Mysql通过排序返回行位置

Question

ff表：

+-----------------------------+
+ value| name   |Asort        +
+-----------------------------+
+  111 | Alpha  |a            +
+  161 | Beta   |b            +
+  092 | Delta  |c            +
+  141 | Beta   |a            +
+  113 | Beta   |e            +
+  092 | Delta  |f            +
+  ...                        +
+  ... | more items           +
+-----------------------------+




+-----------------------------+
+ value| name |Asort          +
+-----------------------------+
+  141 | Beta |a              +
+  161 | Beta |b              +
+  113 | Beta |c              +
+  ...                        +
+  ... | more items(Beta)     +
+-----------------------------+

我想要回归＆＃34; 3＆＃34; as＆＃34; 113＆＃34;行位置，按名称分组，按Asort排序ASC

Answer 1

您需要使用变量来计算排名（row-number-in-mysql），因为mySql没有ROW_NUMBER。

SQL Fiddle Demo

SELECT ff.*, 
       @rownum := @rownum + 1 AS rank
  FROM ff, 
       (SELECT @rownum := 0) r
WHERE name = 'Beta'  
ORDER BY Asort