I would like to make a report that will show the average grade for different tasks.
I am having trouble with how to get the averages. I need to figure out how to convert the grades to floats so that I can take the averages. The grades sometimes have non-numeric or null values, although most values look like "2.0" or "3.5". I can exclude anything that is non-numeric.
This is what I have so far:
Select
GradingScores.task As task,
Avg(Cast((SELECT GradingScores.score WHERE GradingScores.score LIKE '%[^0-9]%')As float)) As averages
From
GradingScores
I am using FlySpeed SQL Query.
You could try using IsNumeric
Select
GradingScores.task As task,
Avg(Cast(GradingScores.score as float) As averages
From
GradingScores where IsNumeric(GradingScores.score) = 1
Just simply convert() and use isnumeric() function in T-SQL
select avg(convert(float,score))
from GradingScores
where isnumeric(score)=1
here's what worked for me:
SELECT AVG(CAST(columnName AS FLOAT)) FROM tableName;
Related
I have a table in PostgreSQL, that have a Float column. In my select I use AVG() on that column, so often it gives a number with many decimals. Is there any way to retrict the number of decimals to a maximum of 3, meaning there can be less but not more than 3.
This is the Query:
SELECT team, AVG(score) FROM team_score_table GROUP BY team
You can use round():
select round(val::numeric, 3)
You can also convert to a numeric, but you need a precision appropriate for your values:
select val::numeric(20, 3)
I actually prefer the explicit cast() because it sets the data type of the column to a numeric with an explicit scale -- so downstream apps are aware of the number of decimal places intended in the result.
round() returns a numeric value but it is a "generic" numeric, with no specified scale and precision.
You can see the difference in this example.
You can use a several functions to do that:
SELECT round(42.43666, 2) -- 42.44
SELECT trunc(42.43666, 2) -- 42.43
or cast:
SELECT cast(42.43666 as numeric(20, 2)) -- 42.44
according to your example should be:
SELECT team, round(AVG(score)::numeric, 2) FROM team_score_table GROUP BY team
SELECT team, trunc(AVG(score)::numeric, 2) FROM team_score_table GROUP BY team
SELECT team, cast(AVG(score) as numeric(20,2)) FROM team_score_table GROUP BY team
This is the error I'm receiving below:
Divide by zero error encountered.
Warning: Null value is eliminated by an aggregate or other SET operation.
Having looked around at solutions it looks like I need to use NULLIF or ISNULL, I'm just unsure as to how to include it within the line below.
select
min(round(OnCallTime*100/TotalTime,1)) as total
I'm using SQL Management Studio 2012
Use NULLIF in denominator like below:
select
min(round((OnCallTime*100/NULLIF(TotalTime,0)),1)) as total
So, whenever TotalTime is zero, it'll be replaced by NULL and you will not get the error of Division by Zero.
So in the event TotalTime=0 what do you want to display?. I suggest NULL since divide by zero is not defined?.
You can write the query as follows
select
min(round(
(OnCallTime*100)
/ (case when TotalTime =0 then null else TotalTime end)
,1
)
) as total
use coalesce() function
select
min(round(OnCallTime*100/coalesce(TotalTime,1),1)) as total
use coalesce() which return 1st non null value
select min(round((OnCallTime)*100/coalesce(TotalTime,1),1)) as total
I have a database function that I am able to get the correct results from, but when I try to use SUM to total the results it returns a much higher value.
SELECT
SUM([DATABASE].[dbo].[fn_GetCharges]([TABLE1_DATE],[TABLE1_CUST],[TABLE1_SITE],[TABLE1_SERV])) AS [GROSS_REVENUE]
FROM [DATABASE].[dbo].[TABLE1]
WHERE
[TABLE1_ROUT] = '1234'
AND [TABLE1_DATE] = '2018-05-08'
This returns a SUM value of about 15,740.
If I remove the SUM and GROUP BY the function then it shows each of the returned values, which I manually totalled to about 750.
I'm using Microsoft SQL Server 2014.
We don't know what is in your function, but you could probably output your raw data first and then sum it next.
;WITH cte AS (
SELECT
[DATABASE].[dbo].[fn_GetCharges]([TABLE1_DATE],[TABLE1_CUST],[TABLE1_SITE],[TABLE1_SERV]) AS [GROSS_REVENUE]
FROM [DATABASE].[dbo].[TABLE1]
WHERE
[TABLE1_ROUT] = '1234'
AND [TABLE1_DATE] = '2018-05-08'
GROUP BY whatever_you_grouped_by_that_gave_correct_results
)
SELECT SUM(gross_revenue) AS gross_revenue
FROM cte
Wondering if you used group by clause in the query since I don't see one posted.
Group By (columns) Having (condition). What you specified in the 'where' goes in the 'Having' clause
I want to get value in decimal while calculating averave of column values in select query. For that I have used below query. But the value comes as 3.0 instead of 3.6. Is there any solution for that?
SELECT P.ANSW_ONE,P.ANSW_TWO,P.ANSW_THREE,P.ANSW_FOUR,P.ANSW_FIVE,
CAST(((P.ANSW_ONE+P.ANSW_TWO+P.ANSW_THREE+P.ANSW_FOUR+P.ANSW_FIVE)/5) AS DECIMAL(10,1)) AS ANSW_AVG
FROM FEEDBACK P
CAST the whole SUM instead of the result and use 5.0 just to force it to be decimal instead of integer.
SELECT P.ANSW_ONE,
P.ANSW_TWO,
P.ANSW_THREE,
P.ANSW_FOUR,
P.ANSW_FIVE,
(CAST((P.ANSW_ONE+P.ANSW_TWO+P.ANSW_THREE+P.ANSW_FOUR+P.ANSW_FIVE) DECIMAL(10,1) /5.0)) AS ANSW_AVG
FROM FEEDBACK P
Try This
SELECT
P.ANSW_ONE,
P.ANSW_TWO,
P.ANSW_THREE,
P.ANSW_FOUR,
P.ANSW_FIVE,
CAST(CAST(P.ANSW_ONE+P.ANSW_TWO+P.ANSW_THREE+P.ANSW_FOUR+P.ANSW_FIVE AS DECIMAL(10,1))/5 AS DECIMAL(10,1)) AS ANSW_AVG
FROM FEEDBACK P
Cast the sum before dividing by 5 and then again cast the result
I am working on oracle10g. I was curious to know that is there any SQL function which may give results from the starting alphabet of a string.
For example, if I have road-1, road-A, road-89 and I want to know total number of such road sets without using the sql count() function.
For values that start with road:
SELECT YourColumn, COUNT(*) Total
FROM YourTable
WHERE YourColumn LIKE 'road%'
For values that contains road somewhere:
SELECT YourColumn, COUNT(*) Total
FROM YourTable
WHERE YourColumn LIKE '%road%'