How to Fix: ERROR: there is no unique constraint matching given keys for referenced table "bar"
Postgres error due to non-unique constraint on referenced table.
📋 Table of Contents
The error message you're encountering, 'ERROR: there is no unique constraint matching given keys for referenced table "bar"', indicates that the UNIQUE constraint on the foo_fk column in the bar table is being overridden by a PRIMARY KEY constraint.
⚠️ Common Causes
- The problem arises from the combination of PRIMARY KEY and UNIQUE constraints on the same column.
🔧 Proven Troubleshooting Steps
Method 1: Remove the PRIMARY KEY Constraint from foo_fk Column
- Step 1: Drop the primary key constraint on the foo_fk column in the bar table using the following SQL query: ALTER TABLE bar DROP CONSTRAINT foo_fk_pkey;
Method 2: Remove the PRIMARY KEY Constraint from bar Table
- Step 1: Drop the primary key constraint on the pkey column in the bar table using the following SQL query: ALTER TABLE bar DROP CONSTRAINT pkey;
🎯 Final Words
By removing one of these constraints, you should be able to create the table structure without any issues. Remember that when creating a foreign key constraint, it is essential to ensure that there are no duplicate values in the referenced column.
❓ Frequently Asked Questions
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