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#Postgres unique constraint multiple columns how to
#Postgres unique constraint multiple columns update

CASCADE: Selecting the cascade option means that when we delete the customer record, the records that reference it in the orders table are also deleted.Only then will you be able to remove the value from the customer table. To delete a customer, you will first have to remove any associated records from the orders table. RESTRICT: Choosing to restrict deletions means that PostgreSQL will refuse to delete the customer record if it's referenced by a record in the orders table.We can choose between the following options: We need to specify how we want the system to respond when we delete a customer from the customers table when the customer has an associated order in the orders table. One consideration you'll need to think about when defining foreign key constraints is what to do when a referenced table is deleted or updated.Īs an example, let's look at the customers and orders tables again. Deciding what to do with foreign keys when deleting or updating Prisma is an open-source database toolkit for Typescript and Node.js that aims to make app developers more productive and confident when working with databases. The United States' most popular databases by state going into 2022.Traditional databases vs serverless databases.Introduction to common serverless challenges.Top 13 serverless computing and database providers.Introduction to database backup considerations.How microservices and monoliths impact the database.Syncing development databases between team members.Troubleshooting database outages and connection issues.What is connection pooling and how does it work?.Top 8 TypeScript ORMs, query builders, & database libraries: evaluating type safety.Top 11 Node.js ORMs, query builders & database libraries in 2022.Introduction to MongoDB Aggregation Framework.Introduction to MongoDB database tools & utilities.Working with dates and times in MongoDB.Introduction to MongoDB connection URIs.

#Postgres unique constraint multiple columns how to

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#Postgres unique constraint multiple columns update

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LINE 2: on conflict (kv_key_value) do update set extra=exclude. However I am still unable to specify the constraint name as the conflict target: insert into kv (key, value, extra) values ('k1', 'v1', 'e1')ĮRROR: column "kv_key_value" does not exist My second try was to put the unique constraint explicitly in the create table: create table kv (Ĭonstraint kv_key_value unique(key, value)) ĭescribing the above table, the output of "Indexes:" is slightly different ("UNIQUE CONSTRAINT" vs "UNIQUE" in previous example): "kv_key_value" UNIQUE CONSTRAINT, btree (key, value) On conflict (kv_key_value) do update set extra=excluded.extra ĭescribing the above table, I see the following under "Indexes:" "kv_key_value" UNIQUE, btree (key, value) On conflict (key, value) do update set extra=excluded.extra Insert into kv (key, value, extra) values ('k1', 'v1', 'e1') Insert into kv (key, value) values ('k1', 'v1') My first attempt was to just create a UNIQUE index, which works fine with the constraint inference: create table kv (key text, value text, extra text) Ĭreate unique index kv_key_value on kv(key, value) However, when attempting to reference the constraint name, I get a "column. The docs would seem to indicate that the conflict target of the INSERT statement can be either an index expression or a constraint name. I'm running into a behavior I don't understand when trying to do an UPSERT with PostgreSQL.