I've got a dataset with a bunch of rows for monthly salary payments for each account. we have 6 columns for this -
Salary_1, Salary_2, Salary_3, Salary_4, Salary_5 and Salary_6.
Sometimes salaries 3, 4, 5, 6 and occasionally 2 aren't populated, sometimes none are populated because they're unemployed. In this case, we have 0 in the field.
What I need to do is combine all salaries and find the MAX and MIN from these columns ---
Select
Greatest(Salary_1, Salary_2, Salary_3, Salary_4, Salary_5, Salary_6) as MaxSal,
Least(COALESCE(Salary_1, Salary_2, Salary_3, Salary_4, Salary_5, Salary_6),0) as MinSal
from
(select
sal1 as Salary_1, Select sal2 as Salary_2, Sal3 as Salary_3, sal4 as Salary_4, Sal5 as Salary_5, Sal6 as Salary_6
from ....)a
The problem is, this is returning the correct value for Max Sal but 0.00 for Min, because it is the minimum value but won't let me ignore 0s, but in this case 0 is not a minimum salary value I want, I need the second lowest value here.
I've tried setting the original Sal1-Sal6 values to NULLIF 0 and it returns NULL for max and 0 for Min.
What else could I have a look at? the COALESCE combined with NULLIF has not worked for me which is what has been recommended on previous questions. Thanks!
Greatest and Least do not ignore nulls like aggregation functions do; you'll need to do something to avoid them. One option is something like this:
Greatest(IFNULL(Salary_1 ,0), ...)
Least(
CASE WHEN Salary_1 IS NULL OR Salary_1 = 0 THEN /*some huge value*/ ELSE Salary_1 END
, CASE WHEN Salary_2
....)
This might be simplest to unpivot and aggregate the data:
select id, max(salary), min(salary)
from ((select id, salary_1 as salary from t) union all
(select id, salary_2 as salary from t) union all
. . .
) t
group by id;
This is definitely more expensive than a giant case expression. On the other hand, it is less prone to error.
The real suggestion is to fix your data model. Trying to store an array in multiple columns is generally a sign of a poor data model. The more appropriate method would have one row per salary rather than putting them in separate columns.
Related
I have a table with a column called "Points", the value of this column have a min value of 0, and a max value of 100.000. I have to do an analysis per range of this column, so I wrote a query like this:
select case when Points between 0 and 5000 then '0 - 5000'
when Points between 5001 and 20000 then '50001 - 20000'
when Points > 20000 then '> 20000'
else 0 end RangeP
from Sales
The problem is that the customer wants to see for each 2.000 points from 0 to 100.000
If I wrote the query using the case, the query will get really big, so I'd like one way to get dynamically this range.
It is possible? Thank you very much
You may create a table which contains the ranges, and their text labels, and then join to it, e.g.
SELECT
s.Points,
COALESCE(r.label, 'range not found') AS range
FROM Sales s
LEFT JOIN
(
SELECT 0 AS start, 2000 AS end, '0 - 2000' AS label UNION ALL
SELECT 2001, 4000, '2001 - 4000' UNION ALL
...
SELECT 98000, 100000, '98000 - 100000'
) r
ON s.Points BETWEEN r.start AND r.end;
I have inlined the table of ranges, but you may create a formal table (or maybe a temp table) instead, and then replace the above subquery with just a reference to that table.
I'm selecting some data;
select c.*,
coalesce(s.column1, ...),
coalesce(s.column2, ...),
FROM
(SELECT ...)
Basically, if s.column1 or s.column2 is null then I am putting in some logic to take the average of that column and use it instead.
I want to have another field so I can know weather or not that value was computing using the average or not - perhaps a boolean? Lets say the average for column1 was 120, the table would look like;
column1 column2 avg
54 10 0
200 40 0
120 180 1
499 160 0
This allows me to see that the third row was generated using the avg of all rows as it was initially null.
How could the logic for the avg column work?
Your question seems fairly moot to me because:
The AVG function ignores NULL values by default, so the average using the overall average for NULL slots is the same as leaving out those slots entirely, and
If you just want to mark the rows which had a NULL value, you can use a CASE expression
So, to get what you want, just use this:
SELECT
column1,
column2,
CASE WHEN column1 IS NULL THEN 1 ELSE 0 END AS avg
FROM yourTable;
And know that SELECT AVG(column1) FROM yourTable would return the same value whether NULL rows were omitted, or the overall average were used.
I am stuck with the following issue. I have 1 table that looks like this:
field_number.. Value
````````````````````````````````
1 ......................... 1
2 ..........................1
3 ......................... 2
4 ..........................2
etc.
I want to group different fieldnumbers and have an average for the value column. So the output should be:
field_number................Value
name(1,2)...................... 1.............. ((1+1)/2)
name(3,4)...................... 2.............. ((2+2)/2)
I have checked previous questions but cannot find any question that covers this issue (I might search on the wrong keywords though). So if this has already been covered my appologies, but any help or a point to a previous answer would be appreciated.
