加入表與根據列值值

Question

我有1臺長條桌和1個短表：

長表看起來像這樣：

LongTable: 

+--------------+----------+----------+----------+ 
| Kabelnummer |  GL |more data |even more |   
+--------------+----------+----------+----------+ 
| 1   | 850 | x  | x  | 
+--------------+----------+----------+----------+ 
| 2   | 850 | x  | x  | 
+--------------+----------+----------+----------+ 
| 3   | 1300 | x  | x  | 
+--------------+----------+----------+----------+ 
| 4   | 1300 | x  | x  | 
+--------------+----------+----------+----------+ 

和

ShortTable: 

+--------------+----------+----------+----------+ 
| data   |  GL |more data |numericVal|   
+--------------+----------+----------+----------+ 
|  x  | 850 | x  | 0.2345 | 
+--------------+----------+----------+----------+ 
|  x  | 1300 | x  | 0.2849 | 
+--------------+----------+----------+----------+ 

我想將「numericVal」列複製到表格「LongTable」中的查詢，其中GL.Longtable與GL.shorttable相同：

LongTable: 

+--------------+----------+----------+----------+----------+ 
| Kabelnummer |  GL |more data |even more |numericVal|   
+--------------+----------+----------+----------+----------+ 
| 1   | 850 | x  | x  | 0.2345 | 
+--------------+----------+----------+----------+----------+ 
| 2   | 850 | x  | x  | 0.2345 | 
+--------------+----------+----------+----------+----------+ 
| 3   | 1300 | x  | x  | 0.2849 | 
+--------------+----------+----------+----------+----------+ 
| 4   | 1300 | x  | x  | 0.2849 | 
+--------------+----------+----------+----------+----------+ 

我該怎麼做？

Answer 1

嘗試加入兩個表與INNER JOIN：

SELECT L.*, s.numericVal 
    FROM LongTable l 
    JOIN sortTable s 
    ON l.GL = s.GL 

Answer 2

SELECT lt.Kabelnummer, lt.GL, lt.X, lt.Y, st.numericVal 
FROM LongTable lt 
INNER JOIN ShortTable st ON lt.GL = st.GL 

您使用JOIN做到這一點。

你可以閱讀有關加入這裏：

Join Fundamentals