spark sql with as

"WITH" clause, also known as Common Table Expression (CTE), is a feature in Spark SQL that allows you to define named temporary result sets that can be used in a subsequent SQL statement. The syntax for using WITH clause in Spark SQL is as follows:

WITH temp_table AS (
  SELECT ...
  FROM ...
  WHERE ...
)
SELECT ...
FROM ...
JOIN temp_table ON ...

In the above example, the WITH clause defines a temporary table named "temp_table" with a SELECT statement. This temporary table can then be used in the subsequent SELECT statement or in a JOIN operation.

Using WITH clause can make your SQL code more readable and maintainable by breaking down complex queries into smaller, more manageable pieces. It is particularly useful when you need to reuse the same subquery multiple times in a larger query.