如何比较日期和日期范围

Question

I want to calculate Total of Quantity and GROUP BY CarID but am currently unable to do this.

In my database have some tables: TBL_CAR_TX, TBL_CAR, TBL_PERSON

table: TBL_CAR_TX
------------------
select * from TBL_CAR_TX
where TranDate >= '2011-06-09' and Trandate <= '2011-06-20'

    TranID, AccID, CarID, TranDate, Type, Quantity, .....
    --------------------------------------------------------
    0      2563    BMW    2011-06-09   H    -15 (1)
    1      2563    BMW    2011-06-20   R     15
    2      2563    BMW    2011-06-20   H     20
    3      0055    TOY    2011-06-12   H    -10 (2)
    4      0055    TOY    2011-06-20   R     10

...

(H): Hold, (R): Release
if we change the condition of the WHERE stmt:

select * from TBL_CAR_TX where TranDate >= '2011-06-10' and Trandate <= '2011-06-19'  

(these date, I get them from outside) ==> all of the records disappear ==> I can't calculate because the data doesn't display.

Look at the table TBL_CAR_TX, we can see that a person borrow car 'BMW' from '2011-06-09' and until '2011-06-20' he returned it. So If I do in SQL Server 2008, how can I keep the record (1) & (2) in the range date from '2011-06-10' to '2011-06-19' to calculate. If can not, how can I do it in java programming ? Any suggest.

table TBL_CAR:

    MarketID, CarID, Name, Size, ...
    ---------------------------
    GER       BMW    ....
    JPA       TOY    ....

Table TBL_PERSON:

    AccID, Name, Age, DOB, ...
    -------------------------
    2563   Robert
    0055   Mike

Thanks you very much for your help

Answer 1

I want to calculate Total of Quantity and GROUP BY CarID but am currently unable to do this. So If I do in SQL Server 2008, how can I keep the record (1) & (2) in the range date from '2011-06-10' to '2011-06-19' to calculate.

Just get rid of = from your SQL.

select CarID, SUM(QUANTITY) from TBL_CAR_TX where TranDate > '2011-06-09' and Trandate < '2011-06-20' GROUP BY CarID

or use BETWEEN SQL CLAUSE.

select CarID, SUM(QUANTITY) from TBL_CAR_TX where TranDate BETWEEN '2011-06-10' AND '2011-06-19' GROUP BY CarID

If can not, how can I do it in java programming ?

You can definitely filter out the data in java but there is no point in doing so when SQL can do the work for you. Unless it is a massive performance penalty, it is almost always worth doing the processing like this in SQL.