I am writing a function to pull the dates in the past 12 months. I am thinking to use (Current_date - 1month) for endubg month and (current_date -13months) for the beginning month.
However, when I use Current_date function, it returns me to the value 2022-12-29. Ideally, I would want the value to be 202212 in numeric forms because of my database. Beginning month should be 202112 and the ending month should be 202211. Is there a way I could do this in SQL?
We can use the TO_CHAR() function here:
SELECT TO_CHAR(CURRENT_DATE, 'YYYYMM');
Related
I would like to the current date minus a previous begin date with the result with the result being the number days there is a difference of the two?
I have attempted the following: date_sub(Begindt, INTERVAL current_date)
Also, will I have to cast things differently?
Below is for BigQuery Standard SQL
DATE_DIFF(CURRENT_DATE(), Begindt, DAY)
See more for DATE_DIFF()
Above assumes the Begindt field is of DATE type
If not, you should cast to DATE type via CAST or PARSE_DATE functions
Are you finding something like below
DATE_DIFF(Begindt, CURRENT_DATE, day)
I want to be able to do something like
SELECT cast(my_date_col AS int) FROM my_table;
I would like to get the integer which MonetDB uses internally, i.e. the value you'd find if you looked into the BAT structure and got the appropriate element in code in MonetDB's GDK. Now, AFAICT, this internal value is the number of days since the Epoch, being Jan 1st on "Year 0" (so January 3rdt year 2 would be 366+365+2 = 732).
The best I could actually manage is
SELECT my_date_col AS int - cast('1-1-1' AS date) - 366 FROM my_table;
As MonetDB won't accept "Year zero" dates. This is rather an ugly hack, I'd like to do better. Help me?
If you're trying to get the number of days between "my_date_col" and 1970-01-01, in standard SQL you'd just subtract the one from the other. Your platform, monetdb, seems to support this syntax, but I don't have it installed. I wrote these examples in PostgreSQL.
select current_date - date '1970-01-01' as num_days;
num_days
--
16213
Check that result by adding 16213 days to the current date (2014-05-23).
select cast ((date '1970-01-01' + interval '16213' day) as date) as target_date
target_date
--
2014-05-23
The cast is necessary, because the result of this addition is a timestamp, not a date.
In your case, you want a column name instead of "current_date". So you're looking for something along these lines.
select my_date_col - date '1970-01-01' as num_days
from your-table-name;
One of my column needs to be transformed into a date field. It contains a value that gives the YYMM and it should be translated into the last day of that month:
For example, 1312 should become 12/31/2013.
I have tried various last_day, to_char functions but not able to convert 1312 in a date format. Please help !!
Netezza is based on Postgres, so maybe the Postgres method will work. Here is Postgres code that works (see here):
select to_date('1312'||'01', 'YYMMDD') + interval '1 month' - interval '1 day'
I would first convert the number to a date, then add 1 month and subtract 1 day.
select add_months(to_date(1312, 'yymm'), 1) - 1 as the_date
I am trying to use the add_month function but getting an error. I want to get the number of visits between [CAL_DATE - 13 months] and [CAL_DATE]. The format of the dates are as following: 2007-14, 2010-05, 2009-04 and etc. this is the error I am getting
"Bad time stamp external representation '2009-11"
and here is the code I am using. I can't seem to figure out the issue.
CAL_DATE BETWEEN add_months(CAL_DATE,-13) AND CAL_DATE.
I am using netezza database.
Presumably add_months expects a date as its first argument and returns a date. You don't have dates, you have YYYY-MM strings so you have two problems:
add_months won't know what to do with a YYYY-MM string.
BETWEEN won't know what to do with a date and a YYYY-MM string.
If you want to use add_months then you'll have to give it a date and convert the date it gives you to one of your YYYY-MM strings with something like this:
to_char(add_months((cal_date || '-01')::date, -13), 'yyyy-mm')
Appending -01 to your strings should give you a string representation of the first of that month and you should be able to cast that to a date with ::date. Then a to_char to convert the result of add_months back to your YYYY-MM format.
