i'm stuck with this part of the query, where I need to get only just month and year from my table.
To put in context, i have tried with "TRUNC_DATE", and Oracle give me back an error like ORA-00904: "DATE_TRUNC": invalid identifier sql This piece of query get it from Udacity, but in sql Developer looks like it doesn't work.
When I try search deeper, I find something like convert(char(7), ia.invoice_date(), 120) yearMonth, It still not working and an error came back. ORA-00936: missing expression
I tried a lot of ways but no solutions.
If anyones have an idea o something that could help, I will be grateful.
Here below I paste the fragment of the query for guide help:
SELECT
COUNT(ia.invoice_id) total_de_facturas,
SUM(ia.invoice_amount) monto_total,
convert(char(7), ia.invoice_date(), 120) yearMonth
FROM AP.ap_invoices_all ia GROUP BY ia.vendor_id;
You ae mixing Oracle syntax with Postgres ( date_trunc()
) and SQL Server ( convert()
). Many date functions are vendor-specific, so you learn the relevant syntax for your database.
In Oracle, you would use trunc()
to truncate a date to the first day of the month:
trunc(ia.invoice_date, 'mm')
Use the EXTRACT function, try these out to test how it works and use it in your query -
SELECT EXTRACT(YEAR FROM DATE '2020-03-07') FROM DUAL;
SELECT EXTRACT(MONTH FROM DATE '2020-03-07') FROM DUAL;
If you want a string value in YYYY-MM format - which seems to be your intention from the 120 style and the char(7)
in the SQL Server-syntax convert()
call - then you can just use to_char()
with that format model:
to_char(ia.invoice_date, 'YYYY-MM') as yearMonth
You don't need to truncate to the first of the month as you're discarding the day part anyway.
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