2014-11-25 65 views
2

我有一張gr_no,year_dob,family_id等的表。 我想根據family_id排名出生年份,並且無法生成siblings_rank結果。如何根據出生組別和出生年份獲得排名

+----------+--------------+-----------+ 
| gr_no | year_dob  | family_id | siblings_rank 
+----------+--------------+-----------+ 
|  1001 | 1992   | 95  | 1 
| 10234 | 1995   | 95  | 2 
| 10236 | 2004   | 96  | 1 
| 15568 | 2006   | 96  | 2 
|  1225 | 2004   | 92  | 1 
+----------+--------------+-----------+ 

此查詢工作:

SET @prev := null; 

SET @cnt := 1; 

SELECT gr_no, gs_id, gf_id, year_dob, IF(@prev <> gf_id, @cnt := 1, @cnt := @cnt + 1) AS siblings_position, @prev := gf_id as previous_gf_id 
FROM student_registered 
ORDER BY gf_id, year_dob asc 

該查詢也在努力:

SELECT gr_no, gs_id, gf_id, year_dob, IF(@prev <> gf_id, @cnt := 1, @cnt := @cnt + 1) AS siblings_position, @prev := gf_id as previous_gf_id 
FROM student_registered 
JOIN (SELECT @prev := null) p 
JOIN (SELECT @cnt := 1) c 
ORDER BY gf_id, year_dob asc 

...............我不能用這些查詢創建視圖?

或 如果一個過程可以根據查詢更新student_registered列'siblings_position'?

回答

0

視圖

在這裏你不能使用SQL變量是另一種方式使用相關子查詢

SELECT gr_no, family_id,year_dob, 
     (select count(*) from Table1 T1 
     where T1.family_id = T.family_id 
     and T1.year_dob <= T.year_dob) as siblings_position 
FROM Table1 T 
ORDER BY family_id, year_dob asc 
+0

共記錄6019和此查詢SELECT gr_no,gs_id得到同樣的結果,year_dob, gf_id, (SELECT COUNT(*)FROM T1 student_registered其中 = T1.gf_id T.gf_id 和T1.year_dob <= T.year_dob)作爲siblings_position FROM student_registeredŤ ORDER BY gf_id,year_dob ASC爲返回25個結果 – 2014-11-25 05:00:09

+0

@atif Naseem,子查詢不會限制行,位置可能會像25一樣,你能證實嗎?試一下子查詢,看看? – radar 2014-11-25 13:03:58

+0

@AtifNaseem,它工作? – radar 2014-12-01 03:40:57