mysql沒有分析函式，要想實現組內排序必須自己實現

sql就不分析了 ，只有幾行，很簡單，基本思想就是自己建立行號。

測試資料：

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);

實現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;

最終輸出：