日期差的火候分秒表示SQL（转）

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文章出自：http://blog.csdn.net/wzy0623/article/details/7684513

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MySQL实现方式：

SET @a:=UNIX_TIMESTAMP(NOW()) - UNIX_TIMESTAMP(CURRENT_DATE());-- 可以直接将set中变量a的值写入SQL语句中SELECT CONCAT(IF(TRUNCATE(@a/24/3600,0)=0,'',CONCAT(TRUNCATE(@a/24/3600,0),'天')),              IF(MOD(TRUNCATE(@a/3600,0),24)=0,'',CONCAT(MOD(TRUNCATE(@a/3600,0),24),'小时')),              IF(MOD(TRUNCATE(@a/60,0),60)=0,'',CONCAT(MOD(TRUNCATE(@a/60,0),60),'分')),              IF(MOD(@a,60)=0,'',CONCAT(MOD(@a,60),'秒'))) dt_diff;

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oracle实现方式：

WITH a             AS (SELECT   SYSDATE - TRUNC(SYSDATE) tt                   FROM DUAL)        SELECT    DECODE (TRUNC (tt, 0), 0, NULL, TRUNC (tt, 0) || '天')               || DECODE (TRUNC (MOD (tt, 1) * 24, 0),                          0, NULL,                          TRUNC (MOD (tt, 1) * 24, 0) || '小时')               || DECODE (TRUNC (MOD (tt * 24, 1) * 60, 0),                          0, NULL,                          TRUNC (MOD (tt * 24, 1) * 60, 0) || '分')               || DECODE (ROUND (MOD (tt * 24 * 60, 1) * 60, 0),                          0, NULL,                          ROUND (MOD (tt * 24 * 60, 1) * 60, 0) || '秒')                  dt_diff          FROM a;

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