Question

I am writing a program in C# that read and writes to SQLite (System.Data.Sqlite)
I have a table that looks like this

UserID  ProdID  Value1  Value2  TIME
------------------------------------------------
1        1      10      1      2011-06-01 10:20:30.333
1        2      20      3      2011-06-01 10:20:30.444
2        1      100     11     2011-06-01 10:20:30.333
2        2      22      32     2011-06-01 10:20:30.444
1        1      20      2      2011-06-01 10:30:30.333
1        2      30      4      2011-06-01 10:30:30.444
2        1      22      22     2011-06-01 10:30:30.333
2        2      33      44     2011-06-01 10:30:30.444
1        1      10      1      2011-06-02 10:20:30.333
1        2      20      3      2011-06-02 10:20:30.444
2        1      11      11     2011-06-02 10:20:30.333
2        2      22      32     2011-06-02 10:20:30.444
1        1      20      2      2011-06-02 10:30:30.333
1        2      30      4      2011-06-02 10:30:30.444
2        1      22      22     2011-06-02 10:30:30.333
2        2      33      44     2011-06-02 10:30:30.444

I need to get Three things from this for each user.

1) The Last Entry of the day from each product for Value1 and 2 and totaled so its one two values that are the sum of all the products.
ie for user 1 on 2011-06-01 it would be Value1=50 and Value2=6.

curently i use:

SELECT * FROM TickData AS a,;
(SELECT USERID, DATE(TIME) AS JUSTDATE, MAX(TIME) AS MTIME;
FROM TickData;
GROUP BY 1,2;
) AS b;
WHERE a.USERID = b.USERID;
AND a.TIME = b.MTIME;
AND STRFTIME('%Y-%m',a.TIME) = STRFTIME('%Y-%m','NOW');
AND a.USERID = 1;

this returns:

UserID  ProdID  Value1  Value2  TIME
------------------------------------------------
1        1      20      2      2011-06-01 10:30:30.333
1        2      30      4      2011-06-01 10:30:30.444

For 2011-06-01.
Then i loop through the data and add the values when the dates are the same.
Giving me Value1=50 and Value2=6.

2) The Highest Entry for each day of Value1 totaled for all products.
ie for user 2 on 2011-06-01 it would be Value1=133.

UserID  ProdID  Value1  Value2  TIME
------------------------------------------------
2        1      100     11     2011-06-01 10:20:30.333
2        2      33      44     2011-06-01 10:30:30.444

3) The Lowest Entry for each day of Value1 totaled for all products.
ie for user 2 on 2011-06-01 it would be Value1=44.

UserID  ProdID  Value1  Value2  TIME
------------------------------------------------
2        2      22      32     2011-06-01 10:20:30.444
2        1      22      22     2011-06-01 10:30:30.333

I havent had any luck with 2 or 3 yet.

Does anyone have any sugestions

Answer 1

Ok worked it out my self over the weekend

1)

SELECT sum(value1), sum(value2) FROM TickData AS a,
(SELECT USERID, PRODID, DATE(TIME) AS JUSTDATE, MAX(TIME) AS MTIME
FROM TickData
GROUP BY 1,2,3
) AS b
WHERE a.USERID = b.USERID
AND a.TIME = b.MTIME
AND STRFTIME('%Y-%m',a.TIME) = STRFTIME('%Y-%m','NOW')
AND a.USERID = 1
GROUP BY JUSTDATE

2)

SELECT sum(Mval) FROM TickData AS a,
(SELECT USERID, PRODID, DATE(TIME) AS JUSTDATE,ID, MAX(value1) AS Mval
FROM TickData
GROUP BY 1,2,3
) AS b
WHERE a.USERID = b.USERID
AND a.ID = b.ID
AND STRFTIME('%Y-%m',a.TIME) = STRFTIME('%Y-%m','NOW')
AND a.USERID = 2
GROUP BY JUSTDATE

3)

SELECT sum(Mval) FROM TickData AS a,
(SELECT USERID, PRODID, DATE(TIME) AS JUSTDATE,ID, MIN(value1) AS Mval
FROM TickData
GROUP BY 1,2,3
) AS b
WHERE a.USERID = b.USERID
AND a.ID = b.ID
AND STRFTIME('%Y-%m',a.TIME) = STRFTIME('%Y-%m','NOW')
AND a.USERID = 2
GROUP BY JUSTDATE

Edit:
2 and 3 can be done with one query:

SELECT sum(Mval), sum(Mval2) FROM TickData AS a,
(SELECT USERID, PRODID, DATE(TIME) AS JUSTDATE,ID, MAX(PL) AS Mval,MIN(PL) AS Mval2
FROM TickData
GROUP BY 1,2,3
) AS b
WHERE a.USERID = b.USERID
AND a.TIME = b.MTIME
AND STRFTIME('%Y-%m',a.TIME) = STRFTIME('%Y-%m','NOW')
AND a.USERID = 2
GROUP BY JUSTDATE