Tag: common-table-expression

How To Write A Query With A CTE And A Left Join

I am trying to have a calendar table with my CTE and set it up so that my dates in my query display like this Jan 18Jan 19Feb 18Feb 19 Now this is my DDL and this is the query I attempted, but in …

How to create indexed view of children count

I am trying to take a table with a parent child relationship and get the number of children. I would like to create an indexed view of the number of children by utilizing COUNT_BIG(*). The problem is …

SQL Continuous Date Ranges Previously Grouped Data

I’m working with a data extract that represents claims data for a population. The ultimate goal is to be able to associate specific claims to unique encounters. The way we’d define an encounter is a …

Daily snapshot table using cte loop

I need daily snapshot of how many employees are employed on any given day (defined as @date between Start_Date & End_Date), with one line per date. At one point, the below script would return all …

Update statement SQL with CTE

I have a common table expression that I am using trying to use as an update statement. The only reason for the CTE is so I can use a where clause to filter by CredCount. I would like to use that where clause to update only records that match in this case CredCount of 2. However, I am having trouble

Creating a CTE in Oracle

I am trying to create a CTE in Oracle that doesn’t select from an existing table but instead has data inserted into it. Currently, I am creating a table and then dropping it after the query is done. …

WITH in BigQuery

Does BigQuery support the WITH clause? I don’t like formatting too many subqueries. For example: WITH alias_1 AS (SELECT foo1 c FROM bar) , alias_2 AS (SELECT foo2 c FROM bar a, alias_1 b WHERE b.c =…

How to use CTE’s with update/delete on SQLite?

SQLite now has CTEs, and the documentation says you can use it with insert, update and delete queries — but only gives examples of select statements. I can figure out how CTEs apply to inserts, via insert-select; but how can we use them in update or delete, where there is no from-clause? Answer CTEs can be used in subqueries:

Use SQL Server recursive common table expression to get full path of all files in a folder(with subfolders)

There is a SQL Server undocumented extended stored procedure called xp_dirtree, which can return all files and folders name (include subfolders) in a table format. To practice my understanding of …