Question

我有2个桌子，我想计算出行次数。

tbl1
id location
1   A
2   B
3   C

tabl 2
id  tabl1id table1id
1     1       2
2     1       3
3     2       1
4     3       1
5     1       3
6     1       3

我想要这样的结果，我想算一下

SrNo  A To B   A to C   B To A   C To A
 1     1         3       1         1

Answer 1

这可能有助于你...

DECLARE @tbl1 TABLE
(
    id INT , location VARCHAR(1)
)DECLARE @tbl2 TABLE
(
    id INT , tabl1id INT , table1Toid INT
)
INSERT INTO  @tbl1
SELECT  1 ,  'A' UNION ALL
SELECT  2 ,  'B'  UNION ALL
SELECT  3 ,  'C'

INSERT INTO  @tbl2
SELECT      1 ,    1,       2 UNION ALL
    SELECT  2  ,   1  ,     3 UNION ALL
SELECT      3  ,   2  ,     1 UNION ALL
SELECT      4  ,   3  ,     1 UNION ALL
SELECT      5  ,   1   ,    3 UNION ALL
SELECT      6  ,   1   ,    3

SELECT * FROM 
(
SELECT COUNT(tabl1id) CNT , (SELECT location FROM @tbl1 WHERE ID=T2.tabl1id)+' To '+(SELECT location FROM @tbl1 WHERE ID=T2.table1Toid) AS location
FROM @tbl2 T2
GROUP BY tabl1id,table1Toid
)D
PIVOT (MIN(CNT) FOR location  IN ([B To A],[C To A],[A To B],[A To C])) AS PVT

Answer 2

如果要查看行（而不是列）中的结果，您可以通过按两列分组来完成此操作：

SELECT src , dest, count(id) 
FROM tbl2 
GROUP BY src , dest

了解更多信息，请参阅MySQL GROUP BY two columns

Sql group by Multiple Columns

2 个答案: