semiMonthEnd
Syntax
semiMonthEnd(X, [dayOfMonth=15], [offset], [n=1])
Arguments
X is a scalar/vector of data type DATE, DATEHOUR, DATETIME, TIMESTAMP or NANOTIMESTAMP.
dayOfMonth is an integer between 2 and 27. The default value is 15.
offset is a scalar of the same data type as X. It must be no greater than the minimum value of X. The default value is the minimum value of X.
n is a positive integer. The default value is 1.
Details
Suppose X is the d-th day of the month:
If d<dayOfMonth: return the last day of the previous month.
If d>=dayOfMonth: return the dayOfMonth-th day of the current month.
If parameter offset is specified, the result is updated every n semi-months. Parameter offset works only if parameter n>1.
Examples
$ semiMonthEnd(2012.06.12);
2012.05.31
$ semiMonthEnd(2012.06.24);
2012.06.15
$ semiMonthEnd(2012.06.15);
2012.06.15
$ semiMonthEnd(2012.06.16, 16);
2012.06.16
$ date=2016.04.07+(1..10)*7
$ time = take(09:30:00, 10);
$ sym = take(`MSFT,10)
$ price= 49.6 29.46 29.52 30.02 174.97 175.23 50.76 50.32 51.29 52.38
$ qty = 2200 1900 2100 3200 6800 5400 1300 2500 8800 4500
$ t1 = table(date, time, sym, qty, price);
$ t1;
date |
time |
sym |
qty |
price |
|---|---|---|---|---|
2016.04.14 |
09:30:00 |
MSFT |
2200 |
49.6 |
2016.04.21 |
09:30:00 |
MSFT |
1900 |
29.46 |
2016.04.28 |
09:30:00 |
MSFT |
2100 |
29.52 |
2016.05.05 |
09:30:00 |
MSFT |
3200 |
30.02 |
2016.05.12 |
09:30:00 |
MSFT |
6800 |
174.97 |
2016.05.19 |
09:30:00 |
MSFT |
5400 |
175.23 |
2016.05.26 |
09:30:00 |
MSFT |
1300 |
50.76 |
2016.06.02 |
09:30:00 |
MSFT |
2500 |
50.32 |
2016.06.09 |
09:30:00 |
MSFT |
8800 |
51.29 |
2016.06.16 |
09:30:00 |
MSFT |
4500 |
52.38 |
select avg(price),sum(qty) from t1 group by semiMonthEnd(date);
semiMonthEnd_date |
avg_price |
sum_qty |
|---|---|---|
2016.03.31 |
49.6 |
2200 |
2016.04.15 |
29.49 |
4000 |
2016.04.30 |
102.495 |
10000 |
2016.05.15 |
112.995 |
6700 |
2016.05.31 |
50.805 |
11300 |
2016.06.15 |
52.38 |
4500 |