Referensi cepat SQL ke Bahasa Kueri Kusto

  • Artikel

Jika Anda terbiasa dengan SQL dan ingin mempelajari KQL, terjemahkan kueri SQL ke dalam KQL dengan mengawali 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

Output

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 ambil
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"		 Hsa
-- -- wildcard
SELECT * FROM dependencies
WHERE type like "Azure%"		 // wildcard
dependencies
| where type startswith "Azure"
// or
dependencies
| where type matches regex "^Azure.*"		 startswith
cocok dengan 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
| summarize by 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		 strcat()
Proyek
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		 teratas
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		 gabung
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
Mana

Konten terkait

  • Menggunakan T-SQL untuk mengkueri data