Topmusicanswers
- What are the functions of the string?
- IS NULL function in Presto?
- What is varchar in Presto?
- What is Presto format?
What are the functions of the string?
Introduction to string functions
| Function | What It Does |
|---|---|
| strcpy() | Copies (duplicates) one string to another. |
| strncpy() | Copies a specific number of characters from one string to another. |
| strlen() | Returns the length of a string, not counting the or NULL character at the end of the string. |
IS NULL function in Presto?
GREATEST and LEAST
Like most other functions in Presto, they return null if any argument is null. Note that in some other databases, such as PostgreSQL, they only return null if all arguments are null.
What is varchar in Presto?
VARCHAR. Variable length character data with an optional maximum length.
What is Presto format?
Presto is a SQL based querying engine that uses an MPP architecture to scale out. Because it is a querying engine only, it separates compute and storage relying on connectors to integrate with other data sources to query against.
