mysql组内排序（分析函数）解决方案

mysql没有分析函数，要想实现组内排序必须自己实现

sql就不分析了 ，只有几行，很简单，基本思想就是自己创建行号。

测试数据：

DROP TABLE test;  

CREATE TABLE test( myNAME VARCHAR(10),name1 VARCHAR(10),COUNT1 BIGINT);  

DELETE FROM test;  

INSERT INTO test VALUES('1','a',2);

INSERT INTO test VALUES('1','b',1);;

INSERT INTO test VALUES('1','c',4);

INSERT INTO test VALUES('1','d',5);

INSERT INTO test VALUES('1','e',7);

INSERT INTO test VALUES('1','f',8);

INSERT INTO test VALUES('2','g',9);

INSERT INTO test VALUES('2','h',0);

  

INSERT INTO test VALUES('2','i',21);

INSERT INTO test VALUES('2','j',3);

INSERT INTO test VALUES('2','k',4);

INSERT INTO test VALUES('2','1',56);

INSERT INTO test VALUES('3','m',67);

INSERT INTO test VALUES('3','n',89);

INSERT INTO test VALUES('3','o',12);

INSERT INTO test VALUES('3','p',22);

INSERT INTO test VALUES('3','q',23);

INSERT INTO test VALUES('3','r',42);

INSERT INTO test VALUES('3','s',26);

实现sql:

SELECT myNAME, name1, COUNT1  

FROM (
SELECT b.myNAME, b.name1, b.count1,  IF(@name = b.myNAME, @rank := @rank + 1, @rank := 1) AS rank,@name:=b.myNAME  

 
FROM (  SELECT myNAME, name1, COUNT1   FROM test ORDER BY myNAME ASC, COUNT1 DESC) b,  

     (  SELECT @rownum := 0, @name := NULL, @rank := 0 ) a

     ) result 

WHERE rank<5;

最终输出：