!has_cs operator

Filters a record set for data that doesn't have a matching case-sensitive string. !has_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.

The following table compares the has operators using the abbreviations provided:

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

Operator	Description	Case-Sensitive	Example (yields true)
has	Right-hand-side (RHS) is a whole term in left-hand-side (LHS)	No	"North America" has "america"
!has	RHS isn't a full term in LHS	No	"North America" !has "amer"
has_cs	RHS is a whole term in LHS	Yes	"North America" has_cs "America"
!has_cs	RHS isn't a full term in LHS	Yes	"North America" !has_cs "amer"

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 !has_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 !has_cs "new"
| count

Output

Count
67