I have about 70 million rows of data with a column that contains numbers, but it's in a float format. I need to get rid of the last 4 digits of that column i.e. I need to turn this
60871003002001
60871003002002
60871003002003
into this
6087100300
6087100300
6087100300
When I run the query
select top 3 LEFT(COLUMN, LEN(COLUMN)-4) as a from TABLE
it returns the following:
6.0871e
6.0871e
6.0871e
Does anyone know why? I'm using SQL Server. There are no nulls and each number is from 12 to 15 digits long.
Thank you!
Instead, divide by 1000 and turn into a decimal:
select cast( (col / 10000) as decimal(18, 0))
The problem you are facing is that the default conversion of a float to a string might sometimes be in scientific notation.
Related
I have a data set with inconsistencies in a column with double values. Some are displayed as eg. 24.55, and others as 24.5 or 24. I want all values to be displayed to 2 decimals, so 24 should be 24.00, and 23.1 should be 23.10 etc. What code would work in this instance?
In general, such conversions are both database-specific and GUI-specific. However, the database can convert the value to something with two decimal places by using numeric/decimal (those are equivalent):
select cast(value as numeric(10, 2))
The "2" is the two digits after the decimal place. This should be displayed with two digits -- in any reasonable interface.
If you are using MySQL (as PHP suggests), you can use the format() function to accomplish this:
select format(value, 2)
I have 2 columns which I need to divide sum(cola)/sum(ColB), but I am not getting the desired results since SQL server seems to truncate values after decimal
For eg. I have-
select 281370/1035
is giving 271 using simple division, whereas actual result of division is 271.8550724637681 and I want to display 271.8
I tried
SELECT cast(round(281370/1035,1) as numeric(36,1))
but that results 271.0
In SQL Server, you have to cast the integers to decimal and you could use Round to get desired precision.
SELECT cast(Round(CAST(281370 AS decimal) / CAST(1035 AS decimal),1,1) as decimal(10,1))
The problem is that you given the int number and want a decimal result
try this
select convert(decimal(30,10),281370.0/1035.0)
or
select Round(convert(decimal(30,10),281370.0/1035.0),1,1)
#Stormcloak gives the answer to specifically wanting a single position as a mantissa, however to return an exact answer you could "simply" implicitly change the datatype.
select 281370.0/1035
Returns:
271.855072
In Presto DB:
select (CAST(11 as decimal(8,6))/CAST(7 as decimal(8,6))) as result
result:1.571429
decimal(xp,xs)
xp--> total number of digits(before decimal point+ after decimal
point)
xs--> number of digits after the decimal point
reference: https://prestodb.io/docs/current/functions/decimal.html
select round((cast(56/3 AS DECIMAL (4,2))),1)
is showing 18 output instead of 19 , where as actual value is 18.66.
My Round function is not working
please help.
The problem is 56/3 is an integer calculation which means no floating point numbers.
You need to use floating point numbers in the initial calculation e.g. 56.0/3. Also, if you want to round to 19 then you need to round to the nearest whole number, ROUND(x, 1) will round to the first decimal place - you need to pass 0 to round up to 19.
SELECT ROUND((CAST(56.0/3 AS DECIMAL (4,2))),0)
Alternatively, you could switch ROUND for CEILING
select CEILING(CAST(56.0/3 AS DECIMAL(4,2)))
Your section of the code:
CAST( 56/3 AS DECIMAL )
First evaluates the 56/3 which returns 18. This is then cast to decimal, giving 18.0.
You need to cast either the numerator or denominator before the division occurs.
The round function is working fine -- it's just not using the input you think it is.
Convert one of your integer values before you divide the numbers:
select round(56/convert(DECIMAL (4,2),3),0);
If you do not so you divide integers which results in 18 not 18.66
want to convert character format (00001000000) as 10000.00. Please help me.
I've already tried with
select to_number('00012300','9999999999.99','nls_numeric_characters = ''.,''') from dual
this script but it can show only 12300, actually i want to view as 123.000
Well, you can convert your value to a number using
select to_number('00012300') from dual;
It seems that you divide by 100.
So
select to_number('00012300') / 100 from dual;
If you want to display two decimals, back to a varchar again, with a format
select to_char(to_number('00012300') / 100, '999999D99') from dual;
What you simply may use, is a workaround like that:
CAST(round(0000000111100 / 100, 2) AS numeric(38, 2))
So what you do is that you round your value by 2 decimal places while dividing by 100 and then casting it to to a numeric with a 2 piece left-over.
If your value is a string, just simply convert it to an integer before.
Peace
I am using sql server 2000 and facing round function issue like the following statement working fine.
SELECT ROUND(5 * 7.83, 1)
The result will be 39.2
But when I get these values from the table, it gives 39.1, meaning it truncates and does not round up.
SELECT ROUND(rate * qty, 1)
FROM tbl
The result will be 39.1
rate and qty columns data types are float. Insert 5 in qty and 7.83 in rate, then check it. How I can fix it?
Convert the table values to real,
SELECT ROUND(convert(real,rate)*convert(real,qty),1)
Your sample simply query is not reflective of the data types involved.
Try these two instead:
SELECT ROUND(5 * 7.83, 1)
SELECT ROUND(cast(5 as float) * cast(7.83 as float), 1)
The 2nd one matches your table data types. Float datatypes are not meant for precise decimal calculations, use a decimal type for those instead.
What Every Computer Scientist Should Know About Floating-Point Arithmetic
Without losing too much precision for normal numbers, you can just cast to decimal on the fly to force human-comprehensible decimal arithmetics, e.g.
SELECT ROUND(cast(rate as decimal(10,5)) * cast(qty as decimal(10,5), 1)
FROM tbl