在SQL中将小时转换为分钟

Question

i'm trying to write a regular expression that will convert the hours into minutes. Currently I have a value which give me the number of hours before the dot and the number of minutes after the dot, for example 6.10 is 6 hours and 10 minute.

Can i use a regular expression to look for the value before the dot and multiply by 60 (to get minutes) and then add the value after the dot (which is already in minutes)?

So as per the example used before, it would do: (6 * 60) + 10

Thank you!

Answer 1

If your value "6.10" is stored as a string, convert it to a number first:

SET @Input = CAST(@InputString AS FLOAT)

Then, use Modulus and Floor .

Total Minutes = The fractional part * 100 + the whole number part * 60.

So if your value 6.10 is contained in a variable named @Input, then you can get the value you wish with

SET @Output = (@Input % 1) * 100 + FLOOR(@Input, 0)  * 60

If it's in a table then something more like this would be appropriate:

SELECT (Input % 1) * 100 + FLOOR(Input, 0) * 60 Output 
FROM   Table

The above only works if minutes are zero padded, eg 6 hours five minutes = 6.05. If you instead represent minutes without padding (6 hours five minutes = 6.5) then use the method that under suggests.

Answer 2

There's a STRTOK function to tokenize a string and then it's just:

select '12.34' as x, 
    cast(strtok(x,'.',1) as int) * 60 + cast(strtok(x,'.',2) as int)

Answer 3

Regular expressions is probably an overkill for such a simple string manipulation. All you need is INDEX function to get the location of the dot and SUBSTR function to get hours and minutes.

Dot position:

 select INDEX([yourstring], '.') 

Hours (before the dot):

 select SUBSTR([yourstring], 1, INDEX([yourstring], '.')  - 1)

Minutes (after the dot):

 select SUBSTR([yourstring], INDEX([yourstring], '.') + 1)