Update static-properties.md (#2340)

update docs for `idColumn` to let others know how to disable default primary key assumption
Vincit · Jul 6, 2023 · 63f807a · 63f807a
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diff --git a/doc/api/model/static-properties.md b/doc/api/model/static-properties.md
@@ -118,6 +118,8 @@ Composite id can be specified by giving an array of column names.
 
 Defaults to 'id'.
 
+You can return `null` in order to tell objection there is no primary key. This may be useful in models of join tables.
+
 ## `static` jsonSchema
 
 ```js