ISNULL
Syntax
As a function
ISNULL( expression )
As an operator
expression IS [ NOT ] NULL
Description
Returns TRUE if expression is NULL, otherwise returns FALSE.
expression IS NOT NULL returns the opposite result.
Argument types:
expression—Any
Return type: Boolean
Example
| [sales] | ISNULL([sales]) | [sales] IS NULL | [sales] IS NOT NULL |
|---|---|---|---|
432.40 |
False |
False |
True |
77.00 |
False |
False |
True |
12000.00 |
False |
False |
True |
NULL |
True |
True |
False |
34.25 |
False |
False |
True |
128.00 |
False |
False |
True |
0.00 |
False |
False |
True |
NULL |
True |
True |
False |
Data source support
ClickHouse 19.13, Microsoft SQL Server 2017 (14.0), MySQL 5.6, Oracle Database 12c (12.1), PostgreSQL 9.3, YDB.