	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
Kueri bertingkat	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)	skalar
Having	SELECT COUNT(\*) FROM dependencies GROUP BY name HAVING COUNT(\*) > 3	dependencies | summarize Count = count() by name | where Count > 3	meringkas di mana

Konten terkait

• Menggunakan T-SQL untuk mengkueri data