我需要在SQL Server数据库中删除一个高度引用的表。我如何才能得到所有外键约束的列表,我将需要删除以便删除表?
(SQL比在管理工作室的GUI中点击更可取)
我需要在SQL Server数据库中删除一个高度引用的表。我如何才能得到所有外键约束的列表,我将需要删除以便删除表?
(SQL比在管理工作室的GUI中点击更可取)
当前回答
通过@Gishu所做的工作,我能够在SQL Server 2005中生成并使用以下SQL
SELECT t.name AS TableWithForeignKey, fk.constraint_column_id AS FK_PartNo,
c.name AS ForeignKeyColumn, o.name AS FK_Name
FROM sys.foreign_key_columns AS fk
INNER JOIN sys.tables AS t ON fk.parent_object_id = t.object_id
INNER JOIN sys.columns AS c ON fk.parent_object_id = c.object_id
AND fk.parent_column_id = c.column_id
INNER JOIN sys.objects AS o ON fk.constraint_object_id = o.object_id
WHERE fk.referenced_object_id = (SELECT object_id FROM sys.tables
WHERE name = 'TableOthersForeignKeyInto')
ORDER BY TableWithForeignKey, FK_PartNo;
在一个查询中显示表,列和外键名称。
其他回答
以下是我认为在SQL Server 2016中处理这种情况的最佳实践。
你必须列出外键使用:
EXEC sp_fkeys 'TableName'
在这里你可以看到fk的全部信息。注意列FKTABLE_NAME, FKCOLUMN_NAME, FK_NAME, UPDATE_RULE, DELETE_RULE是你需要删除外键并在截断后再次实现它们的信息。
你可以组织一个脚本如下:
-- EXEC sp_fkeys 'TableName'
-- DROP CONSTRAINTS: I drop one, here drop every constraint you desire.
BEGIN TRANSACTION
GO
ALTER TABLE dbo.TableName
DROP CONSTRAINT IF EXISTS FK_TableName_OtherTable
GO
ALTER TABLE dbo.TableName SET (LOCK_ESCALATION = TABLE)
GO
COMMIT
-- TRUNCATE
BEGIN TRANSACTION
TRUNCATE TABLE TableName
GO
COMMIT
-- RECREATE CONSTRAINTS: I recreate 1, here recreate every fk you desire
BEGIN TRANSACTION
GO
ALTER TABLE dbo.TableName SET (LOCK_ESCALATION = TABLE)
GO
ALTER TABLE dbo.TableName ADD CONSTRAINT
FK_TableName_OtherTable FOREIGN KEY
(
Id_FK
) REFERENCES dbo.OtherTable
(
Id
) ON UPDATE NO ACTION
ON DELETE NO ACTION
GO
COMMIT
** UPDATE_RULE和DELETE_RULE的值可以在sp_fkeys的文档中看到:
最简单的方法是使用sys。SQL中的foreign_keys_columns。这里的表包含了所有外键的对象ID,包括它们的引用列ID、引用表ID以及引用列和表。由于Id保持不变,因此对于Schema和表中的进一步修改,结果将是可靠的。
查询:
SELECT
OBJECT_NAME(fkeys.constraint_object_id) foreign_key_name
,OBJECT_NAME(fkeys.parent_object_id) referencing_table_name
,COL_NAME(fkeys.parent_object_id, fkeys.parent_column_id) referencing_column_name
,OBJECT_SCHEMA_NAME(fkeys.parent_object_id) referencing_schema_name
,OBJECT_NAME (fkeys.referenced_object_id) referenced_table_name
,COL_NAME(fkeys.referenced_object_id, fkeys.referenced_column_id)
referenced_column_name
,OBJECT_SCHEMA_NAME(fkeys.referenced_object_id) referenced_schema_name
FROM sys.foreign_key_columns AS fkeys
我们还可以使用where添加过滤器
WHERE OBJECT_NAME(fkeys.parent_object_id) = 'table_name' AND
OBJECT_SCHEMA_NAME(fkeys.parent_object_id) = 'schema_name'
SELECT
OBJECT_NAME(parent_object_id) 'Parent table',
c.NAME 'Parent column name',
OBJECT_NAME(referenced_object_id) 'Referenced table',
cref.NAME 'Referenced column name'
FROM
sys.foreign_key_columns fkc
INNER JOIN
sys.columns c
ON fkc.parent_column_id = c.column_id
AND fkc.parent_object_id = c.object_id
INNER JOIN
sys.columns cref
ON fkc.referenced_column_id = cref.column_id
AND fkc.referenced_object_id = cref.object_id where OBJECT_NAME(parent_object_id) = 'tablename'
如果你想获得所有表的外键关系,排除where子句,否则写你的tablename而不是tablename
@BankZ的最好回答
sp_help 'TableName'
另外,对于不同的模式
sp_help 'schemaName.TableName'
Oracle SQL
select *
from
all_constraints
where
r_constraint_name in
(select constraint_name
from
all_constraints
where
table_name='PUT_THE_TABLE_NAME_HERE');
all_constraints是Oracle DB中的一个固有表名。