EC
1117
MySQLERRORCommonDDLHIGH confidence

Too many columns

Production Risk

Low — DDL fails; no data loss.

What this means

ER_TOO_MANY_FIELDS (1117, SQLSTATE HY000) is raised when a CREATE TABLE statement defines more than 4096 columns, which is MySQL's maximum per table.

Why it happens
  1. 1Auto-generated schema with an excessively large number of columns
  2. 2Misuse of columns to store what should be rows (EAV anti-pattern)
How to reproduce
trigger — this will error
trigger — this will error
-- CREATE TABLE with 4097+ column definitions

expected output

ERROR 1117 (HY000): Too many columns

Fix

Redesign the schema using normalized rows instead of columns

WHEN Schema has hundreds or thousands of columns.

Redesign the schema using normalized rows instead of columns
-- Instead of: t(attr1, attr2, ..., attr4097)
-- Use EAV or JSON:
CREATE TABLE attributes (
  entity_id INT,
  attr_name VARCHAR(100),
  attr_value TEXT,
  PRIMARY KEY (entity_id, attr_name)
);

Why this works

Storing attributes as rows rather than columns is more scalable and avoids the column limit entirely.

What not to do

✕ Split a 4097-column table into two tables to bypass the limit

Splitting a wide table into two linked tables may work technically but indicates the schema design needs fundamental reconsideration.

Sources
Official documentation ↗

MySQL 8.0 — 1117 ER_TOO_MANY_FIELDS

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