完整性约束违反报错排查：SQL_GWMDLLKDECSEPYVDIKOHHICMM.SYS_C007123893

Let’s work through this together—even straightforward scenarios can hide sneaky issues with integrity constraints, so let’s start by unpacking that system-generated constraint name first.

First: Figure Out What Kind of Constraint You’re Dealing With #

That SYS_C00XXXXXX name tells us this is an Oracle auto-created constraint, most likely a primary key, unique key, or foreign key. To get the full details, run this query (keep the owner name as-is unless you know it’s different):

SELECT 
  c.constraint_type, 
  c.table_name, 
  cc.column_name
FROM all_constraints c
JOIN all_cons_columns cc 
  ON c.constraint_name = cc.constraint_name
WHERE 
  c.constraint_name = 'SYS_C007123893' 
  AND c.owner = 'SQL_GWMDLLKDECSEPYVDIKOHHICMM';

This will show you exactly which table/column the constraint applies to, and whether it’s a primary key (P), unique key (U), or foreign key (R).

Next: Troubleshoot Based on Constraint Type #

If it’s a Primary Key or Unique Key Constraint

Violations here happen when your insert/update tries to add a duplicate value to the constrained column (or columns, if it’s a composite key). Even though you can see 10+25 records in your query, check these angles:

• Hidden duplicates or whitespace: Are there values that look unique but aren’t? Think trailing spaces, case differences (if your column uses case-sensitive collation), or invisible characters like newlines. Use DUMP() to inspect values closely:

  SELECT column_name, DUMP(column_name) FROM your_table;
  

• Operation-specific duplicates: Double-check the values you’re trying to insert/update. Do they match any existing row in the constrained column? Run a quick verification:

  SELECT * FROM your_table WHERE constrained_column = 'value_youre_using';
  

• Null edge cases: Primary keys can’t have nulls at all. Unique keys typically allow multiple nulls in Oracle, but it’s worth confirming you aren’t hitting an edge case here.

If it’s a Foreign Key Constraint

This means your operation is referencing a value that doesn’t exist in the parent table’s primary/unique key column. For example:

• If inserting a child record: Verify the foreign key value exists in the parent table:

  SELECT * FROM parent_table WHERE parent_key_column = 'foreign_key_value';
  

• If deleting a parent record: Make sure no child records are still referencing it (your constraint is likely set to ON DELETE RESTRICT if this is triggering an error).

Other Quick Checks #

• Triggers: Could a database trigger be modifying the constrained column behind the scenes? For example, a trigger that auto-sets a value that ends up violating the constraint. Check for triggers on your table:

  SELECT trigger_name, trigger_type FROM all_triggers 
  WHERE table_name = 'your_table' AND owner = 'SQL_GWMDLLKDECSEPYVDIKOHHICMM';
  

• Table mix-up: Are you performing the operation on the exact same table you’re querying? It’s easy to accidentally target a different schema’s table with the same name.

Start with identifying the constraint type—once you know that, the root cause usually becomes much easier to pin down.

内容的提问来源于stack exchange，提问作者Sergey V.