delete records if 2 counts match - sql

Question

I have the following table with data
+---------+--------+--------+
| Trans | Status | Step |
+---------+--------+--------+
| ABCDE | Comple | 1
+---------+--------+--------+
| ABCDE | Error | 2
+---------+--------+--------+
| FGHIJ | Comple | 1
+---------+--------+--------+
| FGHIJ | Comple | 2
+---------+--------+--------+
| KLMNO | Comple | 1
+---------+--------+--------+
| KLMNO | Comple | 2
+---------+--------+--------+
I only want to delete the records where the count of trans and status = 'comple' is the same as count of trans
I could probably do a cursor and loop but that is something I don't want to do.
Thinking along the lines of a having count but probably miles off.
Thanks
I just want to delete FGHIJ and KLMNO as I know all the steps completed.
I want to keep abcde as not all steps completed

Answer 1

Is this what you want?
--delete
select *
from yourtable t
where not exists
(
select 1
from yourtable t2
where t1.Trans=t2.Trans
and status<>'Comple'
)
Use it as it is first to make sure this is what you want to remove, then comment out the SELECT and uncomment the delete

Answer 2

DELETE FROM tbl
WHERE Trans IN ( SELECT trans
FROM tbl
GROUP BY Trans
HAVING COUNT(*) = SUM(CASE WHEN status = 'Comple' THEN 1 ELSE 0 END) )
It deletes rows (by filtering on Trans), where the number of rows in a group of trans is equal to the number of rows in this group with the Comple status
http://sqlfiddle.com/#!18/1768b/10

Answer 3

Try this
DECLARE #Data AS TABLE (Trans Varchar(10) , Status Varchar(10) , Step INT )
INSERT INTO #Data
SELECT 'ABCDE', 'Comple' , 1 UNION ALL
SELECT 'ABCDE', 'Error' , 2 UNION ALL
SELECT 'FGHIJ', 'Comple' , 1 UNION ALL
SELECT 'FGHIJ', 'Comple' , 2 UNION ALL
SELECT 'KLMNO', 'Comple' , 1 UNION ALL
SELECT 'KLMNO', 'Comple' , 2
SELECT * FROM #Data
;WITH CTe
AS
(
SELECT * , ROW_NUMBER()OVER(PArtition by Trans , [Status] ORDER BY Trans) AS TwocountsMatch
FROM #Data
)
DELETE FROM CTe WHERE TwocountsMatch=2 AND [Status]='Comple'
SELECT * FROM #Data
Demo Result :http://rextester.com/TYK92230

Answer 4

If I understand you correctly, you want to delete all of a [Trans] rows, if all of those rows [status] are 'Comple'?
DECLARE #Data AS TABLE (Trans Varchar(10) , Status Varchar(10) , Step INT )
INSERT INTO #Data
SELECT 'ABCDE', 'Comple' , 1 UNION ALL
SELECT 'ABCDE', 'Error' , 2 UNION ALL
SELECT 'FGHIJ', 'Comple' , 1 UNION ALL
SELECT 'FGHIJ', 'Comple' , 2 UNION ALL
SELECT 'KLMNO', 'Comple' , 1 UNION ALL
SELECT 'KLMNO', 'Comple' , 2
SELECT * FROM #Data;
WITH
summarised
AS
(
SELECT
* ,
COUNT(*) OVER (PARTITION BY [trans] ) AS count_trans,
COUNT(*) OVER (PARTITION BY [trans], [status]) AS count_trans_status
FROM
#Data
)
DELETE
summarised
WHERE
[status] = 'Comple'
AND count_trans = count_trans_status
;
SELECT * FROM #Data