将类似的列添加到一列SQL中

Question

我试图根据trackid显示记录表的计数。

我的ToTransaction专栏中的一些条目非常相似：Toshi-A，Toshi-B，Toshi-C，Tosan，Toki，Toto

我在查询中要做的是在一行中显示所有Toshi，同时仍然给Tosan，Toki和Toto他们自己的行。

Route  ToTransaction  Count
 F43   Toshi          100
 F43   Tosan          200
 F43   Toki           75
 F43   Toto           125

而不是

Route  ToTransaction  Count
 F43   Toshi-A          35
 F43   Toshi-B          25
 F43   Toshi-C          22
 F43   Toshi-D          18  
 F43   Tosan          200
 F43   Toki           75
 F43   Toto           125


SELECT Route, ToTransaction, count(TrackID) as 'Count' from TestDB
group by Route, ToTransaction

Answer 1

试试这个：

SELECT IF(SUBSTR(ToTransaction,1,5)="Toshi","Toshi",ToTransaction) as "Trans",
COUNT(TracID) as "Count" from TestDB
GROUP BY Trans;

Answer 2

如果你总是使用“ - ”作为分隔符并且“ - ”字符之前的字符数是动态的，你可以使用substring_index：

对于MySQL：

SELECT substring_index(ToTransaction,'-',1) as "Trans",
COUNT(TracID) as "Count" from TestDB 
GROUP BY 1;

对于MSSQL（我无法尝试，但它应该工作）：

SELECT CASE WHEN CHARINDEX('-',ToTransaction) > 1 
   THEN LEFT(ToTransaction,CHARINDEX('-',ToTransaction)-1) 
   ELSE ToTransaction 
END as "Trans",
COUNT(TracID) as "Count" from TestDB GROUP BY Trans;