server/src/plugins/dbSchema/sql/constraints.sql
select
coalesce(table_schema, referenced_schema) as table_schema,
coalesce(table_name, referenced_table) as table_name,
coalesce(column_name, referenced_column) as column_name,
constraint_schema,
constraint_name,
constraint_type,
check_clause,
referenced_schema,
referenced_table,
referenced_column
from information_schema.table_constraints
natural full join information_schema.key_column_usage
natural full join information_schema.check_constraints
inner join (
select
table_schema as referenced_schema,
table_name as referenced_table,
column_name as referenced_column,
constraint_name
from information_schema.constraint_column_usage
) as referenced_columns using (constraint_name)
where constraint_schema = ?
order by table_schema, table_name, ordinal_position