MySql表按分割字符串的值排序

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我需要表如下結果

RAJ1 RAJ2 ARUN MUTHU 
----------------------- 
86  74 45 null 
74  86 45 null 
null 74 45 86

我不知道從哪裏開始通過對程序或通過正常的查詢來實現這一點。

來源

2011-12-24 arun kumar non ascii

將每個列聯合成一個長列表，將名稱，值拆分爲2列，然後在名稱上進行轉義。由於字符串操作，性能會很慢，但是當我們有非規格化數據時會發生這種情況。 – xQbert 2011-12-24 12:42:24

SELECT 
    COALESCE(
    IF(LEFT(subj1,4)='RAJ1', SUBSTRING(subj1,6), NULL), 
    IF(LEFT(subj2,4)='RAJ1', SUBSTRING(subj2,6), NULL), 
    IF(LEFT(subj3,4)='RAJ1', SUBSTRING(subj3,6), NULL)) as RAJ1, 
    COALESCE(
    IF(LEFT(subj1,4)='RAJ2', SUBSTRING(subj1,6), NULL), 
    IF(LEFT(subj2,4)='RAJ2', SUBSTRING(subj2,6), NULL), 
    IF(LEFT(subj3,4)='RAJ2', SUBSTRING(subj3,6), NULL)) as RAJ2, 
    COALESCE(
    IF(LEFT(subj1,4)='ARUN', SUBSTRING(subj1,6), NULL), 
    IF(LEFT(subj2,4)='ARUN', SUBSTRING(subj2,6), NULL), 
    IF(LEFT(subj3,4)='ARUN', SUBSTRING(subj3,6), NULL)) as ARUN, 
    COALESCE(
    IF(LEFT(subj1,5)='MUTHU', SUBSTRING(subj1,7), NULL), 
    IF(LEFT(subj2,5)='MUTHU', SUBSTRING(subj2,7), NULL), 
    IF(LEFT(subj3,5)='MUTHU', SUBSTRING(subj3,7), NULL)) as MUTHU 
FROM thetable;

來源

2011-12-26 10:47:34 newtover

MySql表按分割字符串的值排序

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