Write a query in SQL that sums up the total number of books in the database.
Table name: books
Table column: number_of_books
```SQL
SELECT SUM(number_of_books) 
FROM books;
```
Complete the following task based on the instruction and optional input provided.### Instruction:
Write a query in SQL that sums up the total number of books in the database.

### Input:
Table name: books
Table column: number_of_books

### Output:
```SQL
SELECT SUM(number_of_books) 
FROM books;
```