2.4. Conversion Functions
Presto will implicity convert numeric and character values to the correct type if such a conversion is possible. Presto will not convert between character and numeric types. For example, a query that expects a varchar will not automatically convert a bigint value to an equivalent varchar.
When necessary, values can be explicitly cast to a particular type.
Conversion Functions
- CAST(value AS type) → type
Explicitly cast a value as a type. This can be used to cast a varchar to a numeric value type and vice versa.