SQLSTATE 42601 ERROR

syntax_error subquery has too many columns — 42601

PostgreSQL error 42601 — subquery has too many columns. A statement was rejected because of how it was written or what value it carried — not because of mis

PG 14 · 15 · 16 · 17 · 18 Reviewed Jul 2026

Incident Brief

What happened: A statement was rejected because of how it was written or what value it carried — not because of missing objects or permissions:

ERROR: subquery has too many columns

Immediate action: 1. Read the message — it states precisely what PostgreSQL objected to.
2. Return exactly the columns the comparison needs (usually one column for x IN (SELECT …)); use a ROW(…) on the left side

The fix

Copy-paste · works on PG 14–18
  1. Read the message — it states precisely what PostgreSQL objected to.
  2. Return exactly the columns the comparison needs (usually one column for x IN (SELECT ...)); use a ROW(...) on the left side on
Keep going

Related & next steps

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