Stack Overflow Asked by Rae Ian on January 8, 2021
Currently I have this kind of query
SELECT
part_number,
part_name,
attenuation_low_end,
attenuation_high_end,
optimum_fermentation_temp_f_low,
optimum_fermentation_temp_f_high
FROM
yeast_module
WHERE
category = 3
AND
(
( `attenuation_low_end` > '31' OR `attenuation_low_end` = '31' )
AND
( `attenuation_high_end` < '40' OR `attenuation_high_end` = '40' )
)
Where I’m trying to get the records with the range of low to high end
from 31 and maximum of 40
But it returns me something like this
As you can notice it seems doesn’t return the data between 31
to 40
Am I doing this right?
UPDATE
I’m expecting no return since, there’s no data between 31-40
You're comparing strings, which performs lexicographic comparisons rather than numeric comparisons. You need to convert to numbers. Adding 0
to a numeric string is a simple way to convert it to a number.
WHERE 0+attenuation_low_end >= 31 AND 0+attenuation_high_end <= 40
Answered by Barmar on January 8, 2021
If you want ranges contained in the 31-40 range:
where attenuation_low_end >= 31 and attenuation_high_end <= 40
If you want ranges that overlap the 31-40 range:
where attenuation_low_end <= 40 and attenuation_high_end >= 31
If your data is of a string datatype, then you need to convert the values to integers so they can be compared as such.
Containment:
where attenuation_low_end + 0 >= 31 and attenuation_high_end + 0 <= 40
Overlap:
where attenuation_low_end + 0 <= 40 and attenuation_high_end + 0 >= 31
Answered by GMB on January 8, 2021
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