WITH Clause¶
Important
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Confluent Cloud for Apache Flink®️ enables writing auxiliary statements to use in larger SQL queries.
Syntax¶
WITH <with_item_definition> [ , ... ]
SELECT ... FROM ...;
<with_item_defintion>:
with_item_name (column_name[, ...n]) AS ( <select_query> )
Description¶
The WITH clause provides a way to write auxiliary statements for use in a
larger query. These statements, which are often referred to as Common Table
Expressions (CTE), can be thought of as defining temporary views that exist just
for one query.
Example¶
The following example defines a common table expression
orders_with_total and uses it in a GROUP BY query.
WITH orders_with_total AS (
SELECT order_id, price + tax AS total
FROM orders
)
SELECT order_id, SUM(total)
FROM orders_with_total
GROUP BY order_id;