I would like to check if a column has a NOT NULL constraint in order to start an automated upgrade of the table definition.
However in H2 the SQL SELECT NULLABLE FROM TABLE_NAME
doesn't return me the NOT NULL columns and I don't seem to find anything similar to check the constraint on the table columns.
Notice I don't want to check the NOT NULL column values with something like SELECT COLUMN FROM TABLE WHERE COLUMN IS NOT NULL
! I want to check the table definition for that specific column.
thank you
Best Answer
If you have a definition like this:
The following query will show "NO" in the
is_nullable
column:If the column has a check constraint, like this:
then this will be shown as "nullable" with the first query. You would need to check
information_schema.constraints
and analyze the content of theCHECK_EXPRESSION
column to detect this.