Use the where operator to filter if a Boolean field is true or false. For example, using the boolean field "valid":
- Filter to keep true:
| where valid
- Filter to keep false:
| where !valid
To filter results in a search query, use "where" as a conditional operator. The where operator must appear as a separate operator distinct from other operators, delimited by the pipe symbol ("|"). In other words, the following construct will not work and will generate a syntax error:
This query will NOT work:
...| parse "seconds=*;" as time where > 5
Instead, separate the where operator from the preceding parse operator like this:
...| parse "seconds=*;" as time
| where time > 5
... | where <boolean expression> | ...
- The pipe delimiter is required to separate the where operator as a distinct query operator.
- The where operator cannot be used inline as a query clause, like "... | extract a where b==something |...."
- * is allowed for string matching (zero or more than one character).
- Multiple where-expressions are processed in the order they are specified, with each subsequent where operator further filtering results.
- If you are using "in" or "not in" to match integers, cast "x" to a number first.
- You can use other operators within the where statement after the pipe, such as OR and AND.
... | where a<b | count by _sourceHost
... | where a=x
... | where a>=x
... | where a<=x
... | where a<x
... | where x="some string"
... | where x matches "some string"
... | where x matches "fail*"
... | where x<10
... | where user<>"root"
... | where error="fail*"
... | num(x) | where x in (4, 3, 5)
... | where x in ("error", "fail")
... | where x not in ("error", "fail")
... | where cs_user_agent matches "Android" or cs_user_agent matches "iPhone" or cs_user_agent matches "iPad"
Using the "not" option
If you need a query using the where operator, where xxx DOES NOT match yyy, use "!" followed by the matches operator enclosed in parenthesis.
...| where !(<field xxx> matches "<value yyy>") | ...
...| where !(status matches "200")
Use where to check for null values
For details, see isNull operator.