2200FERRORTier 3 — Handle with care✅ HIGH confidence

zero length character string

Category: Data ExceptionVersions: All Postgres versions

What this means

SQLSTATE 2200F is raised when a zero-length (empty) string is provided in a context that explicitly requires a non-empty string — for example, some character-type functions or specific domain constraints.

Why it happens

1Passing an empty string to a function or context that requires at least one character

How to reproduce

Empty string where non-empty is required.

trigger — this will ERROR

ERROR: zero-length delimited identifier

Fix 1: Validate that the string is non-empty before use

When accepting string values from user input or external sources.

fix

SELECT NULLIF(input_col, '') FROM data;

Why this works

NULLIF converts empty strings to NULL, which can then be handled via COALESCE or a default value.

Sources

📚 Official docs: https://www.postgresql.org/docs/current/errcodes-appendix.html

🔧 Source ref: Class 22 — Data Exception

Confidence assessment

✅ HIGH confidence

Standard SQLSTATE. Stable across versions.