SQLite: Summary data of a query result - sqlite

Question

I have the following query that provides me with the 10 most recent records in the database:
SELECT
dpDate AS Date,
dpOpen AS Open,
dpHigh AS High,
dpLow AS Low,
dpClose AS Close
FROM DailyPrices
WHERE dpTicker = 'DL.AS'
ORDER BY dpDate DESC
LIMIT 10;
The result of this query is as follows:
bash-3.2$ sqlite3 myData < Queries/dailyprice.sql
Date Open High Low Close
---------- ---------- ---------- ---------- ----------
2016-06-13 4.0 4.009 3.885 3.933
2016-06-10 4.23 4.236 4.05 4.08
2016-06-09 4.375 4.43 4.221 4.231
2016-06-08 4.406 4.474 4.322 4.35
2016-06-07 4.377 4.466 4.369 4.384
2016-06-06 4.327 4.437 4.321 4.353
2016-06-03 4.34 4.428 4.316 4.335
2016-06-02 4.434 4.51 4.403 4.446
2016-06-01 4.51 4.512 4.317 4.399
2016-05-31 4.613 4.67 4.502 4.526
bash-3.2$
Whilst I need to plot the extracted data, I also need to obtain the following summary data of the dataset:
Minimum date ==> 2016-05-31
Maximum date ==> 2016-06-13
Open value at minimum date ==> 4.613
Close value at maximum date ==> 3.933
Maximum of High column ==> 4.67
Minimum of Low column ==> 3.885
How can I, as newbie, approach this issue? Can this be done in one query?
Thanks for pointing me in the right direction.
Best regards,
GAM

Answer 1

The desired output can be achieved with
aggregate functions on a convenient common table expression,
which uses OPs expression verbatim
OPs method, with limit 1 applied to common table expression,
for getting mindate and maxdate among the ten days
Query:
WITH Ten(Date,Open,High,Low,Close) AS
(SELECT dpDate AS Date,
dpOpen AS Open,
dpHigh AS High,
dpLow AS Low,
dpClose AS Close
FROM DailyPrices
WHERE dpTicker = 'DL.AS'
ORDER BY dpDate DESC LIMIT 10)
SELECT min(Date) AS mindate,
max(Date) AS maxdate,
(SELECT Open FROM Ten ORDER BY Date ASC LIMIT 1) AS Open,
max(High) AS High,
min(Low) AS Low,
(SELECT Close FROM Ten ORDER BY Date DESC LIMIT 1) AS Close
FROM Ten;
Output (.headers on and .mode column):
mindate maxdate Open High Low Close
---------- ---------- ---------- ---------- ---------- ----------
2016-05-31 2016-06-13 4.613 4.67 3.885 3.933
Note:
I think the order of values in OPs last comment do not match the order of columns in the preceding comment by OP.
I chose the order from the preceding comment.
The order in the last comment seems to me to be "mindate, maxdate, Open, Close, High, Low".
Adapting my proposed query to that order would be simple.
Using SQLite 3.18.0 2017-03-28 18:48:43
Here is the .dump of my toy database, i.e. my MCVE, in case something is unclear. (I did not enter the many decimal places, it is probably a float rounding thing.)
PRAGMA foreign_keys=OFF;
BEGIN TRANSACTION;
CREATE TABLE dailyPrices (dpDate date, dpOpen float, dpHigh float, dpLow float, dpClose float, dpTicker varchar(10));
INSERT INTO dailyPrices(dpDate,dpOpen,dpHigh,dpLow,dpClose,dpTicker) VALUES('2016-06-13',4.0,4.009000000000000341,3.8849999999999997868,3.9329999999999998294,'DL.AS');
INSERT INTO dailyPrices(dpDate,dpOpen,dpHigh,dpLow,dpClose,dpTicker) VALUES('2016-06-10',4.2300000000000004263,4.2359999999999997655,4.0499999999999998223,4.080000000000000071,'DL.AS');
INSERT INTO dailyPrices(dpDate,dpOpen,dpHigh,dpLow,dpClose,dpTicker) VALUES('2016-06-09',4.375,4.4299999999999997157,4.2210000000000000852,4.2309999999999998721,'DL.AS');
INSERT INTO dailyPrices(dpDate,dpOpen,dpHigh,dpLow,dpClose,dpTicker) VALUES('2016-06-08',4.4059999999999996944,4.4740000000000001989,4.3220000000000000639,4.3499999999999996447,'DL.AS');
INSERT INTO dailyPrices(dpDate,dpOpen,dpHigh,dpLow,dpClose,dpTicker) VALUES('2016-06-07',4.3769999999999997797,4.4660000000000001918,4.3689999999999997726,4.384000000000000341,'DL.AS');
INSERT INTO dailyPrices(dpDate,dpOpen,dpHigh,dpLow,dpClose,dpTicker) VALUES('2016-06-06',4.3269999999999999573,4.4370000000000002771,4.3209999999999997299,4.3529999999999997584,'DL.AS');
INSERT INTO dailyPrices(dpDate,dpOpen,dpHigh,dpLow,dpClose,dpTicker) VALUES('2016-06-03',4.3399999999999998578,4.4370000000000002771,4.3209999999999997299,4.3529999999999997584,'DL.AS');
INSERT INTO dailyPrices(dpDate,dpOpen,dpHigh,dpLow,dpClose,dpTicker) VALUES('2016-06-02',4.4340000000000001634,4.5099999999999997868,4.4029999999999995807,4.4459999999999997299,'DL.AS');
INSERT INTO dailyPrices(dpDate,dpOpen,dpHigh,dpLow,dpClose,dpTicker) VALUES('2016-06-01',4.5099999999999997868,4.5119999999999995665,4.3170000000000001705,4.3990000000000000213,'DL.AS');
INSERT INTO dailyPrices(dpDate,dpOpen,dpHigh,dpLow,dpClose,dpTicker) VALUES('2016-05-31',4.6130000000000004334,4.6699999999999999289,4.5019999999999997797,4.525999999999999801,'DL.AS');
COMMIT;