Informix Error -203

Reasons / Common Causes

-203 is a specific, well-defined numeric-literal validation failure: an integer was expected, and what appeared instead was a value that isn't a valid plain integer — a decimal point, an exponential-notation e, or a magnitude larger than a 32-bit signed integer can hold (2,147,483,647).

1. A decimal point in a value where an integer is expected — 3.5 where 3 was intended, or a floating-point default accidentally used where an INTEGER column or parameter expects a whole number.
2. Scientific/exponential notation (the letter e, as in 1e10) used where a plain integer literal is expected.
3. A value exceeding the 32-bit signed integer range — a large ID, a timestamp represented as an integer, or a count that has grown beyond what fits in a standard INTEGER, needing BIGINT/INT8 instead.
4. Application code passing a floating-point variable — from a language with automatic numeric type inference — into a context Informix expects as a plain integer, without proper casting or formatting.
5. Auto-incrementing IDs or sequence-derived values that have grown large enough to exceed the 32-bit integer limit, especially in older schemas that used INTEGER instead of BIGSERIAL/INT8 for primary keys.
6. Copy-pasted or generated SQL literals with unintended decimal points — a common artifact of spreadsheet exports that format whole numbers with a trailing .0.

Solutions / Resolution

1. Inspect the statement for numbers that should be integers but contain a decimal point or e, per the official guidance, and correct them to plain integer literals.
2. If a legitimate value exceeds 2,147,483,647, use BIGINT/INT8 for the column and literal instead of INTEGER — the underlying data genuinely doesn't fit in a 32-bit integer, and the fix is a type change, not reformatting the value.
3. Review application code for implicit floating-point formatting of values intended to be integers — a language or ORM that always formats numbers with a decimal point needs explicit casting before the value reaches the SQL statement.
4. For auto-generated SQL or data exports, check whether the source (a spreadsheet, an ETL tool) is introducing unwanted decimal formatting on whole numbers.
5. Plan a proactive migration to BIGSERIAL/INT8 if a serial primary key or similar auto-incrementing value is approaching the 32-bit limit, rather than waiting for -203 to force a reactive fix.

Examples

A decimal point where an integer is expected

INSERT INTO orders (order_id, quantity) VALUES (1001, 5.0);
-- -203: quantity expects a plain integer, not 5.0

Fix:

INSERT INTO orders (order_id, quantity) VALUES (1001, 5);

A value exceeding the 32-bit integer range

INSERT INTO events (event_id) VALUES (3000000000);
-- -203: exceeds 2,147,483,647 — event_id needs BIGINT/INT8, not INTEGER

Language-level floating-point formatting

quantity = 5  # an integer in the application
sql = f"INSERT INTO orders VALUES ({quantity})"

If the application language or a serialization layer formats quantity as 5.0 rather than 5 under some code path, the generated SQL fails with -203 even though the original value was conceptually a whole number.

Diagnostic Checks

1. Review the statement for any numeric literal with a decimal point or e appearing in an integer context.
2. Check whether a specific value's magnitude exceeds 2,147,483,647.
3. Review application code or ORM formatting of numeric values feeding into the statement, if the SQL is generated rather than hand-written.

Related Errors / Related Topics

• -201 — "A syntax error has occurred." The general SQL-parsing-error family this belongs to.
• -200 — "Identifier is too long." Another general SQL parser-level error in the same immediate numeric neighborhood.

Check the specific number's format and magnitude directly — a decimal point, an e, or a value over 2,147,483,647 are the three things this error is always about.