好像ORACLE中有相應的函數，可惜在MSSQL 或者MySQL中沒有對應的函數。后兩者就得用臨時表來實現了。

create table company
(dep char(10) not null,
val1 int unsigned not null
);
insert into company values
('市場部', 26),
('市場部',25),
('市場部',24),
('辦公室',16),
('辦公室',12),
('研發部',19),
('研發部',11);

1）、循環實現

DELIMITER $$

CREATE DEFINER=`root`@`%` PROCEDURE `sp_generate_auto`()
BEGIN
declare cnt int default 0;
declare i int default 0;
drop table if exists tmp;
-- Temporary table to save the result.
create temporary table tmp like company;
alter table tmp add num int unsigned not null;
select count(1) as total from (select count(1) from company where 1 group by dep) T into cnt;
while i < cnt
do
set @stmt = concat('select dep from company where 1 group by dep order by dep asc limit ',i,',1 into @t_dep');
prepare s1 from @stmt;
execute s1;
deallocate prepare s1;
set @stmt = NULL;
set @num = 0;
set @stmt2 = concat('insert into tmp select dep,val1,@num := @num + 1 as sequence from company where dep = ''',@t_dep,''' order by dep asc');
prepare s1 from @stmt2;
execute s1;
deallocate prepare s1;
set @stmt2 = NULL;
set i = i + 1;
end while;
select * from tmp;
set @t_dep = NULL;
END$$

DELIMITER ;

2）、游標實現

DELIMITER $$



DROP PROCEDURE IF EXISTS `sp_generate_auto_cursor`$$



CREATE DEFINER=`root`@`%` PROCEDURE `sp_generate_auto_cursor`()

BEGIN

??declare done1 int default 0;

??declare a char(10);

??declare i int unsigned default 0;
-- Cursor one to get the group total
??declare cur1 cursor for select dep from company group by dep;

??declare continue handler for 1329 set done1 = 1;

-- Temporary table to save the result.
??drop table if exists tmp;

??create table tmp like company;

??alter table tmp add num int unsigned not null;

??open cur1;

??while done1 != 1

??do

????fetch cur1 into a;

????if not done1 then

??????set @i = 0;

??????begin

??????declare done2 int default 0;

??????declare b int unsigned default 0;

??????declare c int unsigned default 0;
-- Cursor two to get per group total.
??????declare cur2 cursor for select val1,@i := @i + 1 from company where dep = a;

??????declare continue handler for 1329 set done2 = 1;

????????open cur2;

????????while done2 <> 1

????????do

??????????fetch cur2 into b,c;

??????????if not done2 then

????????????insert into tmp select a,b,c;

??????????end if;

????????end while;

????????close cur2;

??????end;

????end if;

??end while;

??close cur1;

??select * from tmp;

END$$



DELIMITER ;




call sp_generate_auto();
call sp_generate_auto_cursor();

query result(7 records)

dep	val1	num
辦公室	16	1
辦公室	12	2
市場部	26	1
市場部	25	2
市場部	24	3
研發部	19	1
研發部	11	2

uery result(7 records)

dep	val1	num
辦公室	16	1
辦公室	12	2
市場部	26	1
市場部	25	2
市場部	24	3
研發部	19	1
研發部	11	2

(7 row(s)returned)
(15 ms taken)

(0 row(s)affected)
(0 ms taken)

(7 row(s)returned)
(16 ms taken)

(0 row(s)affected)
(0 ms taken)

轉載于:https://www.cnblogs.com/secbook/archive/2008/07/30/2655295.html

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