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A comprehensive guide to multiple WITH statements in SQL, perfect for beginners and experts alike.
The SQL clause allows you to define a CTE (common table expression). A CTE is like a table that is populated during query execution.
You can use multiple statements in one SQL query to define multiple CTEs. In this article, we will explain how to define multiple CTEs in a single query. We’ll also show how this approach takes the expressive power of an SQL query to the next level.
Can You Use Multiple WITH Statements in SQL?
Yes!
Below is a simple query using two WITH clauses:
WITH wine_exporting_country AS ( SELECT country FROM product WHERE product_name = ‘wine’ AND qty_exported > 0 ), car_exporting_country AS ( SELECT country FROM product WHERE product_name = ‘car’ AND qty_exported > 0 ) SELECT country FROM wine_exporting_country INTERSECT car_exporting_countryIn the above query, there are two CTEs.
Two select statements in one query for same tableThe first one (in red) is called and the second one (in blue) is . The main query (in black) references both statements as regular tables using . The intersection of the
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