CODEWITHSUNDEEP
sqlsql-serversql-server-2005t-sql
Mt Kr
Mt Kr

Reputation: 129

update of a column based on max date and group by

i have three tables orders, orders_delivered, orders_delivered_sta and the data in the three tables look like

table orders

orders_id 
 10
 11                      
 12
 13

table orders_delivered

orders_delivered_id    orders_id
       10                 1000                                  
       10                 1001                                  
       11                 1002                            
       12                 1003
       12                 1004
       13                 1005 
       13                 1006
       13                 1007

table orders_delivered_sta

  orders_delivered_sta_id   orders_delivered_id   date     now_ind
            1                  1000             02/11/2011   0
            2                  1000             01/10/2006   0
            3                  1000             09/13/2011   0
            4                  1001             01/19/2010   0
            5                  1001             02/21/2011   0
            6                  1002             02/11/2009   0
            7                  1002             08/27/2010   0
            8                  1003             07/15/2012   0
            9                  1004             03/09/2007   0
            10                 1010             10/01/2010   0
            11                 1011             03/27/2011   0
            12                 1012             07/25/2010   0
            13                 1013             09/18/2004   0

so i need to update orders_delivered_sta table such that now_ind should be 1 for the max date of one orders_delivered_id like for one orders_delivered_id 1000 the max date is 09/13/2011 for this set of orders_delivered_id and date (1000,09/13/2011) the now_ind should be 1 and if the column orders_delivered_id has one and only one id then that should be changed to 1

there is some data in orders_delivered_sta table which are not in orders and orders_delivered tables those need not to be changed. the orders_delivered_id which are in oreders_delivered table only needs to change

so the desired output should look like

table orders_delivered_sta

 orders_delivered_sta_id   orders_delivered_id   date     now_ind
            1                  1000             02/11/2011   0
            2                  1000             01/10/2006   0
            3                  1000             09/13/2011   1
            4                  1001             01/19/2010   0
            5                  1001             02/21/2011   1
            6                  1002             02/11/2009   0
            7                  1002             08/27/2010   1
            8                  1003             07/15/2012   1
            9                  1004             03/09/2007   1
           10                 1010             10/01/2010   0
           11                 1011             03/27/2011   0
           12                 1012             07/25/2010   0
           13                 1013             09/18/2004   0

table structure:

create table orders
(
 order_id int primary key  
)

insert into orders select 10
insert into orders select 11                      
insert into orders select 12
insert into orders select 13

create table orders_delivered
( 
  orders_delivered_id int primary key, 
   orders_id int FOREIGN KEY(orders_id)REFERENCES orders (orders_id)
)
insert into orders_delivered select   1000,10                                  
insert into orders_delivered select   1001,10                                  
insert into orders_delivered select   1002,11                            
insert into orders_delivered select   1003,12
insert into orders_delivered select   1004,12
insert into orders_delivered select   1005,13 
insert into orders_delivered select   1006,13
insert into orders_delivered select   1007,13

create table orders_delivered_sta
( 
  orders_delivered_sta_id int primary key, 
   orders_delivered_id int FOREIGN KEY(orders_delivered_id)REFERENCES orders_delivered (orders_delivered_id), 
   date char(10),
  now_ind int
)

insert into orders_delivered_sta select 1,1000,'02/11/2011', 0
insert into orders_delivered_sta select 2,1000,'01/10/2006', 0
insert into orders_delivered_sta select 3,1000,'09/13/2011', 0
insert into orders_delivered_sta select 4,1001,'01/19/2010', 0
insert into orders_delivered_sta select 5,1001,'02/21/2011', 0
insert into orders_delivered_sta select 6,1002,'02/11/2009', 0
insert into orders_delivered_sta select 7,1002,'08/27/2010', 0
insert into orders_delivered_sta select 8,1003,'07/15/2012', 0
insert into orders_delivered_sta select 9,1004,'03/09/2007', 0
insert into orders_delivered_sta select 10,1010,'10/01/2010', 0
insert into orders_delivered_sta select 11,1011,'03/27/2011', 0
insert into orders_delivered_sta select 12,1012,'07/25/2010', 0
insert into orders_delivered_sta select 13,1013,'09/18/2004', 0

Upvotes: 5

Views: 10076

Answers (3)

Andriy M
Andriy M

Reputation: 77657

You could use a CTE and a window MAX():

;
WITH max_dates AS (
  SELECT
    *,
    max_date = MAX(date) OVER (PARTITION BY orders_delivered_id)
  FROM orders_delivered_sta
  WHERE orders_delivered_id IN (SELECT orders_delivered_id FROM orders_delivered)
)
UPDATE max_dates
SET now_ind = 1
WHERE date = max_date

References:

Upvotes: 6

pistipanko
pistipanko

Reputation: 775

Try this:

UPDATE    orders_delivered_sta
SET       now_ind = 1
WHERE     orders_delivered_sta_id IN(
          SELECT     orders_delivered_sta_id
          FROM       (
                      SELECT     orders_delivered_sta_id,
                                 ROW_NUMBER() OVER(PARTITION BY orders_delivered_id ORDER BY date DESC) AS num
                      FROM       orders_delivered_sta) AS T
          WHERE      T.num = 1)

Upvotes: 1

Mosty Mostacho
Mosty Mostacho

Reputation: 43434

This is the query in MySQL, but translating it to SQL-Server should be straight forward as I am using plain SQL. Notice I have changed the date to be in a different form (YYYY-MM-DD) to avoid castings from string to date.

update t3
set t3.now_ind = 1
where t3.orders_delivered_sta_id in (
    select distinct t1.orders_delivered_sta_id from t1
    left join (
        select t2.orders_delivered_id, max(t2.adate) as MaxDate from t2
        group by t2.orders_delivered_id
    ) t2 on (t1.orders_delivered_id = t2.orders_delivered_id) and (t1.adate = t2.MaxDate)
    where t2.orders_delivered_id is not null
) and exists (
    select * from o1
    join od1 on (o1.order_id = od1.orders_delivered_id)
    where (t3.orders_delivered_id = od1.orders_id)
)

Here is an example

Hope this helps

PS: You did need those 3 tables... I'll read questions better next time :)

Upvotes: 0

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