將列組合成一列SQL Server

Question

我想要做的是將多個列組合成一個列。假設我有一張名爲Player的表格，此表格包含多列，例如name, team, goalie, left back, right back, center back , left midfield.... and description。

的description柱將包含name + team + left back，所以description將Ronaldo - Madrid - Forward。當玩家只有一個位置時，我可以填充描述列，但不能超過一個位置？

我的SQL：

select 
    name, team, goalie, 
    leftback, rightback, centerback, 
    left midfield, 
    ......, 
    name + ' - ' + team + ' - '+ 
    CASE 
     WHEN goalie = 'yes' THEN 'Goalie' 
     WHEN leftback = 'yes' THEN 'Left Back' 
     WHEN rightback = 'yes' THEN 'Right Back' 
     WHEN centerback = 'yes' THEN 'Center Back' 
     ....... 
    END AS Description 
from 
    player 

輸出：

Ronaldo - Madrid - Forward 

我怎樣才能得到它添加一個以上的位置，如果玩家有不止一個？

感謝

Answer 1

select 
    name, 
    team, 
    CASE WHEN goalie = 'yes'  THEN 'Goalie - '  ELSE '' END + 
    CASE WHEN leftback = 'yes' THEN 'LeftBack - ' ELSE '' END + 
    CASE WHEN rightback = 'yes' THEN 'RightBack - ' ELSE '' END + 
    CASE WHEN center back = 'yes' THEN 'Center Back - ' ELSE '' END AS Description 

而且你要使用的描述刪除最後一個-

版本的SQL Server +2012

WITH cte as (
    SELECT 
     name, 
     team, 
     IIF(goalie = 'yes',  'Goalie - ', '') + 
     IIF(leftback = 'yes', 'LeftBack - ', '') + 
     IIF(rightback = 'yes', 'RightBack - ', '') + 
     IIF(center back = 'yes', 'Center Back - ', '') AS Description 
    FROM Players 
) 
SELECT name, 
     team, 
     CASE LEN(Description) 
      WHEN 0 THEN Description 
      ELSE LEFT(Description, LEN(Description) - 3) 
     END 
FROM cte 

入住的版本註釋STUFF

Answer 2

我不是的粉絲聲明，並傾向於避免他們，當我可以。你可以逃脫這樣的：

select stuff (
       isnull(replace(replace(goalie,'no',''),'yes',' - Goalie'),'') 
      + isnull(replace(replace(leftback,'no',''),'yes',' - Leftback'),'') 
      + isnull(replace(replace(rightback,'no',''),'yes',' - Rightback'),'') 
       .... 
       ,1,3,'' 
      ) as 'Description' 
    from Player 

如果goalie之類的值只有「是」，「否」和NULL。