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!hasprefix_cs operator

项目
08/12/2024

Applies to: ✅ Microsoft Fabric ✅ Azure Data Explorer ✅ Azure Monitor ✅ Microsoft Sentinel

Filters a record set for data that doesn't have a case-sensitive starting string. !hasprefix_cs searches for indexed terms, where an indexed term is three or more characters. If your term is fewer than three characters, the query scans the values in the column, which is slower than looking up the term in the term index.

Operator	Description	Case-Sensitive	Example (yields `true`)
`hasprefix`	RHS is a term prefix in LHS	No	`"North America" hasprefix "ame"`
`!hasprefix`	RHS isn't a term prefix in LHS	No	`"North America" !hasprefix "mer"`
`hasprefix_cs`	RHS is a term prefix in LHS	Yes	`"North America" hasprefix_cs "Ame"`
`!hasprefix_cs`	RHS isn't a term prefix in LHS	Yes	`"North America" !hasprefix_cs "CA"`

Note

The following abbreviations are used in the above table:

RHS = right hand side of the expression
LHS = left hand side of the expression

For more information about other operators and to determine which operator is most appropriate for your query, see datatype string operators.

Performance tips

Note

Performance depends on the type of search and the structure of the data. For best practices, see Query best practices.

Syntax

T | where column !hasprefix_cs (expression)

Learn more about syntax conventions.

Parameters

Name	Type	Required	Description
T	`string`	✔️	The tabular input whose records are to be filtered.
column	`string`	✔️	The column by which to filter.
expression	scalar	✔️	The scalar or literal expression for which to search.

Returns

Rows in T for which the predicate is true.

Example

Run the query

StormEvents
| summarize event_count=count() by State
| where State !hasprefix_cs "P"
| count

Output

Count
64

通过