How do you aggregate the deltas between two arbitrary datetime columns?
0
Please look at the columns and types of a table called History:
- id PRIMARY KEY
- account_id STRING
- total_spent FLOAT
- date_created DATETIME
Sample data for this table:
(id, account_id, total_spent, date_created)
(1, '123-456-7890', 10, 2018-10-01 00:00:00+08)
(2, '123-456-7890', 20, 2018-10-02 00:00:00+08)
(3, '123-456-7890', 30, 2018-10-04 00:00:00+08)
If I have to find out the money spent by account 123-456-7890 between 2018-10-01 00:00:01+08 and 2018-10-02 00:00:01+08:
- let A = the latest total_spent before
2018-10-01 00:00:01+08
- let B = the latest total_spent before
2018-10-02 00:00:01+08
- Subtract B - A = 10.
If I have to find the amount of money spent by account 123-456-7890 between 2018-10-03 00:00:01+08 and 2018-10-04 00:00:01+08:
- A will be 20 since that is the latest row before
2018-10-03 00:00:01+08
- B will be 30
- Thus answer is 10 as well.
Questions:
- Given this schema, how do you calculate the total amount of money spent by all accounts between two datetime?
- If I am interested to calculate spending for accounts between two arbitrary datetime, how can I restructure my schema to make my life easier?
database postgresql database-design window-functions
asked Nov 12 '18 at 22:33
Sparrowcide
1,10211332
add a comment |
0
Please look at the columns and types of a table called History:
- id PRIMARY KEY
- account_id STRING
- total_spent FLOAT
- date_created DATETIME
Sample data for this table:
(id, account_id, total_spent, date_created)
(1, '123-456-7890', 10, 2018-10-01 00:00:00+08)
(2, '123-456-7890', 20, 2018-10-02 00:00:00+08)
(3, '123-456-7890', 30, 2018-10-04 00:00:00+08)
If I have to find out the money spent by account 123-456-7890 between 2018-10-01 00:00:01+08 and 2018-10-02 00:00:01+08:
- let A = the latest total_spent before
2018-10-01 00:00:01+08
- let B = the latest total_spent before
2018-10-02 00:00:01+08
- Subtract B - A = 10.
If I have to find the amount of money spent by account 123-456-7890 between 2018-10-03 00:00:01+08 and 2018-10-04 00:00:01+08:
- A will be 20 since that is the latest row before
2018-10-03 00:00:01+08
- B will be 30
- Thus answer is 10 as well.
Questions:
- Given this schema, how do you calculate the total amount of money spent by all accounts between two datetime?
- If I am interested to calculate spending for accounts between two arbitrary datetime, how can I restructure my schema to make my life easier?
database postgresql database-design window-functions
asked Nov 12 '18 at 22:33
Sparrowcide
1,10211332
Please see How to Ask & hits googling 'stackexhange homework'--show what parts you can do & some understanding of relevant aggregation basics & what that suggests here. Parts that you list are faqs, google for them first.
– philipxy
Nov 13 '18 at 0:33
add a comment |
0
0
0
Please look at the columns and types of a table called History:
- id PRIMARY KEY
- account_id STRING
- total_spent FLOAT
- date_created DATETIME
Sample data for this table:
(id, account_id, total_spent, date_created)
(1, '123-456-7890', 10, 2018-10-01 00:00:00+08)
(2, '123-456-7890', 20, 2018-10-02 00:00:00+08)
(3, '123-456-7890', 30, 2018-10-04 00:00:00+08)
If I have to find out the money spent by account 123-456-7890 between 2018-10-01 00:00:01+08 and 2018-10-02 00:00:01+08:
- let A = the latest total_spent before
2018-10-01 00:00:01+08
- let B = the latest total_spent before
2018-10-02 00:00:01+08
- Subtract B - A = 10.
If I have to find the amount of money spent by account 123-456-7890 between 2018-10-03 00:00:01+08 and 2018-10-04 00:00:01+08:
- A will be 20 since that is the latest row before
2018-10-03 00:00:01+08
- B will be 30
- Thus answer is 10 as well.
Questions:
- Given this schema, how do you calculate the total amount of money spent by all accounts between two datetime?
- If I am interested to calculate spending for accounts between two arbitrary datetime, how can I restructure my schema to make my life easier?
database postgresql database-design window-functions
asked Nov 12 '18 at 22:33
Sparrowcide
1,10211332
Please look at the columns and types of a table called History:
- id PRIMARY KEY
- account_id STRING
- total_spent FLOAT
- date_created DATETIME
Sample data for this table:
(id, account_id, total_spent, date_created)
(1, '123-456-7890', 10, 2018-10-01 00:00:00+08)
(2, '123-456-7890', 20, 2018-10-02 00:00:00+08)
(3, '123-456-7890', 30, 2018-10-04 00:00:00+08)
If I have to find out the money spent by account 123-456-7890 between 2018-10-01 00:00:01+08 and 2018-10-02 00:00:01+08:
- let A = the latest total_spent before
2018-10-01 00:00:01+08
- let B = the latest total_spent before
2018-10-02 00:00:01+08
- Subtract B - A = 10.
If I have to find the amount of money spent by account 123-456-7890 between 2018-10-03 00:00:01+08 and 2018-10-04 00:00:01+08:
- A will be 20 since that is the latest row before
2018-10-03 00:00:01+08
- B will be 30
- Thus answer is 10 as well.
Questions:
- Given this schema, how do you calculate the total amount of money spent by all accounts between two datetime?
- If I am interested to calculate spending for accounts between two arbitrary datetime, how can I restructure my schema to make my life easier?
database postgresql database-design window-functions
database postgresql database-design window-functions
asked Nov 12 '18 at 22:33
Sparrowcide
1,10211332
asked Nov 12 '18 at 22:33
Sparrowcide
1,10211332
asked Nov 12 '18 at 22:33
Sparrowcide
1,10211332
asked Nov 12 '18 at 22:33
Sparrowcide
1,10211332
asked Nov 12 '18 at 22:33
Sparrowcide
1,10211332
1,10211332
Please see How to Ask & hits googling 'stackexhange homework'--show what parts you can do & some understanding of relevant aggregation basics & what that suggests here. Parts that you list are faqs, google for them first.
– philipxy
Nov 13 '18 at 0:33
add a comment |
Please see How to Ask & hits googling 'stackexhange homework'--show what parts you can do & some understanding of relevant aggregation basics & what that suggests here. Parts that you list are faqs, google for them first.
– philipxy
Nov 13 '18 at 0:33
Please see How to Ask & hits googling 'stackexhange homework'--show what parts you can do & some understanding of relevant aggregation basics & what that suggests here. Parts that you list are faqs, google for them first.
– philipxy
Nov 13 '18 at 0:33
Please see How to Ask & hits googling 'stackexhange homework'--show what parts you can do & some understanding of relevant aggregation basics & what that suggests here. Parts that you list are faqs, google for them first.
– philipxy
Nov 13 '18 at 0:33
add a comment |
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Please see How to Ask & hits googling 'stackexhange homework'--show what parts you can do & some understanding of relevant aggregation basics & what that suggests here. Parts that you list are faqs, google for them first.
– philipxy
Nov 13 '18 at 0:33