n postgres, how do I change an existing user to be a superuser? I don't want to delete the existing user, for various reasons.
# alter user myuser ...?
To change an existing user to be a superuser in PostgreSQL, you can use the `ALTER USER` command. Here's the syntax:
```sql
ALTER USER username WITH SUPERUSER;
```
Replace `username` with the name of the user you want to promote to superuser. Note that you need to have appropriate privileges to execute this command.
For example, to change a user named "myuser" to be a superuser, you can run:
```sql
ALTER USER myuser WITH SUPERUSER;
```
This command will elevate the privileges of the user to have superuser access, granting them full control over the PostgreSQL database server.
Please let me know if there's anything else I can help you with.