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SQL Server equivalent to Oracle CONNECT BY and LEVEL pseudocolumn [duplicate]

Please help converting Oracle query to SQL Server equivalent:

SELECT (LEVEL+1-1) AS lvl 
  FROM dual
CONNECT BY LEVEL <= 10
/

The output is numbers from 1 to 10:

LVL
----
1
2
3
...
10

I know there is hierarchy methods in SQL Server and built-ins like GetLevel and more. Can this be used to get the same results?

To create dual table if needed (not sure) - copied from here:http://blog.sqlauthority.com/2010/07/20/sql-server-select-from-dual-dual-equivalent/

CREATE TABLE DUAL
(
DUMMY VARCHAR(1)
)
GO
INSERT INTO DUAL (DUMMY)
VALUES ('X')
GO

Specifically looking for examples that would let use smth. like LEVEL in queries. For example: there is only one start date in the table - 4/22/2013. But with LEVEL I'm able to increment it as follows:

SELECT start_date, start_date+LEVEL-1 AS start_date_btwn
  FROM my_tab
 WHERE id = 1
CONNECT BY LEVEL<=10
/

START_DATE    START_DATE_BTWN
------------------------------
4/22/2013    4/22/2013
4/22/2013    4/23/2013
4/22/2013    4/24/2013
4/22/2013    4/25/2013
......
4/22/2013    4/30/2013

Thank you very much to all in advance.

like image 898
Art Avatar asked Feb 22 '13 19:02

Art


1 Answers

One way I've done it in the past is querying spt_values like this:

SELECT number
FROM master..spt_values
WHERE 
    type = 'P'
    AND number <= 255

However, it doesn't have a full list of numbers. An alternative option would be to create a Recursive CTE like such:

WITH CTE AS (
  SELECT 1 as Number
  UNION ALL
  SELECT Number+1
  FROM CTE 
  WHERE Number < 100 
)
SELECT * FROM CTE

SQL Fiddle Demo

like image 170
sgeddes Avatar answered Sep 21 '22 09:09

sgeddes