如何在1中合併2個查詢

Question

我有這2個SQL查詢需要加入。

查詢1（顯示Entiries名單）：

SELECT 
    E.EntityId 
    ,E.EntityNo 
    , E.Name 
    , E.ShortName 
FROM [xx].[xx].[Entities] E 
WHERE 
    E.Type = 'A' 
    AND E.YearEndMonth = 6 

QUERY2（顯示聯繫人的列表）：

SELECT P.Firstname,P.LastName, P.Email 
FROM [xxx].[xx].[People] P 
WHERE P.PeopleId= (
    SELECT TOP 1 A.PeopleId 
    FROM [xxx].[xx].[EntityAttentions] A 
    WHERE A.EntityId = ? 
    ORDER BY A.EntityAttentionTypeId ASC 
) 

我的目標是讓實體和聯繫的人的組合列表。

我試過，但有一個有錯誤

SELECT 
    E.EntityId 
    ,E.EntityNo 
    , E.Name 
    , E.ShortName 
    , 
    (SELECT P.Firstname,P.LastName, P.Email 
    FROM [xxx].[xx].[People] P 
    WHERE P.PeopleId= (
     SELECT TOP 1 A.PeopleId 
     FROM [xxx].[xx].[EntityAttentions] A 
     WHERE A.EntityId = E.EntityId 
     ORDER BY A.EntityAttentionTypeId ASC 
    ) 
) 
FROM [xxx].[xx].[Entities] E 
WHERE 
    E.Type = 'A' 
    AND E.YearEndMonth = 6; 

我想我必須使用某種類型的（只有一個表達式可以在選擇列表時，子查詢不與EXISTS引入指定）加入，但不要我不知道該怎麼做。 任何幫助，不勝感激。

Answer 1

試試這個，

SELECT 
    E.EntityId 
    ,E.EntityNo 
    , E.Name 
    , E.ShortName 
    , B.Firstname,B.LastName, B.Email 
FROM [xxx].[xx].[Entities] E 
CROSS APPLY 
( SELECT P.Firstname,P.LastName, P.Email 
     FROM [xxx].[xx].[People] P 
     WHERE P.PeopleId= 
     (
      SELECT TOP 1 A.PeopleId 
      FROM [xxx].[xx].[EntityAttentions] A 
      WHERE A.EntityId = E.EntityId 
      ORDER BY A.EntityAttentionTypeId ASC 
     ) 
) B 
WHERE 
    E.Type = 'A' 
    AND E.YearEndMonth = 6; 

Answer 2

嘗試這一個 -

SELECT 
    E.EntityId 
    , E.EntityNo 
    , E.Name 
    , E.ShortName 
    , P.* 
FROM [xxx].[xx].[Entities] E 
OUTER APPLY (
    SELECT P.Firstname,P.LastName, P.Email 
    FROM [xxx].[xx].[People] P 
    WHERE P.PeopleId = (
     SELECT TOP 1 A.PeopleId 
     FROM [xxx].[xx].[EntityAttentions] A 
     WHERE A.EntityId = E.EntityId 
     ORDER BY A.EntityAttentionTypeId 
    ) 
) P 
WHERE E.Type = 'A' 
    AND E.YearEndMonth = 6;