So, if I do an insert everyday, how do I get the latest rows of data that correspond to the latest date from Postgresql using SQlAlchemy?
Do this with two queries. First get the latest date. Then get the rows with that date. Here's an example where the Item model has an updated date column.
latest = session.query(func.max(Item.updated)).scalar()
items = session.query(Item).filter_by(updated=latest).all()
Related
I am written a query which pulls work schedule data on person level in Oracle Fusion HCM. What is the filter or the join condition which I need to add to pull the latest date column.
I have used the tables
PER_SCHEDULE_ASSIGNMENTS PSA
, ZMM_SR_SCHEDULES_TL ZSST
, PER_ALL_ASSIGNMENTS_M PAAM
, PER_ALL_PEOPLE_F PAPF
The query returns 4 rows with different dates. How to return only 1 row which has the latest date column in it?
Use SYSDATE BETWEEN EFFECTIVE_START_DATE AND EFFECTIVE_END_DATE in all the tables where the date start date is there.
This will get you the current row as of today from those tables. You won't have any duplicates anymore.
Every month I download a set of data into a report. That data consists of multiple records and each record has a record specific date as well as having the month end report date on the record's data-row.
I have used Power Query to upload all of these month end reports. I want use Power Query to be able to compare the column of record dates with the earliest date in the column of report dates to see if anybody has fiddled any data entry. The query table has the following headings.
Record ID Record Date Report Date
I've tried adding a custom column using the formula = if Record Date < List.Min(Report Date) then "Old" else "New"
this didn't work and I've spent ages trying to get a solution. I've also tried using Groups to get the minimum value, but I lose all of the other columns, which I want to keep. Any help really appreciated.
You have to refer to the fields in [], so here [Report Date]
To pick a column use Source[Field], so here #"PriorStep"[Report Date]
The List.Min function is not pulling as a number so you cant use <
Insert a Number.From in front of the calculation to convert to number
Same need to add Number.From in front of [Record Date] pulling as a date
Combined code:
#"Added Custom" = Table.AddColumn(#"PriorStep", "Custom", each if Number.From([Record Date])<Number.From(List.Min(#"PriorStep"[Report Date])) then "Old" else "New")
I am trying to find the data in a table which has a date as a column. I need to find out the rows corresponding to the certain date range. How can I do this?
This solved my problem:
SELECT * FROM <database_table> WHERE <date_field> BETWEEN "<start date>" AND "<end date>";
I need to fetch last 2 months data in DB2 environment ,What is the query? The dates are changing ,so ,it must be dynamic.
If you want to get latest dates which are dynamically inserted then do something like below
select * from ur_table where urdate between (select max(urdate)- 2 months from urtable) and (select max(urdate) from urtable)
I have the need to compare a date column with the max(date column) while making a filter selection.
E.g., when I compare [Date] = {max([Date])}, it finds the max/latest date in the entire data and compares. This gives me correct result when the latest month is included in the filter, but fails if I keep all months except the latest.
Is there a way in which the latest date can be searched in the subset of the data (based on filter selection)?
I am working with Redshift database (live connection).
look at the attached. https://www.dropbox.com/s/5zdkw9n003rxgvl/170524%20stack%20question.twbx?dl=0
{fixed : max(date)} will reflect only what is in the context filter.