在oracle數據庫中按列名得到約束名稱

Question

如何獲得Oracle數據庫中相應列的唯一約束名？

換句話說我想通過列名得到約束名。對於這個問題

僞查詢：

select constraint_name from table_name tname where tname.column_name = 'columnName'; 

這可能嗎？

Answer 1

使用Oracle數據字典視圖ALL_CONS_COLUMNS或USER_CONS_COLUMNS（如果要通過列類型來限制它 - 即唯一或主鍵約束 - 那麼您可以在ALL_CONSTRAINTS或USER_CONSTRAINTS加入）：

SELECT acc.constraint_name 
FROM ALL_CONS_COLUMNS acc 
     INNER JOIN ALL_CONSTRAINTS ac 
     ON (acc.CONSTRAINT_NAME = ac.CONSTRAINT_NAME) 
WHERE ac.OWNER  = 'YOUR_SCHEMA_NAME' 
AND ac.TABLE_NAME = 'YOUR_TABLE_NAME' 
AND acc.COLUMN_NAME = 'YOUR_COLUMN_NAME' 
AND ac.CONSTRAINT_TYPE IN ('U', 'P') -- Unique or primary key constraints 

或：

SELECT ucc.constraint_name 
FROM USER_CONS_COLUMNS ucc 
     INNER JOIN ALL_CONSTRAINTS uc 
     ON (ucc.CONSTRAINT_NAME = uc.CONSTRAINT_NAME) 
WHERE uc.OWNER  = 'YOUR_SCHEMA_NAME' 
AND uc.TABLE_NAME = 'YOUR_TABLE_NAME' 
AND ucc.COLUMN_NAME = 'YOUR_COLUMN_NAME' 
AND uc.CONSTRAINT_TYPE IN ('U', 'P')  -- Unique or primary key constraints 

Answer 2

試試這個。

select CONSTRAINT_NAME from USER_CONS_COLUMNS 
where table_name='YOUR_TABLE' 
and column_name='YOUR_COLUMN'