MySQL多重排序/多組查詢

Question

好吧我試圖構造一個查詢，它會給我結果a-z並將它們分組在主類別中。每個結果應該給我每個類別30或更多的列表。然而，這個查詢。

select teamName, CONCAT(UCASE(leagueType)) as league 
from fmr_teamNames 
group by leagueType 
order by teamName asc 

我只會得到每個類別的單個列表。我對某個觀點的理解是因爲我按條件使用了一個組。

當我重新排序查詢一點，並通過條件刪除組，我得到所有列表，但他們在z-a。當預期目標是類別A-Z，然後每個類別內結果A-Z

select teamName, CONCAT(UCASE(leagueType)) as league 
from fmr_teamNames 
order by leagueType asc 

目前這使我對每個結果的類別A-Z和Z-A。所以我有點困惑於如何更好地爲我的結果形成這個查詢，而不必使用像PHP這樣的外部干預來重新排序所有內容。

Answer 1

我想你誤認爲是在MySQL中group_concat功能concat功能。 Concat會將兩個字符串附加在一起，而group_concat會將行合併在一起。

select teamName, group_concat(UCASE(leagueType)) as league 
from fmr_teamNames 
group by teamName 
order by teamName asc 

您的查詢似乎也對被集合列，而不是唯一一個你正在試圖找出使用group by？

例子：

mysql> select * from table1; 
+---------+------+------+-------------+ 
| autonum | ID | name | metavalue | 
+---------+------+------+-------------+ 
|  1 | 1 | Rose | Drinker  | 
|  2 | 1 | Rose | Nice Person | 
|  3 | 1 | Rose | Runner  | 
|  4 | 2 | Gary | Player  | 
|  5 | 2 | Gary | Funny  | 
|  6 | 2 | Gary | NULL  | 
|  7 | 2 | Gary | Smelly  | 
+---------+------+------+-------------+ 
7 rows in set (0.00 sec) 

mysql> select concat(autonum, ID) from table1 group by ID; 
+---------------------+ 
| concat(autonum, ID) | 
+---------------------+ 
| 11     | 
| 42     | 
+---------------------+ 
2 rows in set (0.00 sec) 

mysql> select group_concat(autonum, ID) from table1 group by ID; 
+---------------------------+ 
| group_concat(autonum, ID) | 
+---------------------------+ 
| 11,21,31     | 
| 42,52,62,72    | 
+---------------------------+ 
2 rows in set (0.01 sec)