Topic: How to Drop Single or Multiple Columns from Table by Using Kusto Query Language.
How to drop single or multiple columns from the table by using Kusto Query | Kusto Query Language Tutorial (KQL) Kusto Query Language is a powerful tool to explore your data and discover patterns, identify anomalies and outliers, create statistical modeling, and more. The query uses schema entities that are organized in a hierarchy similar to SQL's: databases, tables, and columns. A Kusto query is a read-only request to process data and return results. The request is stated in plain text, using a data-flow model that is easy to read, author, and automate. Kusto queries are made of one or more query statements.
How to drop single or multiple Columns from a table by using Kusto
//.drop column
//This command does not physically delete the data, and does not reduce
//the cost of storage for data that was already ingested.
//This command is irreversible. All data in the column that is removed will no longer be queryable.
// Future commands to add that column back will not be able to restore the data.
//Let's create sampel table TotalSale and insert some data.
.drop table TotalSale
.create table TotalSale (
id: int
,SalePersonFName: string
,SalePersonLName : string
,ProductName : string
,ItemsSold : int
,SoldPrice :real
,SoldDate: date
,City : string
,State : string
,Country : string
,Region : string
)
//Insert data
.ingest inline into table TotalSale <|
11,Tamara,Tony,Cell Phone,2,1200.50,2015-03-03,Frankfurt,Hesse,Germany,Europe
9,Petra,Henry,TV,10,5000.89,2015-04-08,Paris,Île-de-France,France,Europe
3,Christy,Ladson,TV,3,1600,2015-04-02,High Point,NC,USA,North America
7,Chirag,Patel,Cell Phone,5,1500,2015-06-23,AhmadAbad,Gujrat,India,Asia
//Check the data in table
TotalSale
// Let's say we want to drop column Region
//Syntax : .drop column TableName . ColumnName
.drop column TotalSale.Region
//Check the data in table
TotalSale
//If you want to drop multiple columns
.drop table TotalSale columns (City,State,Country)
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