MySQL error 1002 (ER_NO) is an internal placeholder message that surfaces when the server encounters an unexpected condition while building other error outputs.
MySQL Error 1002: ER_NO returns the bare message “NO” when the server hits an unexpected internal state, such as corrupt metadata or a reserved-word conflict. Rebuild metadata, restart the server, and upgrade to a patched MySQL release to resolve the issue.
NO
Error 1002 shows the literal message “NO” because the internal symbol ER_NO was left unresolved during error generation.
Although designed for server use only, it can surface to clients when the server logic fails earlier than expected.
The error belongs to SQLSTATE HY000 (general error) and usually signals corruption, obsolete server binaries, or misuse of keywords that confuse the parser.
DBAs most often meet ER_NO while starting the server, running DDL on damaged tables, or executing queries that reference objects with broken .frm definitions.
Legacy MySQL versions (≤5.6) and forks with custom plugins are more prone to exposing the internal placeholder.
Because the server returns only “NO,” client libraries cannot map the failure precisely.
Applications may treat it as a generic failure, leading to ambiguous error handling and possible data loss if writes are retried blindly.
Galaxy’s editor captures full server logs during query execution. When ER_NO appears, Galaxy highlights the failing statement, suggests reserved-word escapes, and lets engineers rerun the query against a staging replica, reducing downtime.
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MySQL 8.0 normally maps all errors correctly, so ER_NO should not appear. If it does, check for custom plugins or corrupted files.
No. The placeholder indicates an internal inconsistency. Investigate immediately to avoid silent data issues.
A restart can mask symptoms but won’t fix underlying corruption or buggy code. Use CHECK TABLE and upgrade paths.
Galaxy streams server logs and attaches them to each query run, making even vague placeholders like ER_NO actionable for developers.
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