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docs(validations): primary keys are NOT NULL; HARDSELECT can match a special missing

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- a primary key column rejects a blank and a special missing whether or not
  the table carries a constraint or MPE_VALIDATIONS a NOTNULL rule
- HARDSELECT is now checked like any other value: it passes when the
  dropdown list contains the special missing
- HARDSELECT drops out of the 'not supported' list
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dc
2026-09-23 08:19:40 +00:00
parent 4d53ced89c
commit e7fdb3ab52
1 changed files with 4 additions and 2 deletions
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docs/dcc-validations.md
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@@ -60,10 +60,12 @@ The rules treat a special missing as a value for some checks and as a missing va
|ROUND|Ignored - ROUND only rounds values that are numbers, so a special missing is left as typed.|
|HARDREGEX / SOFTREGEX|Checked against the pattern like any other value. Unlike blanks and the plain `.`, special missings are **not** exempt. See [Regex Rules](#regex-rules).|
|SOFTSELECT|Passes - a soft dropdown never blocks a value.|
|HARDSELECT|Fails - the strict membership test cannot match it (the dropdown list for a numeric column holds numbers).|
|HARDSELECT|Checked against the dropdown list like any other value - it passes only if the list contains it.|
|HARDFORMULA / SOFTFORMULA|The formula returns `#VALUE!` for that row instead of a number, and that is what gets submitted.|
In short, a special missing is **not supported** in a column that carries NOTNULL, MINVAL, MAXVAL, HARDSELECT or a formula. It is fine alongside the regex rules, a soft dropdown, and ROUND.
In short, a special missing is **not supported** in a column that carries NOTNULL, MINVAL, MAXVAL or a formula. It is fine alongside the regex rules, a soft dropdown, and ROUND.
A primary key column is treated as NOT NULL whether or not the target table carries a physical constraint, and whether or not MPE_VALIDATIONS has a NOTNULL rule for it - a key identifies the row, so a blank and a special missing are both rejected there.
One related gotcha: a range rule's own value must be a number. Put a special missing in `MINVAL` and every cell in the column fails; put one in `MAXVAL` and every real number fails.