AS_FLOAT
Strict casting VARIANT
values to DOUBLE data type.
If the input data type is not VARIANT
, the output is NULL
.
If the type of value in the VARIANT
does not match the output value, the output is NULL
.
Syntax
AS_FLOAT( <variant> )
Arguments
Arguments | Description |
---|---|
<variant> | The VARIANT value |
Return Type
DOUBLE
Examples
SELECT as_float(parse_json('12.34'));
+-------------------------------+
| as_float(parse_json('12.34')) |
+-------------------------------+
| 12.34 |
+-------------------------------+
SELECT as_float(parse_json('123'));
+-----------------------------+
| as_float(parse_json('123')) |
+-----------------------------+
| 123.0 |
+-----------------------------+
-- Returns NULL for non-numeric values
SELECT as_float(parse_json('"abc"'));
+-------------------------------+
| as_float(parse_json('"abc"')) |
+-------------------------------+
| NULL |
+-------------------------------+