Presto 0.73 Documentation

2.4. Conversion Functions

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.