限制SQL加入到只有前3項連接表

Question

考慮這個CTE

;WITH Columns AS 
(
    SELECT object_id AS TableId, Name AS ColumnName 
    FROM SYS.columns 
), 
Tables AS 
(
    SELECT S.NAME AS SchemaName, T.NAME AS TableName, object_id AS TableId 
    FROM sys.tables T 
    INNER JOIN sys.schemas S ON S.schema_id = T.schema_id 
) 
SELECT T.SchemaName, T.TableName, C.ColumnName 
FROM Tables T 
INNER JOIN Columns C ON T.TableId = C.TableId 

我想要做的是限制列的只有結果是前三（比如按字母順序例如訂購）

所以，如果我有1種模式（例如，DBO）有2代表的TableX & TableY與4周的cols每個可樂，COLB，COLC，冷我的結果將是 像

dbo TableX ColA 
    dbo TableX ColB 
    dbo TableX ColC 
    dbo TableY ColA 
    dbo TableY ColB 
    dbo TableY ColC 

schema_a

Answer 1

看起來像我找到答案:-)

Select Top row of 2nd table in SQL Join

;WITH Columns AS 
(
    SELECT 
     row_number() over (partition by object_id ORDER BY Name DESC) as RowNumber, 
     object_id AS TableId, 
     Name AS ColumnName 
    FROM SYS.columns 
), 
Tables AS 
(
    SELECT 
     S.NAME AS SchemaName, 
     T.NAME AS TableName, object_id AS TableId 
    FROM sys.tables T 
    INNER JOIN sys.schemas S ON S.schema_id = T.schema_id 
) 
SELECT T.SchemaName, T.TableName, C.RowNumber, C.ColumnName 
FROM Tables T 
INNER JOIN Columns C ON T.TableId = C.TableId 
where RowNumber BETWEEN 1 AND 3