BOOL
Syntax
BOOL( expression )
Description
Converts the expression expression to Boolean type according to the following rules:
| Type | FALSE |
TRUE |
|---|---|---|
Fractional number | Integer |
0, 0.0 |
All others |
String |
Empty string ("") |
All others |
Boolean |
FALSE |
TRUE |
Date | Datetime |
- | TRUE |
Argument types:
expression—Boolean | Date | Datetime | Fractional number | Geopoint | Geopolygon | Integer | String
Return type: Boolean
Examples
BOOL(0) = FALSE
BOOL(#2019-04-04#) = TRUE
BOOL("Lorem ipsum") = TRUE
Data source support
ClickHouse 21.8, Microsoft SQL Server 2017 (14.0), MySQL 5.7, Oracle Database 12c (12.1), PostgreSQL 9.3, YDB.