MySQL实现Oracle或者PostgreSQL的row_numberover这样的排名

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MySQL实现Oracle或者PostgreSQL的row_numberover这样的排名

来源: 作者: 时间:2016-02-02 08:56 【

PostgreSQL 和Oracle 都提供了 row_number() over() 这样的语句来进行对应的字段排名, 很是方便。 MySQL却没有提供这样的语法。
PostgreSQL 和Oracle 都提供了 row_number() over() 这样的语句来进行对应的字段排名, 很是方便。 MySQL却没有提供这样的语法。
Table "ytt.t1" Column | Type | Modifiers --------+-----------------------+----------- i_name | character varying(10) | not null rank | integer | not null
t_girl=# select * from t1 order by i_name; i_name | rank ---------+------ Charlie | 12 Charlie | 12 Charlie | 13 Charlie | 10 Charlie | 11 Lily | 6 Lily | 7 Lily | 7 Lily | 6 Lily | 5 Lily | 7 Lily | 4 Lucy | 1 Lucy | 2 Lucy | 2 Ytt | 14 Ytt | 15 Ytt | 14 Ytt | 14 Ytt | 15 (20 rows)
t_girl=# select i_name,rank, row_number() over(partition by i_name order by rank desc) as rank_number from t1; i_name | rank | rank_number ---------+------+------------- Charlie | 13 | 1 Charlie | 12 | 2 Charlie | 12 | 3 Charlie | 11 | 4 Charlie | 10 | 5 Lily | 7 | 1 Lily | 7 | 2 Lily | 7 | 3 Lily | 6 | 4 Lily | 6 | 5 Lily | 5 | 6 Lily | 4 | 7 Lucy | 2 | 1 Lucy | 2 | 2 Lucy | 1 | 3 Ytt | 15 | 1 Ytt | 15 | 2 Ytt | 14 | 3 Ytt | 14 | 4 Ytt | 14 | 5 (20 rows)



 

t_girl=# select i_name,rank, row_number() over(partition by i_name ) as rank_number from t1;
 i_name  | rank | rank_number 
---------+------+-------------
 Charlie	 |   12 |           1
 Charlie	|   12 |           2
 Charlie	|   13 |           3
 Charlie	|   10 |           4
 Charlie	|   11 |           5
 Lily		|    6 |           1
 Lily		|    7 |           2
 Lily		|    7 |           3
 Lily		|    6 |           4
 Lily		|    5 |           5
 Lily		|    7 |           6
 Lily		|    4 |           7
 Lucy	|    1 |           1
 Lucy	|    2 |           2
 Lucy	|    2 |           3
 Ytt		|   14 |           1
 Ytt		|   15 |           2
 Ytt		|   14 |           3
 Ytt		|   14 |           4
 Ytt		|   15 |           5
(20 rows)



 

t_girl=# select i_name,rank, row_number() over() as rank_number from t1;
 i_name  | rank | rank_number 
---------+------+-------------
 Lily		 |    7 |           1
 Lucy	|    2 |           2
 Ytt		|   14 |           3
 Ytt		|   14 |           4
 Charlie	|   12 |           5
 Charlie	|   13 |           6
 Lily		|    7 |           7
 Lily		|    4 |           8
 Ytt		|   14 |           9
 Lily		|    6 |          10
 Lucy	|    1 |          11
 Lily		|    7 |          12
 Ytt		|   15 |          13
 Lily		|    6 |          14
 Charlie	|   11 |          15
 Charlie	|   12 |          16
 Lucy	|    2 |          17
 Charlie	|   10 |          18
 Lily		|    5 |          19
 Ytt		|   15 |          20
(20 rows)


