I just trying to upgrade Magento 2.3 and while upgrading getting this error.
Schema creation/updates:
SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry ‘3-’ for key ‘EAV_ATTRIBUTE_GROUP_ATTRIBUTE_SET_ID_ATTRIBUTE_GROUP_CODE’, query was: ALTER TABLE eav_attribute_group ADD CONSTRAINT EAV_ATTRIBUTE_GROUP_ATTRIBUTE_SET_ID_ATTRIBUTE_GROUP_CODE UNIQUE KEY (attribute_set_id,attribute_group_code)
rest are Ok, please suggest how to fix.
Thanks!