I have a table where a user answers to a question. The rules are that the user can answer to many questions or many users can answer one question BUT a user can answer to a particular question only once. If the user answers to the question again, it should simply replace the old one. Generally the on conflict do
Tag: upsert
PostgreSQL Partial Indexes and UPSERT
After googling a lot my question is described below: Attempting to insert values: Results in: Altho this works(per spec): PostgreSQL documentation stands that it should work PostgreSQL v9.5 My aim is to find way to create unique index on this table on multiple nullable columns and update old rows with new ones on UPSERT Answer The conflict_target used in on
How do I UPDATE a row in a table or INSERT it if it doesn’t exist?
I have the following table of counters: I would like to increment one of the counters, or set it to zero if the corresponding row doesn’t exist yet. Is there a way to do this without concurrency issues in standard SQL? The operation is sometimes part of a transaction, sometimes separate. The SQL must run unmodified on SQLite, PostgreSQL and
Solutions for INSERT OR UPDATE on SQL Server
Assume a table structure of MyTable(KEY, datafield1, datafield2…). Often I want to either update an existing record, or insert a new record if it doesn’t exist. Essentially: IF (key exists) run …