DELIMITER $$ USE `t_girl`$$ DROP PROCEDURE IF EXISTS `sp_rownumber`$$ CREATE PROCEDURE `sp_rownumber`( IN f_table_name VARCHAR(64), IN f_column_partitionby VARCHAR(64), IN f_column_orderby VARCHAR(64), IN f_is_asc CHAR(4) ) BEGIN -- Created by ytt at 2014/1/10 -- Do a row_number() over() DECLARE i INT; -- Create a temporary table to save result. DROP TABLE IF EXISTS tmp_rownum; SET @stmt = CONCAT('create temporary table tmp_rownum select *,''rownum'' from ',f_table_name,' where 1 = 0'); PREPARE s1 FROM @stmt; EXECUTE s1; SET i = 0; SET @j = 0; SET @v_column_paritionby = ''; -- Check whether parition column is null or not. IF (f_column_partitionby = '' OR f_column_partitionby IS NULL) THEN -- No additional parition column. SET @stmt = CONCAT('insert into tmp_rownum select *,@j:= @j+1 as rownum from ', f_table_name); PREPARE s1 FROM @stmt; EXECUTE s1; ELSE -- Give partition column. SET @stmt = CONCAT('select count(*) from (select count(*) from ',f_table_name,' group by ', f_column_partitionby,') as a into @cnt'); PREPARE s1 FROM @stmt; EXECUTE s1; WHILE i < @cnt DO -- Get the partition value one by one. SET @stmt = CONCAT('select ',f_column_partitionby,' from ',f_table_name,' group by ',f_column_partitionby,' limit ',i,',1 into @v_column_partitionby'); PREPARE s1 FROM @stmt; EXECUTE s1; -- Check whether sort is needed. IF f_column_orderby = '' OR f_column_orderby IS NULL THEN SET @stmt = CONCAT('insert into tmp_rownum select *,@j:= @j+1 as rownum from ', f_table_name,' where ',f_column_partitionby,' = ''',@v_column_partitionby,''''); ELSE SET @stmt = CONCAT('insert into tmp_rownum select *,@j:= @j+1 as rownum from ', f_table_name,' where ',f_column_partitionby,' = ''',@v_column_partitionby,''' order by ',f_column_orderby,' ',f_is_asc); END IF; SET @j = 0; PREPARE s1 FROM @stmt; EXECUTE s1; SET i = i + 1; END WHILE; END IF; -- Reset all session variables. SET @j = NULL; SET @v_column_paritionby = NULL; SET @cnt = NULL; SELECT * FROM tmp_rownum; END$$ DELIMITER ;



 

CALL sp_rownumber('t1','i_name','rank','desc');
query result


i_name	rank	rownum
Charlie	13	1
Charlie	12	2
Charlie	12	3
Charlie	11	4
Charlie	10	5
Lily		7	1
Lily		7	2
Lily		7	3
Lily		6	4
Lily		6	5
Lily		5	6
Lily		4	7
Lucy	2	1
Lucy	2	2
Lucy	1	3
Ytt		15	1
Ytt		15	2
Ytt		14	3
Ytt		14	4
Ytt		14	5

第二种,

 

CALL sp_rownumber('t1','i_name',NULL,NULL);
query result


i_name	rank	rownum
Charlie	12	1
Charlie	13	2
Charlie	11	3
Charlie	12	4
Charlie	10	5
Lily		7	1
Lily		7	2
Lily		4	3
Lily		6	4
Lily		7	5
Lily		6	6
Lily		5	7
Lucy	2	1
Lucy	1	2
Lucy	2	3
Ytt		14	1
Ytt		14	2
Ytt		14	3
Ytt		15	4
Ytt		15	5

第三种,

 

CALL sp_rownumber('t1',NULL,NULL,NULL);
query result


i_name	rank	rownum
Lily		7	1
Lucy	2	2
Ytt		14	3
Ytt		14	4
Charlie	12	5
Charlie	13	6
Lily		7	7
Lily		4	8
Ytt		14	9
Lily		6	10
Lucy	1	11
Lily		7	12
Ytt		15	13
Lily		6	14
Charlie	11	15
Charlie	12	16
Lucy	2	17
Charlie	10	18
Lily		5	19
Ytt		15	20

 


 

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