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Group by without soring


Group by without soring

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masoudk1990
masoudk1990
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Hi, this is initializations:


CREATE TABLE #table1(col1 nvarchar(1), col2 int);

INSERT INTO #table1 VALUES('B','100');
INSERT INTO #table1 VALUES('A','200');
INSERT INTO #table1 VALUES('B','300');
INSERT INTO #table1 VALUES('C','400');



Here is my query:

WITH CTE (col1,col2) as (
SELECT col1, SUM(col2)
FROM #table1
GROUP BY col1
)

SELECT * FROM cte



Here is output:

col1,col2
----------------
A,200
B,400
C,400

Why GROUP BY statement sort my table automatically?
I want to display my table as it is.
Is it possible?

Thank you very much for help.

___________________________________
Computer Enterprise Masoud Keshavarz
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If I go there I've played enough Diablo to know how to fight my way out.
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CREATE TABLE #table1(col1 nvarchar(1), col2 int, OrderMe int);

INSERT INTO #table1 VALUES('B','100',0);
INSERT INTO #table1 VALUES('A','200',1);
INSERT INTO #table1 VALUES('B','300',0);
INSERT INTO #table1 VALUES('C','400',1);


WITH CTE (col1,col2, OrderMe) as (
SELECT col1, SUM(col2), OrderMe
FROM #table1
GROUP BY col1, OrderMe
)

SELECT col1,Col2 FROM cte
ORDER BY OrderMe



Group by isnt' an ordering function, and if you want a specific order on your table, its best to add an ordering key of some kind.
masoudk1990
masoudk1990
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Thank you for reply.
My table have key, problem is if I sort my table with key I have to use it in "GROUP BY" and it generate incorrect output.

See this:

CREATE TABLE #table1(ID INT ,col1 nvarchar(1), col2 int);

INSERT INTO #table1 VALUES(1,'B','100');
INSERT INTO #table1 VALUES(2,'A','200');
INSERT INTO #table1 VALUES(3,'B','300');
INSERT INTO #table1 VALUES(4,'C','400');


WITH CTE (ID,col1,col2) as (
SELECT ID ,col1, SUM(col2)
FROM #table1
GROUP BY col1, ID
)

SELECT col1,Col2 FROM cte
ORDER BY ID



Col1,Col2
---------------
B,100
A,200
B,300
C,400

As you see KEY didn’t allowed me to group my data by Col1

___________________________________
Computer Enterprise Masoud Keshavarz
I don't care about hell.
If I go there I've played enough Diablo to know how to fight my way out.
siggemannen
siggemannen
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Try MIN(ID) in the inner select and it will work i think?
masoudk1990
masoudk1990
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siggemannen (9/14/2013)
Try MIN(ID) in the inner select and it will work i think?


haha yes :-D
Thanks it worked, much appreciated

___________________________________
Computer Enterprise Masoud Keshavarz
I don't care about hell.
If I go there I've played enough Diablo to know how to fight my way out.
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