Re: Query writing

Please provide the work you have done to try to answer these questions.  Yes, this is a help forum but, as far as I know, it isn't a 'we'll do your homework for you' forum.


David Fitzjarrell




On Wednesday, December 18, 2013 1:47 PM, Arif Gulzar <gulzar.arif_at_gmail.com> wrote:
  
Please forward me following 2 quires. Thanks in advance.


Q1: Given the following table of transactions in a cash register:
id| trade_time | amount 
-- ---------------- ------
1| 06/16/2013 11:43| 52.00
2| 06/16/2013 11:50| 142.74
3| 06/16/2013 14:21| -43.89
4| 06/17/2013 12:50| 36.85
5| 06/17/2013 13:40|-523.58 
please write a query which selects net daily turnovers (arithmetical sums of all transactions for a day) for all days when these turnovers are positive.


Q2: Given the following two tables: 

clients (id (PK), name)
transactions (id (PK), client_id, trans_date, debit, credit, comment)
transactions.client_id references clients.id

please write a query which selects the balance for ALL clients, even if they have no transactions. (Assume initial balances to be zeros).
Sample table contents:

clients: 
id name
-- ------
1 John
2 Mary
3 Alex

transactions:
id client_id trans_date debit credit comment
-- --------- ---------- ------- ------- ----------------- 
1 | 1 06/16/2013 NULL 1000.00 SALARY
2 | 1 06/18/2013 516.43 0.00 MOB PHONE PAYMENT
3 | 2 06/16/2013 NULL 1000.00 SALARY
4 | 2 06/18/2013 200.00 NULL INTERNET PAYMENT
5 | 2 06/18/2013 500.00 0.00 MOB PHONE PAYMENT 

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