MySQL的副位置计数器

Question

我需要得到一个记录集，我填了场1级为每60条记录，意味着我需要填写1级领域是这样的：

• 在POS = 1和POS = 60 1级= 1
上POS = 61和POS = 120 1级
• = 2
• 上POS = 121和POS = 180与1级= 3

... 然后：如果我让' s说我必须为pos = 601和630 level1 = 10设置630条记录，因为我没有660条记录，第630条记录完成了这个级别。

有没有人有一个想法如何以干净的方式做到这一点？

SET @pos:=0; 
SET @posrel:=0; 
SET @level1:=0; 
SELECT id, member_id, member_name, pos, @posrel:=@posrel+1 AS posrel, @level1:=@level1+??? AS level1 
FROM 
(
    SELECT id, member_id, LEFT(member_name, LENGTH(member_name)-36) AS member_name, @pos:=@pos+1 AS pos FROM member_directory WHERE member_name_first= 'A' 
) AS directory_listing 
HAVING pos % 60 IN(0,1); 

Answer 1

-- SET @pos:=0; //Can be moved inside the query. 
-- SET @posrel:=0; 
SELECT inner.*, posrel DIV 60 as level1 FROM (
    SELECT directory_listing.*, @posrel:=@posrel+1 AS posrel AS level1 
    FROM 
    (
    SELECT 
     id 
     , member_id 
     , LEFT(member_name, LENGTH(member_name)-36) AS member_name_first 
     , @pos:=@pos+1 AS pos 
    FROM member_directory 
    CROSS JOIN (SELECT @pos:= 0) x1 
    WHERE member_name_first = 'A' 
    AND directory_listing.pos < 120 
) directory_listing 
    CROSS JOIN (SELECT @posrel:= 0) x2 
) inner 

或许

-- SET @pos:=0; //Can be moved inside the query. 
-- SET @posrel:=0; 
SELECT inner.*, posrel DIV 60 as level1 FROM (
    SELECT directory_listing.*, @posrel:=@posrel+1 AS posrel AS level1 
    FROM 
    (
    SELECT 
     id 
     , member_id 
     , LEFT(member_name, 1) AS member_name_first 
     , @pos:=@pos+1 AS pos 
    FROM member_directory 
    CROSS JOIN (SELECT @pos:= 0) x1 
    WHERE member_name LIKE 'A%' 
    AND directory_listing.pos < 120 
) directory_listing 
    CROSS JOIN (SELECT @posrel:= 0) x2 
) inner