How do you aggregate the deltas between two arbitrary datetime columns?

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?

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 |

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?

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 |

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?

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

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

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

add a comment |

active

oldest

votes

Your Answer

StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");

StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});

}
});

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53271060%2fhow-do-you-aggregate-the-deltas-between-two-arbitrary-datetime-columns%23new-answer', 'question_page');
}
);

Post as a guest

Name

Required, but never shown

active

oldest

votes

draft saved

draft discarded

Thanks for contributing an answer to Stack Overflow!

Please be sure to answer the question. Provide details and share your research!

But avoid …

Asking for help, clarification, or responding to other answers.

Making statements based on opinion; back them up with references or personal experience.

To learn more, see our tips on writing great answers.

Some of your past answers have not been well-received, and you're in danger of being blocked from answering.

Please pay close attention to the following guidance:

Please be sure to answer the question. Provide details and share your research!

But avoid …

Asking for help, clarification, or responding to other answers.

Making statements based on opinion; back them up with references or personal experience.

To learn more, see our tips on writing great answers.

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Name

Required, but never shown

Name

Required, but never shown

This page is only for reference, If you need detailed information, please check here

搜尋此網誌

Vfrdtyky