如何獲得加入行

Question

的計數有這個SQL語句

SELECT t1.Name 
    ,Count(t2.SubID) Totals -- I don't know how to do it. 
    FROM Table t1 
    INNER JOIN Table2 t2 ON t1.ID = t2.SubID 

感謝。

Answer 1

猜測 ...改變連接，並添加GROUP BY

SELECT t1.Name 
,Count(t2.SubID) AS Totals 
FROM Table t1 
LEFT OUTER JOIN Table2 t2 ON t1.ID = t2.SubID 
GROUP BY t1.Name 

的LEFT OUTER JOIN讓你找到你可以給一個樣本每t1.Name

Answer 2

SELECT t1.Name, Count(t2.SubID) Totals 
FROM Table t1 
INNER JOIN Table2 t2 ON t1.ID = t2.SubID 
GROUP BY t1.Name