Type conversion functions
BOOL
Syntax:BOOL( expression )
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 |
DATE
Syntax:DATE( expression [ , timezone ] )
Converts the expression expression to date format.
The date must be in the format YYYY-MM-DD.
If expression is a number, then the timezone option can be used to convert the date to the specified time zone.
DATE_PARSE
Syntax:DATE_PARSE( value )
Converts the value expression to date format. Unlike DATE, it supports multiple formats.
DATETIME
Syntax:DATETIME( expression [ , timezone ] )
Converts the expression expression to date and time format. When converting Date to DateTime, the time is set to '00:00:00'.
The date must be in the format YYYY-MM-DDThh:mm:ss or YYYY-MM-DD hh:mm:ss.
If expression is a number, then the date and time can be converted to the specified time zone when the timezone option is available.
DATETIME_PARSE
Syntax:DATETIME_PARSE( value )
Converts the value expression to date and time format. Unlike DATETIME, it supports multiple formats.
DB_CAST
Syntax:DB_CAST( expression, native_type [ , param_1 [ , param_2 ] ] )
Converts the expression expression to database's native type native_type.
The following type casts are supported:
| Data source | Data type | Native data type | Parameters for native type | Comment |
|---|---|---|---|---|
ClickHouse |
Fractional number |
Float32 |
||
ClickHouse |
Fractional number |
Float64 |
||
ClickHouse |
Fractional number |
Decimal |
Integer, Integer |
|
ClickHouse |
Integer |
Int8 |
||
ClickHouse |
Integer |
Int16 |
||
ClickHouse |
Integer |
Int32 |
||
ClickHouse |
Integer |
Int64 |
||
ClickHouse |
Integer |
UInt8 |
||
ClickHouse |
Integer |
UInt16 |
||
ClickHouse |
Integer |
UInt32 |
||
ClickHouse |
Integer |
UInt64 |
||
ClickHouse |
String |
String |
||
PostgreSQL |
Fractional number |
double precision |
||
PostgreSQL |
Fractional number |
real |
||
PostgreSQL |
Fractional number |
numeric |
Integer, Integer |
|
PostgreSQL |
Integer |
smallint |
||
PostgreSQL |
Integer |
integer |
||
PostgreSQL |
Integer |
bigint |
||
PostgreSQL |
String |
text |
||
PostgreSQL |
String |
character |
Integer |
Alias: char |
PostgreSQL |
String |
character varying |
Integer |
Alias: varchar |
PostgreSQL |
String |
char |
Integer |
Alias for character |
PostgreSQL |
String |
varchar |
Integer |
Alias for character varying |
FLOAT
Syntax:FLOAT( expression )
Converts the expression expression to fractional number format according to the following rules:
| Type | Value |
|---|---|
Fractional number | Integer |
Original value. |
Date | Datetime |
Unix time corresponding to the date and time. If the value contains time zone data, it's used in the calculation. If the time zone is unknown, the time is set in UTC. |
String |
A number from a decimal string. |
Boolean |
TRUE — 1.0, FALSE — 0.0. |
GEOPOINT
Syntax:GEOPOINT( value_1 [ , value_2 ] )
Generates a Geopoint type value. For the input, it accepts a string, a "geopoint" type value, or coordinates — latitude value_1 and longitude value_2. If a single string is input, it must contain a list of two numbers (latitude and longitude) in JSON syntax.
GEOPOLYGON
Syntax:GEOPOLYGON( value )
Converts the value expression to geopolygon format.
INT
Syntax:INT( expression )
Converts the expression expression to integer format according to the following rules:
| Type | Value |
|---|---|
Integer |
Original value. |
Fractional number |
Integer part of the number (rounded down). |
Date | Datetime |
Unix time corresponding to the date and time. If the value contains time zone data, it's used in the calculation. If the time zone is unknown, the time is set in UTC. |
String |
A number from a decimal string. |
Boolean |
TRUE — 1, FALSE — 0. |
STR
Syntax:STR( expression )
Converts the expression expression to string type.