Is there any mysql function that helps to display value only after . Suppose if I have a column which has value 45.23 I want only to select .23 as value . The example table can be
test_table
45.23
One method is:
select col - floor(col)
(You might want to tweak this if you have negative values, using abs(col - truncate(col, 0)).)
MySQL also supports the more concise:
select col % 1
To be honest, though, I've never liked this convention (useful as it is) probably because of my background in discreet mathematics.
The RIGHT works as well. Consider this option.
create table numbers(a float);
insert into numbers values (45.23)
select right(a,2) as rem from numbers
db<>fiddle
Related
I have a mysql table column defined as unit_price float(12,4).
If I assign a value of 0.1234, when I create a remote view with dbsetprop, I can retrieve 0.1234 with myview.unit_price.
However, when I use SQL pass-through (SPT) like this:
sqlexec(nHandle, "select * from table", "oResult")
the result of oResult.unit_price only shows 0.12.
How can I ensure that I return the correct, full value?
Not having explicitly tried, you can do some simple math forcing to create larger precision, such as adding an additional column to your query... something like...
select *, unit_price * 1.00000 as UnitPrice5 from...
This will force the field to be computed to 5 decimal position and MIGHT actually change the result column to properly handle this forced decimal capacity. Then, you would use the "UnitPrice5" column instead of "unit_price"...
Don't know if that would be a big issue for you, but once it is in VFP, you have more control too.
The length of the decimal values are defined in your FoxPro settings. Go to Tools->Options->Regional and set the Decimal Digits to a higher value.
I have a table with a decimal column with a lenght = 9 and decimals = 2.
If I put a value of 21.59 (for example) it works ok.
If I put 52.00 it writes only 52. I need to keep 52.00 instead.
Master question: Can the database store the value this way? Instead of
using format/cast in select to retrieve the value...
As noted bellow, this make sense:
"You shouldn't worry about display formatting issues at the database
level but at the ... display level"
Use the FORMAT function:
select format(mycolumn, 2) from mytable;
This also has the effect of adding thousand's separator into the number, so you would get output like 123,456.70. There are workarounds if this doesn't work for you.
Given that MySQL doesn't have the world's best facilities for formatting numbers, display issues like this are usually handled in client code.
Is it possible to find the min value of a column of floating numbers using a mysql function? Suppose I have the following table:
id | value a | 24.88 a | 119.99
If I try:
SELECT MIN(value) FROM [table name] GROUP BY id;
mysql returns:
119.99
After testing this with different floating numbers I believe that this is the case because mysql takes the first character in each of the strings "1" and "2" and then selects a min based on which character is smaller.
I've read through this forum and others trying to find an answer but it seems nobody has raised this problem.
I should mention I've also tried CEIL(value) but that function also seems to have some bugs and I'd prefer to keep the number a floating number and not an integer.
Thanks everyone.
It looks like the column is being stored as a character-based data type. You can solve this in one of two ways:
Change the column type to a numeric type
change the query to add CAST around the value: MIN(CAST(value AS DECIMAL))
The column change might look like this:
ALTER TABLE my_table MODIFY COLUMN value double;
And, as far as I know, MySQL will attempt to convert the data for you. See the note here, which states it "tries".
This maybe an easy one but i couldn't get answer.
I need to select float value from table
example table :-
value
10.2
4.5
4.6
4.06
my query
SELECT * FROM table where value = '4.6'
returns empty result set
how can i solve this !
Generally, you should never check equality with floats (unless, potentially, you have the same object). Internally, it is represented with more precision, even if it isn't showing it to you by the time it outputs to the screen. This basic tenet holds true for computing in general.
There are a dozens of schemes for doing this, but here is a simple one, which should make sense:
SELECT * FROM table where value BETWEEN 4.599 AND 4.601
Use decimal instead of float.
A decimal(10,2) will have 2 and only 2 decimal places and can be compared in the same manner as integers.
Especially for monetairy values you should always use decimal, but anywhere where rounding errors are unwanted, decimal is a good choice.
See: http://dev.mysql.com/doc/refman/5.1/en/precision-math-decimal-changes.html
Or
MySQL DECIMAL Data Type Characteristics
Today, I also came across the same situation and get resolved just by using FORMAT function of MySQL, It will return the results that exactly match your WHERE clause.
SELECT * FROM yourtable WHERE FORMAT(`col`,2) = FORMAT(value,2)
Explanation:
FORMAT('col name',precision of floating point number)
Hope it helps.
You can also try query
SELECT * FROM table WHERE value LIKE 4.6;
you write:
SELECT * FROM table where round(value, 1) = 4.6
I need to set the "Total Price" value to be a two decimal point value like "56.35". Now it's showing fraction values like "56.3566666". I need it to be formatted by MySQL "SELECT" query.
select
format(field, 2) as formatted
from
table
Do note that Format() returns a string, and the result will be with two decimal places (in the above example) - i.e. 100 will be formatted as 100.00.
Documentation.
That works too, but if you need it for further calculations or what not AND you have MySQL > 5.0.8 you could also try:
select
cast(field as decimal(14, 2)) as formatted
from
table
It is a bit more flexible this way! I like flexible...
Hi I thought I wanted FORMAT but didn't like the formatting of the whole number part (with commas)
SELECT ROUND(11000.299, 2);
SELECT ROUND(11000.301, 2);
SELECT ROUND(11000.3, 2);
all three renders 11000.30
SELECT FORMAT(11000.3, 2);
renders 11,000.3