[JacKTrocinskI]

CTEs are just a nicer, more readable way of writing a subquery. Also, CTEs can be recursive. In Postgres, CTEs can be useful when used with the RETURNING clause. If you're using the same CTE in multiple different queries, then consider creating a view instead. I wouldn’t use a CTE for lookup values, create a lookup table instead.

[alexisread]

Not only that, but in Postgres you can do updates in the CTEs, and chain them together eg.

WITH CTE1 AS ( SELECT.... ) CTE2 AS ( INSERT....RETURNING insertid ) INSERT INTO TABLE2 insertid as FK, otherdata...

The CTEs are executed in define-order as a single complete transaction, no need to use multiple calls to insert relational data