Alternatively, since add_months isn't really doing anything useful for you here, just use a PostgreSQL interval for the month adjustment:
to_char((cal_date || '-01')::date - interval '13 months', 'yyyy-mm')
I need to find some records created in a range of quarters. For example, I'm looking for all records created between the 4th quarter of 2008 and the 1st quarter of 2010. I have this in my WHERE-clause:
...and r.record_create_date between to_date('2008 4','YYYY Q')
and to_date('2010 1','YYYY Q')
but Oracle says: ORA-01820: format code cannot appear in date input format. The Q is a valid date format symbol, so I'm not sure what's happened. Is this even a valid way to find values in between calender quarters, or is there a better way?
Also interesting, and possibly related, if I execute this:
select to_date('2009','YYYY') from dual;
The value displayed in my IDE is 2009-08-01. I would have expected 2009-08-04, since today is 2010-08-04.
This:
select to_date('2009 1','YYYY Q') from dual;
of course, fails.
(Oracle 10g)
Oracle says: ORA-01820: format code cannot appear in date input format. The Q is a valid date format symbol, so I'm not sure what's happened.
See the second column of table 2.15 at http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/sql_elements004.htm#i34948. Not all format elements are allowed when converting to dates, timestamps, etc.
I recommend against using between for date range checks. People often will miss values within the ending day that the expect to be included. So I would translate:
and r.record_create_date between to_date('2008 4','YYYY Q')
and to_date('2010 1','YYYY Q')
To
and to_date('2008-10-01', 'YYYY-MM-DD') <= r.record_create_date
and record_create_date < to_date('2010-04-01', 'YYYY-MM-DD') -- < beginning of 2Q2010.
Someone asked the same question on OTN: http://forums.oracle.com/forums/thread.jspa?threadID=1081398&tstart=255
The crux of the issue is that you can not specify "Q" in the TO_DATE function.
Given that you're already specifying a portion of the date, why not provide the entire date? Mind too that to_date('2010 1','YYYY Q') would give you Jan 1st, 2010 when you really want March 31st, 2010... at a second to midnight.
Since the relationship between quarters to months is one-to-many, it doesn't make sense to do TO_DATE('2008 1', 'yyyy q'); what date should be returned? The first of the quarter, the end of the quarter, ...? (On the other hand, converting a date to a quarter - like TO_CHAR(SYSDATE, 'yyyy q') makes sense because a specific date only exists in one quarter.)
So, if you do want a query that looks for a date that falls between two quarters, you will have to "rolll your own" (explicitly stating the dates of the start/end of a quarter.)
As a side note, in case anyone is considering not using TO_DATE please do not use things like: WHERE date_value BETWEEN 'date string1' and 'date string2' without the TO_DATE function. It assumes a default date format and under certain situations can avoid potentially useful indexes altogether.
Below is one example where the same query can have a different result.
select sysdate from dual where sysdate between '1-Jan-10' and '31-Dec-10';
SYSDATE
---------
04-AUG-10
SQL> alter session set nls_date_format = 'YYYY-MM-DD';
Session altered.
SQL> select * from dual where sysdate between '1-Jan-10' and '31-Dec-10';
no rows selected
(Notice that in the second instance no error is returned. It just assumes Jan 10, 0001 and Dec. 10th, 0031.)
I think the best way is to just input the quarter start date and quarter end dates without even bothering with to_date. I think if you use
between '1-Jan-10' and '31-Dec-10'
for example, then you don't (in Oracle I believe) need to_date and it isn't much more difficult than typing in the quarter number
To calculate in Oracle the first day of a quarter and the last day of a quarter from the year and quarter:
I Use the fact
start_month= -2 + 3 * quarter
last_month = 3 * quarter
variable v_year number
variable v_quarter number
exec :v_year :=2017
exec :v_quarter:=4
select :v_year as year,
:v_quarter as quarter,
to_date(:v_year||to_char(-2+3*:v_quarter,'fm00'),'yyyymm') as quarter_start,
last_day(to_date(:v_year||to_char(3*:v_quarter,'fm00')||'01 23:59:59','yyyymmdd hh24:mi:ss')) as quarter_end
from dual a;
YEAR|QUARTER|QUARTER_START |QUARTER_END
2017| 4|2017-10-01 00:00:00|2017-12-31 23:59:59