如何使用公用表表达式将SQL查询转换为一个（对于SQL Server 2000）

Question

I just found an adequate solution to How to Find Rows which are Duplicates by a Key but Not Duplicates in All Columns? , coded the stored procedure, then learned that the database is stuck at SQL Server 2000.

My solution, of course, relies heavily on Common Table Expressions.

Can anyone provide me a set of ru les for converting back to the SQL Server 2000 dialect?

Note that I have things like thisL:

;
WITH CTE1 AS ( ... ),
CTE2 AS (SELECT ... FROM CTE1 ... ),
CTE3 AS (SELECT ... FROM CTE1 INNER JOIN CTE2 ...)
SELECT * FROM CTE3
WHERE criteria
ORDER BY sequence

This would appear to make things more interesting...

---

Update: None of the CTEs are recursive.

Answer 1

Two options (granted, neither are pretty -- that's why we like CTE's)

OPTION 1

Create a temp table ( # , or if small enough @ ) and refer to it as you would the CTE. Drop when you are done.

OPTION 2 Put the entire CTE SELECT as a table in the FROM portion of the query.

SELECT *
FROM  (SELECT *
       FROM table1) oldCTE

Answer 2

I don't think it is possible to come up with rules that would easily convert any cte into a non-cte statement. as the possibilities are too open-ended (particularly if you're working with recursive CTEs). The closest I can think of would be to take each CTE in order, break it into it's own query, and use it to populate a temporary table that's used by the following queries. Hardly efficient, and not guarnateed to work in all possible situations.