问题描述
遵循 SQL 命令
select TO_CHAR(NVL(arg1 - arg2, TO_DSINTERVAL('0 00:00:00'))) from table1
产生以下格式的结果:+000000000 00:03:01.954000.
produces a result of the format: +000000000 00:03:01.954000.
是否可以在to_char函数中输入特殊格式才能得到格式的结果:+00 00:00:00.000?
Is it possible to enter a special format in the to_char function in order to get a result of format: +00 00:00:00.000?
推荐答案
我意识到它根本不聪明，也不是您正在寻找的特殊格式字符串，但是鉴于输出是固定的，这个答案确实有效长度:
I realize it's not clever at all, nor is it the special format string you're looking for, but this answer does work, given that the output is fixed length:
SELECT SUBSTR(TO_CHAR(NVL(arg1 - arg2, TO_DSINTERVAL('0 00:00:00'))), 1, 1)
|| SUBSTR(TO_CHAR(NVL(arg1 - arg2, TO_DSINTERVAL('0 00:00:00'))), 9, 2)
|| ' '
|| SUBSTR(TO_CHAR(NVL(arg1 - arg2, TO_DSINTERVAL('0 00:00:00'))), 12, 12)
FROM table1;
它也只是截断了小数秒而不是四舍五入，但我从你的例子中假设它们无论如何都只是零.
It also just truncs the fractional seconds instead of rounding, but I assume from your example they're all just zeros anyway.
这是一个更大的尴尬，但我无法抗拒:
This is an even greater embarrassment, but I couldn't resist:
SELECT SUBSTR(REPLACE(TO_CHAR(NVL(arg1 - arg2, TO_DSINTERVAL('0 00:00:00')))
, '0000000', '')
, 1, 16)
FROM table1;
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