Question

我已经得到了以下查询，它可以正常工作，并为我提供了我想要的结果。然而，返回结果需要3秒钟，我发现它太慢了。

任何人都知道更好的方法吗？

SELECT 
    @PrimaryKey = ccu.Column_Name 
FROM 
    INFORMATION_SCHEMA.TABLE_CONSTRAINTS tc
INNER JOIN INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE ccu on 
    tc.CONSTRAINT_NAME = ccu.Constraint_name
WHERE 
    tc.CONSTRAINT_TYPE = 'Primary Key' and 
    tc.Table_Name  = @TableName 
    --tc.Table_Schema = 'LookUp'

Answer 1

我很惊讶您的查询需要很长时间，但您可以通过SQL Server目录视图获取相同的信息：

SELECT c.name
FROM sys.indexes AS i
JOIN sys.index_columns AS ic ON ic.object_id = i.object_id AND ic.index_id = i.index_id
JOIN sys.columns AS c ON c.object_id = ic.object_id AND c.column_id = ic.column_id
WHERE
    i.is_primary_key = 1
    AND i.object_id = OBJECT_ID(N'dbo.YourTable', 'U');

更好的方法，而不是使用INFORMATION_SCHEMA.TABLE_CONSTRAINTS

1 个答案: