I need to run a report grouped by week. This could be done by using group by week(date) but the client wants to set the day of the week that marks the end of week. So it can be Tuesday, Wednesday etc. How can I work this into a group by query?
The datetime column type is unix timestamp.
The WEEK() function takes an optional second parameter to specify the start of the week:
This function returns the week number for date. The two-argument form of WEEK() enables you to specify whether the week starts on Sunday or Monday and whether the return value should be in the range from 0 to 53 or from 1 to 53.
However, it can only be set to Sunday or Monday.
UPDATE: Further to the comments below, you may want to consider adding a new column to your table to act as a grouping field, based on WEEK(DATE_ADD(date INTERVAL x DAY)), as suggested in the comments. You may want to create triggers to automatically generate this values whenever the date field is updated, and when new rows are inserted. You would then be able to create a usable index on this new field as required.
Related
How to pass dynamic date parameters in tableau for which one parameter is 2022-01-01 and second parameter changes every quarter last day
Firstly, you should create a Calculation Field that represents END QUARTER. There're different ways, for example:
where DATETRUNC() - the beginning of the current quarter (01/07/2022),
DATEADD('quarter', 1) - obviously add 1 quarter (01/07/2022)
And -1 day to find the of the current quarter.
And when you create a Parameter, you should refer to this Calculated Field:
Every week, I get a new dataset that I need to insert in BigQuery. The data can arrive on any day of the week. Once the data is ingested, I want to query data that arrived last week.
One option is to use date as partitioning when the data arrived but then the developers would need to know the exact date when data arrived to query the partition.
Instead of this, while ingestion, I want to create an INTEGER column which represents the calendar week of the year. The format will be 202005 or 202153 where former represents fifth week of 2020 and latter represents second last week of year 2021.
Since this is an integer, the only option for partition seems to be range partitioning. For it, BigQuery is asking for a start, end and interval. What values should I define?
I can define the following but as you can imagine that this sounds wrong
start 202001
end 203054
inerval 1
Update:
It seems that bigquery will only create partitions for which it has data. I checked that by executing
#legacySQL
SELECT
project_id, dataset_id, table_id, partition_id, TIMESTAMP(creation_time/1000) AS creation_time
FROM [PROJECT_ID:DATASET_ID.TABLE_ID$__PARTITIONS_SUMMARY__]
Another option would be to still Partition by date - but not ingestion date or whatever date you have in mind, rather start date of respective week with the help of DATE_TRUNC function
DATE_TRUNC(your_date, WEEK)
Note: You even can define start day of the week
WEEK(): Truncates date_expression to the preceding week boundary, where weeks begin on WEEKDAY. Valid values for WEEKDAY are SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, and SATURDAY.
I have an SQL query I need to run once a month.
The data set the query produces always has to be from the 11th of the month before to the 10th of the current month.
I now manualy run the query in the fews days after the 11th day of the month manually adjusting the date range in my where statement:
for example...
Where Column A is greater than 10/10/2015 and less than 12/11/15
I was hoping there would be a statement I could add to my query to automatically find the 11th day of the last month and the 10th of the current month. This way I could schedule the query and automatically email the results.
You should be able to use the following within your query: -
CONVERT(date,FORMAT(GETDATE(),'yyyy-MM')+'-10')
(for the 10th of this month)
and
CONVERT(date,FORMAT(DATEADD(m,-1,GETDATE()),'yyyy-MM')+'-11')
(for the 11th of last month).
Try to look out the MONTH() function in your working DBMS. In MySQL and MSSQL it returns a number (1 been january) corresponding to the current month that your system is (you may check if it's date is updated).
With this function you can subtract 1 to get the last month, having to do some logic when the current one is January, hence 1. Since now you should get 12 (december) intead of 0 (an error).
Cheers, mate!
I know this one is pretty easy but I've always had a nightmare when it comes to comparing dates in SQL please can someone help me out with this, thanks.
I need to get the month and year of now then compare it to a date stored in a DB.
Time Format in the DB:
2015-08-17 11:10:14.000
I need to compare the month and year with now and if its > 12 months old I will increment a count. I just need the number of rows where this argument is true.
I assume you have a datetime field.
You can use the DATEDIFF function, which takes the kind of "crossed boundaries", the start date and the end date.
Your boundary is the month because you are only interested in year and month, not days, so you can use the month macro.
Your start time is the value stored in the table's row.
Your end time is now. You can get system time selecting SYSDATETIME function.
So, assuming your table is called mtable and the datetime object is stored in its date field, you simply have to query:
SELECT COUNT(*) FROM mtable where DATEDIFF(month, mtable.date, (SELECT SYSDATETIME())) > 12
I'm making a form where the user inputs their information and chooses a reservation date. So, the user picks a reservation date, and based on that date, I want to generate an end date that is 4 days after the start date.
I also want to make it so that if their reservation starts on a Monday it ends on a Thursday or if it starts on a Thursday it ends on a Monday.
How can I get the end date?
You will have to create your own PL/SQL stored procedure which will take in parameters the start date and the number of days to add.
Then your procedure will add the number of days and you will have a temp endDate.
Then, you will only have to check the day of the temp endDate, and if it is a weekend day, return the next Monday.
Apex allows you to have a dynamic action which can call a stored procedure and then update an item of your page.
Hope this helps.