我希望能够在SQL Server 2005中以某种方式做的事情是使用表名作为输入来确定组成主键的所有字段。 sp_columns
似乎没有这个字段。任何想法在哪里看?如何确定SQL Server中表的主键?
回答
我用这一个代码生成器,我写来获取主键:
SELECT i.name AS IndexName,
OBJECT_NAME(ic.OBJECT_ID) AS TableName,
COL_NAME(ic.OBJECT_ID,ic.column_id) AS ColumnName,
c.is_identity, c.user_type_id, CAST(c.max_length AS int) AS max_length,
CAST(c.precision AS int) AS precision, CAST(c.scale AS int) AS scale
FROM sys.indexes AS i
INNER JOIN sys.index_columns AS ic
INNER JOIN sys.columns AS c ON ic.object_id = c.object_id AND ic.column_id = c.column_id
ON i.OBJECT_ID = ic.OBJECT_ID AND i.index_id = ic.index_id
WHERE i.is_primary_key = 1 AND ic.OBJECT_ID = OBJECT_ID('dbo.YourTableNameHere')
ORDER BY OBJECT_NAME(ic.OBJECT_ID), ic.key_ordinal
- ANSI SQL兼容和SQL70开始工作:
select kcu.TABLE_SCHEMA, kcu.TABLE_NAME, kcu.CONSTRAINT_NAME, tc.CONSTRAINT_TYPE, kcu.COLUMN_NAME, kcu.ORDINAL_POSITION
from INFORMATION_SCHEMA.TABLE_CONSTRAINTS as tc
join INFORMATION_SCHEMA.KEY_COLUMN_USAGE as kcu
on kcu.CONSTRAINT_SCHEMA = tc.CONSTRAINT_SCHEMA
and kcu.CONSTRAINT_NAME = tc.CONSTRAINT_NAME
and kcu.TABLE_SCHEMA = tc.TABLE_SCHEMA
and kcu.TABLE_NAME = tc.TABLE_NAME
where tc.CONSTRAINT_TYPE in ('PRIMARY KEY', 'UNIQUE')
order by kcu.TABLE_SCHEMA, kcu.TABLE_NAME, tc.CONSTRAINT_TYPE, kcu.CONSTRAINT_NAME, kcu.ORDINAL_POSITION;
- SQL Server 2005的具体:
select s.name as TABLE_SCHEMA, t.name as TABLE_NAME
, k.name as CONSTRAINT_NAME, k.type_desc as CONSTRAINT_TYPE
, c.name as COLUMN_NAME, ic.key_ordinal AS ORDINAL_POSITION
from sys.key_constraints as k
join sys.tables as t
on t.object_id = k.parent_object_id
join sys.schemas as s
on s.schema_id = t.schema_id
join sys.index_columns as ic
on ic.object_id = t.object_id
and ic.index_id = k.unique_index_id
join sys.columns as c
on c.object_id = t.object_id
and c.column_id = ic.column_id
order by TABLE_SCHEMA, TABLE_NAME, CONSTRAINT_TYPE, CONSTRAINT_NAME, ORDINAL_POSITION;
当然你会想添加一个“where”子句。 Where TABLE_NAME ='mytable' – ChickenMilkBomb 2009-08-28 21:12:40
@Nick您可以编辑帖子而不是添加评论,也可以添加一些代码格式,因为您的查询不容易阅读 对于ANSI方法,虽然 – MattH 2009-08-28 21:23:39
SHEEESH!学习将代码格式化为代码 - 突出显示一个部分,然后单击工具栏中的“代码”按钮(010 101) - 请! – 2009-08-28 21:28:15
试试这个:
SELECT *
FROM INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE
WHERE table_name = 'your_table_name'
AND constraint_name LIKE 'PK%'
select *
from information_schema.Table_Constraints
where Table_Name = @tableName
这不会获得主键中涉及的列名称 – MattH 2009-08-28 21:21:44
我通常发现...
sp_help <table>
给了我一切,我需要知道有关表(包括索引信息)。
实际上,主键是不同于表上的索引。也不是聚集索引。是约束,所以要寻找它的适当位置是sys.key_constraints
:
select ic.key_ordinal, cl.name, ic.is_descending_key
from sys.key_constraints c
join sys.indexes i on c.parent_object_id = i.object_id
and c.unique_index_id = i.index_id
join sys.index_columns ic on ic.object_id = i.object_id
and ic.index_id = i.index_id
join sys.columns cl on cl.object_id = i.object_id
and ic.column_id = cl.column_id
where c.type = 'PK'
and 0 = ic.is_included_column
and i.object_id = object_id('<tablename>')
order by ic.key_ordinal
在SQL2005这个带回一排名称的主键,然后在“的index_keys”
给出了列的列表sp_help myTable
最后我用这个...
select cu.constraint_catalog,
cu.constraint_schema,
cu.table_name,
cu.constraint_name,
constraint_type,
column_name,
ordinal_position
from information_schema.key_column_usage cu
join information_schema.table_constraints as tc
on tc.constraint_catalog = cu.constraint_catalog and
tc.constraint_schema = cu.constraint_schema and
tc.constraint_name = cu.constraint_name and
tc.table_name = cu.table_name
where cu.table_name = 'table_name_goes_here'
order by constraint_name, ordinal_position
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? – 2009-08-28 21:08:10