DQL operators

Numerical operators

The types long, double and timestamp real represent numerical types. The following operators can be used between pairs of these types

Operator	Description	Example
`+`	Addition	`2+2.5`
`-`	Subtraction	`0.2-0.11`
`*`	Multiplication	`45, 601s`
`/`	Division	`10/2, 1h/60`
`%`	Modulo	`4%2`
`<`	Lower	`8 < 9, now()-1m < now()`
`<=`	Lower than or equal	`4<=5`
`>`	Greater	`5 > 4`
`>=`	Greater than or equal	`4 >=4`
`==`	Equals	`2 == 2`
`!=`	Not equals	`1 != 2`

ADDITION

ADDITION	Long	Double	Timestamp	Duration	Timeframe
Long	(long)	(double)
Double	(double)	(double)
String
Boolean
Timestamp				(timestamp)
Duration			(timestamp)	(duration)	(timeframe)
Timeframe				(timeframe)
Binary
Array
Record

SUBTRACT

SUBTRACT	Long	Double	Timestamp	Duration
Long	(long)	(double)
Double	(double)	(double)
String
Boolean
Timestamp			(duration)	(timestamp
Duration				(duration)
Timeframe				(timeframe)
Binary
Array
Record

MULTIPLY

MULTIPLY	Long	Double	Duration
Long	(long)	(double)	(duration)
Double	(double)	(double)	(duration, rounded to full nanos)
String
Boolean
Timestamp
Duration	(duration)	(duration, rounded to full nanos)
Timeframe
Binary
Array
Record

DIVIDE

DIVIDE	Long	Double	Duration
Long	(long)	(double)
Double	(double)	(double)
String
Boolean
Timestamp
Duration	(duration)	(duration rounded to full nanos)	(double)
Timeframe
Binary
Array
Record

MODULO

MODULO	Long	Double	Duration
Long	(long)	(double)
Double	(double)	(double)
String
Boolean
Timestamp
Duration			(duration)
Timeframe
Binary
Array
Record

NEGATE

NEGATE	Long	Double	String	Boolean	Timestamp	Duration	Timeframe	Binary	Array	Record
SELF	(long)	(double)				(duration)

Logical or equality operators

Operator	Description	Example (yields true)
`==`	Equals - Yields true if both operands are not null and equal to each other. Otherwise, false.	`2==2`, `"a" == "a"`
`!=`	Not equals - Yields null, if one of the operands is null, or if the operands are not equal to each other.	`2!=1, "b" != "a"`
`NOT`	Negation - Negates a logical state	`NOT 2==1`
`AND`	Logical and (multiplication) - Yields true if both operands are true.	`NOT 2==1 AND 1<2`
`OR`	Logical or (addition) - Yields true if one of the operands is true, regardless of the other operand.	`1 < 2 OR 1 > 2`
`XOR`	Exclusive or - Yields true if one of the operands is true, but false in case both are true.	`1 < 2 XOR 1 > 2`

Logical operators and boolean values

The behavior of logical operators follows the tri-state boolean logic.

AND
- true AND null = null
- null AND true = null
- false AND null = false
- null AND false = false
- null AND null = null
OR
- true OR null = true
- null OR true = true
- false OR null = null
- null OR false = null
- null OR null = null
XOR
- true XOR null = null
- null XOR true = null
- false XOR null = null
- null XOR false = null
- null XOR null = null
NOT
- NOT null = null

Equality comparisons (==, !=) use a tri-state boolean algebra (TRUE, FALSE, NULL). This means that if any side of the equality comparison is NULL, the overall result of the comparison is NULL. There are two DQL functions that cover scenarios where missing or NULL records need to be retrieved:

The isTrueOrNull function
The isFalseOrNull function

For example, the below function that uses basic filtering does not provide null or missing records:

dql
fetch logs
| filter log.source != "logsourcename"  // does not provide the records where `log.source` is null or missing

However, using the isTrueOrNull function renders those null and missing values:

dql
fetch logs
| filter isTrueOrNull(log.source != "logsourcename") // also provides the records where `log.source` is null or missing

String operators

By default, all string values in matching expressions are case-sensitive. The caseSensitive parameter provides the ability to change case sensitivity.

For details see, string functions.

Operator	Description	Example (yields true)
`==`	Equals	`"ab" == lower("aB")`
`!=`	Not equals	`"ab" != "aB"`
`<`	Lower	`"b" < "c"`
`<=`	Lower than or equal	`"ab" <= "aB"`
`>`	Greater	`"a" > "A"`
`>=`	Greater than or equal	`"ab" >= "Ab"`

Comparison operators (==, !=)

( ) - false for non-comparable types in case of == operator, true for non-compatible types in case of != operator
( ) - true/false comparable types based on operator
NULL - if one of the operands is NULL
NULL == NULL - null

==, !=	Long	Double	String	Boolean	Timestamp	Duration	Timeframe	Binary	Array	Record
Long
Double
String
Boolean
Timestamp
Duration
Timeframe
Binary
Array
Record

Comparison operators (<, <=, >, >=)

( ) - true/false based on result of operator
( ) - null

<, <=, >, >=	Long	Double	String	Boolean	Timestamp	Duration	Timeframe	Binary	Array	Record
Long
Double
String
Boolean
Timestamp
Duration
Timeframe
Binary
Array
Record

Iterative expressions

Iterative expressions can be used to evaluate every element of a given array or every i-th element of one or more arrays.

iAny

Checks an iterative boolean expression and returns true, if the expression was true at least once, false if it wasn't. For example:

dql
fetch logs
| fieldsAdd a = array(1, 2, 3)
| filter iAny(a[] > 2)

iCollectArray

Collects the results of an iterative expression into an array. For example:

dql
fetch logs
| fieldsAdd a = array(1, 2, 3), b = array(10, 11, 12)
| fieldsAdd iCollectArray(a[] + b[])

Comparison operators

in

The in comparison operator evaluates the occurrence of a value returned by the left side's expression within a list of values returned by the right side's DQL subquery.

Syntax

expression in [execution block]

Usage and constraints

Name	Type	Mandatory	Constraints	Description
left side	expression	yes	Either a field identifier or an expression.	The element to be found in the list returned by the right side's subquery.
right side	execution block	yes	It has to return a single field providing a list of values.	The DQL Subquery which returns the list of values to compare against.

Example

This example shows how to use the in keyword for filtering a host metric for the host's attribute:

dql
timeseries avg(dt.host.cpu.usage), filter:dt.entity.host in [fetch dt.entity.host
 | fieldsAdd tags
 | expand tags
 | filter tags == "ServiceNow" | fields id]