I need to query all columns in a table of all customers, the main factor being the latest version for each customer.
My table:
My Query:
SELECT DISTINCT ON(code)
code,
namefile,
versioncol,
status
FROM table_A
ORDER BY versioncol desc
Error:
ERROR: SELECT DISTINCT ON expressions must match initial ORDER BY expressions LINE 1: SELECT DISTINCT ON(code)
Postgres' error message is trying to tell you what to do:
DISTINCT ON
expressions must match initialORDER BY
expressions
Actually that's quite clear: to make your code a valid DISTINCT ON
query, you just need to add code
(that's the DISTINCT ON
expression ) as a first sorting criteria to the query (ie as initial ORDER BY
).
SELECT DISTINCT ON(code) a.*
FROM table_A a
ORDER BY code, versioncol DESC
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