<p>MySQL raises ER_NO_SUCH_KEY_VALUE (code 1741) when a referenced key value is missing in the parent table during an operation that requires it.</p>
<p>MySQL Error 1741 ER_NO_SUCH_KEY_VALUE occurs when a query references a key value that does not exist in the parent table. Verify the key and insert or correct the missing value to resolve the issue.</p>
Key value '%s' was not found in table '%s.%s'
MySQL throws error 1741 with the message "Key value '%s' was not found in table '%s.%s'" when a statement references a primary or unique key value that is not present in the target table.
The error is common in MySQL Cluster (NDB) but can appear in any setup that enforces referential constraints at the storage-engine level.
The error surfaces during INSERT, UPDATE, DELETE, or foreign key cascade operations that need to locate a specific row by key.
Bulk loads, replication, and application code that bypasses sanity checks frequently trigger the condition.
Unresolved, the error blocks data modifications, leads to partial transactions, and may cause application downtime.
Quick remediation ensures data consistency, keeps ETL jobs running, and maintains referential integrity.
Missing parent rows, incorrect key values, or deleted records usually cause the error.
Schema mismatches, replication lag, and application logic errors also contribute.
Identify the missing key, insert or correct it, and rerun the query.
Use transactions to ensure atomicity and prevent partial failures.
During batch imports, preload parent keys before child rows.
When deleting parent data, use ON DELETE CASCADE or remove dependents first.
Enable strict foreign key checks and use transactions for multi-table writes.
Automate data validation in CI pipelines via Galaxy's AI copilot to catch issues early.
Errors 1452 (ER_NO_REFERENCED_ROW_2) and 1451 (ER_ROW_IS_REFERENCED_2) also indicate referential issues but differ in context: 1452 occurs on insert/update, 1451 on delete.
The referenced primary or unique key was never inserted, often due to out-of-order ETL loads.
A parent row was deleted without cascading, leaving orphaned child references.
On replicas, the child statement arrived before the parent row because of delayed replication.
Mismatched column definitions cause lookups to fail even when values appear identical.
Raised when inserting or updating a child row that lacks a parent key, similar but occurs outside NDB context.
Appears when deleting a parent row that still has child references.
Triggered when a requested record cannot be found by key during replication or storage engine operations.
Temporarily yes, but it risks data corruption. Fix the underlying key instead.
It is most common in NDB Cluster but can appear in any engine doing strict key lookups.
Yes. Galaxy's AI copilot validates foreign key relations in saved queries and CI pipelines.
The error appears in MySQL 5.7+ and MariaDB variants that implement the same error code.
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