ORACLE:
1、查主鍵名稱：
select * from user_constraints
where table_name = 'AAA'
and constraint_type ='P';
查主鍵對應的列：
select * from user_cons_columns
where table_name = 'AAA'
and constraint_name = 'PK_AAA'; (PK_AAA 是主鍵名)
2、查索引名稱：
select * from user_indexes
where table_name = 'AAA';
查索引對應的列：
select * from user_ind_columns
where table_name = 'AAA'
and index_name = 'INDX_BA'; (INDX_BA 是 索引名)
了解幾個字典表的用處 如：user_constraints
添加主鍵：
alter table TableName
add constraint PK NAME
primary key("ACCOUNTINGTASKID"...);
刪除主鍵：
alter table EXTRACTED_POSTING(tablle name)
drop constraint EXTRACTED_POSTING_ACCTID_PK;(PK name)