Question

I have a table that has multiple payments occuring on different dates each month. I would like the query to return a row for each individual payment and in that same row return the SUM of all payments for that month/year.

My table structure is:

   tbl_or_Distri
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `investment_id` int(11) NOT NULL,
  `inv_distri_id` int(11) NOT NULL,
  `trade_date` datetime NOT NULL,
  `pay_date` datetime NOT NULL,
  `amount` double NOT NULL,
  `perc_return` double NOT NULL,
   PRIMARY KEY (`id`),

My current inner query is:

SELECT
 `investment_id`,
 SUM(`perc_return`) as perc_return,
 SUM(`capital_return`) as capital_return,
 SUM(amount) as TotalAmount, 
 CONCAT(MONTH(pay_date), " ", YEAR(pay_date)) as short_date,
 MONTH(pay_date) as pay_month,
 YEAR(pay_date) as pay_year
FROM `tbl_or_distri`
WHERE investment_id=29
GROUP BY YEAR(pay_date), MONTH(pay_date)

The sum(amount), sum(perc_return), and short_date are the 3 records I need returned in each row of the main outer query. The outer query is:

SELECT
 `investment_id`,
  amount,
  pay_date
FROM `tbl_or_distri`
WHERE investment_id=29

How can I combine these two queries into one? While maintaining good performance?
Thank you!

Answer 1

U could create a view for your inner query.

CREATE VIEW NameYourView AS
SELECT
 `investment_id`,
 SUM(`perc_return`) as perc_return,
 SUM(`capital_return`) as capital_return,
 SUM(amount) as TotalAmount, 
 CONCAT(MONTH(pay_date), " ", YEAR(pay_date)) as short_date,
 MONTH(pay_date) as pay_month,
 YEAR(pay_date) as pay_year
FROM `tbl_or_distri`
GROUP BY YEAR(pay_date), MONTH(pay_date)

And then use the view in your outer query.

SELECT t.investment_id, t.amount, t.pay_date, v.*
FROM `tbl_or_distri` t
inner join NameYourView v on v.investment_id = t.investment_id
WHERE t.investment_id=29

I don’t know what it does with performance but it would definitely work.