如何確定復合鍵中的列位置

Question

我需要確定數據庫中的所有主鍵。 以下代碼似乎可以很好地完成此工作：

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

我的問題是某些鍵是復合鍵。 此查詢標識哪些鍵是復合鍵（sys.indexes表中特定indexName的多行），但未顯示順序。 我需要知道這一點，因為：

PRIMARY KEY CLUSTERED 
(
[bl_id] ASC,
[fl_id] ASC,
[rm_id] ASC
)

與以下內容不同：

PRIMARY KEY CLUSTERED 
(
[rm_id] ASC
[fl_id] ASC,
[bl_id] ASC,

）

Answer 1

key_ordinal似乎可以解決問題：

SELECT i.name AS IndexName,
   OBJECT_NAME (ic.OBJECT_ID) AS TableName,
   COL_NAME (ic.OBJECT_ID, ic.column_id) AS ColumnName,
   ic.Key_ordinal as ColumnOrder
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
ORDER BY ic.OBJECT_ID, ic.Key_ordinal