EC
1735
MySQLERRORNotablePartitioningHIGH confidence

Unknown partition name specified

Production Risk

Low — query fails; no data affected.

What this means

A partition name referenced in a DDL or DML statement does not exist on the target table.

Why it happens
  1. 1Typo in the partition name.
  2. 2The partition was dropped or was never created.
  3. 3Referencing a partition by the wrong case (partition names are case-sensitive on some platforms).
How to reproduce
trigger — this will error
trigger — this will error
SELECT * FROM orders PARTITION (p_2099);

expected output

ERROR 1735 (HY000): Unknown partition 'p_2099' in table 'orders'.

Fix

List existing partitions and correct the name

List existing partitions and correct the name
SELECT PARTITION_NAME FROM information_schema.PARTITIONS
WHERE TABLE_SCHEMA = 'mydb' AND TABLE_NAME = 'orders';

Why this works

Querying information_schema.PARTITIONS shows exactly which partition names exist.

What not to do

✕

Sources
Official documentation ↗

MySQL 8.0 — 1735 ER_UNKNOWN_PARTITION

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