BOOL
Type conversion functions
Syntax
BOOL( expression )
Description
Converts the expression expression to Boolean type according to the following rules:
| Type | FALSE |
TRUE |
|---|---|---|
Number |
0, 0.0 |
All others |
String |
Empty string ("") |
All others |
Boolean |
FALSE |
TRUE |
Date | Datetime |
- | TRUE |
Argument types:
expression—Any
Return type: Boolean
Examples
BOOL(0) = FALSE
BOOL(#2019-04-04#) = TRUE
BOOL("Lorem ipsum") = TRUE
Data source support
Materialized Dataset, ClickHouse 1.1, Microsoft SQL Server 2017 (14.0), MySQL 5.6, PostgreSQL 9.3