oracle查常用的约束
1、查找表的所有索引(包括索引名,类型,构成列):
select t.*,i.index_type from user_ind_columns t,user_indexes i where t.index_name = i.index_name and t.table_name = i.table_name and t.table_name =要查询的表(注:表名要大写)
select cu.* from user_cons_columns cu, user_constraints au where cu.constraint_name = au.constraint_name and au.constraint_type = 'P' and au.table_name = 要查询的表(注:表名要大写)
select column_name from user_cons_columns cu, user_constraints au where cu.constraint_name = au.constraint_name and au.constraint_type = 'U' and au.table_name = 要查询的表(注:表名要大写)
select * from user_constraints c where c.constraint_type = 'R' and c.table_name = 要查询的表(注:表名要大写)
select * from user_cons_columns cl where cl.constraint_name = 外键名称
select * from user_cons_columns cl where cl.constraint_name = 外键引用表的键名
select t.*,c.COMMENTS from user_tab_columns t,user_col_comments c where t.table_name = c.table_name and t.column_name = c.column_name and t.table_name = 要查询的表(注:表名要大写)