C# 通过查询获取表主键列

它将按id返回所有列。我只需要主键。当我添加以下行时，它是空的：

SELECT [name]
FROM syscolumns 
 WHERE [id] IN (SELECT [id] 
                  FROM sysobjects 
                 WHERE [name] = 'ACTIVITY')
   AND colid IN (SELECT SIK.colid 
                   FROM sysindexkeys SIK 
                   JOIN sysobjects SO ON SIK.[id] = SO.[id]  
                    AND SO.[name] = 'ACTIVITY')

为什么呢？有没有其他方法可以做同样的事情和工作？既然我赶时间

试试这个：

                  WHERE SIK.indid = 1

---

此SQL将查找具有主键的所有表：

Declare @TableName varchar(128)

Set @TableName = 'YourTableName'

SELECT c.COLUMN_NAME as [PrimaryKeyColumns]

FROM    INFORMATION_SCHEMA.TABLE_CONSTRAINTS pk ,              
        INFORMATION_SCHEMA.KEY_COLUMN_USAGE c       
WHERE   pk.TABLE_NAME = @TableName      
AND     CONSTRAINT_TYPE = 'PRIMARY KEY'       
AND     c.TABLE_NAME = pk.TABLE_NAME       
AND     c.CONSTRAINT_NAME = pk.CONSTRAINT_NAME

---

我是从你那儿得到的。还有一些其他示例。

这是我在SQL Server中用于返回表主键的SQL

SELECT 
    i.name AS IndexName,
    OBJECT_NAME(ic.OBJECT_ID) AS TableName,
    COL_NAME(ic.OBJECT_ID,ic.column_id) AS ColumnName
FROM 
    sys.indexes AS i
    INNER JOIN sys.index_columns AS ic
        ON i.OBJECT_ID = ic.OBJECT_ID
        AND i.index_id = ic.index_id
WHERE 
    i.is_primary_key = 1

---

indid=1

仅提供表上聚集索引的相关信息（如果有）。不能保证主键和聚集索引是相同的。这是我找到的唯一只返回PK列名而不返回其他内容的答案。如果这听起来像你的要求，就用这个答案。

DECLARE @TableSchema varchar(255)
SET @TableSchema = 'dbo'
SET @TableName = 'table_name_here'

SELECT 
    ColumnName = col.column_name
FROM    
    information_schema.table_constraints tc               
    INNER JOIN information_schema.key_column_usage col
        ON col.Constraint_Name = tc.Constraint_Name
        AND col.Constraint_schema = tc.Constraint_schema    
WHERE 
    tc.Constraint_Type = 'Primary Key'
    AND col.Table_name = @TableName
    AND col.Table_Schema = @TableSchema