我知道这是旧的，但它可以帮助其他人面临同样的问题.我从 mysql 迁移到 postgres 并遇到了同样的问题，因为我的表名以大写(Home")开头，我试图添加一个带有表名home"的约束.以小写开头.

I know this is old but it could help somebody else facing same issue. I migrated from mysql to postgres and got same issue because the name of my table started with upper case ("Home") and I was trying to add a constraint with table name "home" which starts with lowercase.