How to create a view in PostgreSQL with where clause - sql

Question

I am trying to create a view in Postgres
I have 3-4 time stamps in each closing_date where I need to select only the latest time stamp of each day
And also I have to restrict the closing_date to only 30 days (shown in SQL query below)
Below is the query from SQL data which I had created
CREATE VIEW dbo.CashBreaks_30Days_View as
SELECT Closing_date,Bo,Desk,Breaks_Staus,Owner,status,Team,
SLA,Age_Bucket_EntryDate,Age_Bucket_ValueDate,Age_EntryDate,Age_ValueDate,
[Type_(2)]
FROM Master_Data_CashBreaks
WHERE Closing_date >= cast(getdate()-37 as date);

Answer 1

If I understood you correctly, something like this might return result you want:
create or replace view cash_breaks_30days_view
as
select a.list_of_columns
from master_data_cashbreaks a
where a.closing_date >= trunc(sysdate) - 30 --> the last 30 days
and a.closing_date = (select max(b.closing_date) --> subquery is used to return
from master_data_cashbreaks b -- the last timestamp per date
where b.id = a.id
and trunc(b.closing_date) = trunc(a.closing_date)
)

Answer 2

There are few mistakes in your code:
[Type_(2)] - Not a valid SQL
getdate() - There is no such function available in Oracle. you should use the trunc(SYSDATE) instead.
getdate()-37 - Why -37, when you want the last 30 days data. It should be 30.
Your query should look like this in oracle:
CREATE VIEW dbo.CashBreaks_30Days_View as
SELECT * FROM
(SELECT Closing_date,Bo,Desk,Breaks_Staus,Owner,status,Team,
SLA,Age_Bucket_EntryDate,Age_Bucket_ValueDate,Age_EntryDate,Age_ValueDate,
ROW_NUMBER() OVER (PARTITION BY Closing_date ORDER BY Closing_date DESC) AS RN
FROM Master_Data_CashBreaks
WHERE Closing_date >= TRUNC(SYSDATE) - 30)
WHERE RN = 1;

Answer 3

Your SQL contains a lot of errors
square brackets are invalid in SQL identifiers, if you have such a column you need to use double quotes. It's unclear to me if your column is named "[Type_(2)]" or maybe just `"Type_(2)"
There is no getdate() in SQL or in Postgres. Use current_date instead
So fixing all those error, your statement should look like this:
CREATE VIEW dbo.CashBreaks_30Days_View
as
SELECT Closing_date, Bo, Desk, Breaks_Staus, Owner, status,
Team, SLA, Age_Bucket_EntryDate,
Age_Bucket_ValueDate, Age_EntryDate, Age_ValueDate,
"[Type_(2)]" -- or maybe only "Type_(2)"
FROM Master_Data_CashBreaks
WHERE Closing_date >= current_cate - 30;

Answer 4

i am able to create with the below
create or replace view cashbreaks_30days_view_latesttime
as
select a. Column details
from master_data a
where a. Closing_date >= NOW() - interval '40 days'
and a.closing_date = (select max(b.closing_date)
from master_data b
where date(b.closing_date) = date(a.closing_date));