How can I find the parent table(s) of foreign constraint(s) on a table key in oracle? I'm needing to create a dropdown of all of the values that can be selected for this column I'm looking at and need to know the parent so I can look up its sibling values.
如何在oracle中找到表键上的外约束的父表?我需要为我正在查看的这一列创建所有可选择的值的下拉列表，并需要知道父值，以便查找它的兄弟值。
1 个解决方案
#1
2
You can query this information from all_constraints (or user_constraints or dba_constraints, of course). Unfortunately, you can only retrieve the name of the constraint a foreign key refers to, so you'll have to use a sub query or a self join to retrieve the referring table:
您可以从all_constraints(当然可以从user_constraints或dba_constraints)查询这些信息。不幸的是，您只能检索外键引用的约束的名称，因此必须使用子查询或自连接来检索引用表:
SELECT r.table_name
FROM user_constraints t
JOIN user_constraints r ON t.r_constraint_name = r.constraint_name
WHERE t.constraint_type = 'R' AND t.table_name = 'SOME_TABLE'
#1
2
You can query this information from all_constraints (or user_constraints or dba_constraints, of course). Unfortunately, you can only retrieve the name of the constraint a foreign key refers to, so you'll have to use a sub query or a self join to retrieve the referring table:
您可以从all_constraints(当然可以从user_constraints或dba_constraints)查询这些信息。不幸的是，您只能检索外键引用的约束的名称，因此必须使用子查询或自连接来检索引用表:
SELECT r.table_name
FROM user_constraints t
JOIN user_constraints r ON t.r_constraint_name = r.constraint_name
WHERE t.constraint_type = 'R' AND t.table_name = 'SOME_TABLE'