** =============UPDATE============= **
I went through your suggestions but did not get it right. So I am trying to be more specific. I almost have the result I want apart from the fact I want to have a fixed value in one of my columns. I have the following query:
Select
Avg(wp_rg_lead_detail.value),
wp_rg_lead_detail.field_number,
From
wp_rg_lead_detail
Where
wp_rg_lead_detail.field_number In (15, 17, 24) A
UNION
Select
Avg(wp_rg_lead_detail.value),
wp_rg_lead_detail.field_number,
From
wp_rg_lead_detail
Where
wp_rg_lead_detail.field_number In (16, 108, 18)
etc.
This gives me a table with two columns
wp_rg_lead_detail.value................field_number
4.3 (average)..............................15 (first value of av calculation)
What I want is to change the field number (15 in this case) in a fixed value (text). What and how should I add this to the query?
SELECT avg(value) FROM table WHERE field_number in (1,2)
SELECT avg(value) FROM table WHERE field_number in (3,4)
If your table is really this simple, you can also get away with:
select distinct
Value,
count(Value) as '#'
from table_name
group by Value
If you acctually want to group by a range, than you can put the logic of the range in your grouping clause (see this fiddle)
select distinct
avg(Value) as average,
floor(Value),
count(Value) as '#'
from table_name
group by floor(Value)
In the fiddle I used grouping on whole integers, but you can make that as complex as you like (see, for instance, this example)
If you are actually also interested in your corresponding fields, use group_concat() like so
select
Value,
group_concat(
distinct field_number
order by Value
) as fields
from table_name tn1
group by Value
order by Value
output:
Value | fields
---------------------------------
1 | 1,2
2 | 3,4
See this fiddle implemented from this blog post
For a generalized answer.
SELECT CONCAT('name','(',GROUP_CONCAT(field_number),')') AS field_number,
AVG(Value) as Value
FROM table_name
group by table_name.`Value`
Hope this helps.
I have for example a query with return something as it
route value
1 3
2 2
3 4
4 5
5 1
then I need to put in 2 textbox the max and the min route so in sql this would be
select top 1 route from table where value=(select max(value) from table)
I add a image done in excel, how this would be.
I believe this is so easy but I dont have idea how to get it.
I got using expression, this was extactly expression
="Route "+
Convert.ToString (
Lookup(max(fields!value.Value),fields!value.Value ,fields!route.Value,"mydataset")
)
changing max for min, for the other...
thanks everyone.
I believe the query you're looking for would be:
With Min_Max_CTE as (
Select MIN(value) as Min_Value
, MAX(value) as Max_Value
From Table
)
Select Top 1 'Min' as Type
, T.route
, T.value
From Table T
Inner Join Min_Max_CTE CTE
on T.value = CTE.Min_Value
Union All
Select Top 1 'Max' as Type
, T.route
, T.value
From Table T
Inner Join Min_Max_CTE CTE
on T.value = CTE.Max_Value
Order by Type desc --This will put the Min Route first followed by the Max Route
Then, put that query into a dataset, and then create a tablix and use the Type, route, and value fields to return the minimum route and the maximum route. It should end up being set up just like your excel section with the min and max routes above.
You can do this SSRS by using a couple of separate tables. Your example data:
And two tables in the Designer:
Since the tables only have header rows, only the first row in the table will be displayed.
To make sure we get the MAX and MIN values in the two tables, each table needs to order its Dataset appropriately, i.e. by Value by descending and ascending respectively.
MAX table:
MIN table:
Which gives your expected result:
Brain is not working today and my google skills are failing me.
I have a column of numbers ranging from 1 - 1000. I want to dump the min and max values for 100 (or whatever I chose) record ranges into a temp table. The plan is to use this temp table to process ranges of records (in this example 100 at a time) in a larger table.
Swear I have done this before with a CTE but then I had something to group on. Here I just want to break up a single list of numbers into ranges of X.
The output from the temp table should look like:
Min Max
0 99
100 199
200 299
300 399
etc.
Thanks!
You can use this trick from Stuart Ainsworth:
http://codegumbo.com/index.php/2009/01/25/building-ranges-using-a-dynamically-generated-numbers-table/
Numbers tables are awesome, but he uses a dynamically generated numbers table, which is even awesome...r.
If you know all numbers are present in the source table, you can use a recursive CTE to generate the number ranges:
; with numbers as
(
select 0 as a
, 99 as b
union all
select a+100
, b+100
from numbers
where a < 900
)
select *
from numbers
If the source table is sparsely populated, you can limit it to numbers that are actually present like:
... insert CTE from above here ...
select min(ot.NumberColumn)
, max(ot.NumberColumn)
from numbers
left join
OtherTable ot
on ot.NumberColumn between numbers.a and numbers.b
group by
numbers.a
enter code hereI have been having a play with a CTE after you posted this and came up with the following, I would be interested to hear if it works for you at all.
DECLARE #segment int = 100
;
WITH _CTE
(rowNum, value)
AS
(
SELECT ROW_NUMBER() OVER(ORDER BY col01) -1, col01
FROM dbo.testTable
)
SELECT rowNum/#segment AS Bucket, MIN(Value) AS MinVal, MAX(Value) AS MaxVal
FROM _CTE
group by rowNum/#segment
ORDER BY Bucket
;
col01 in this case is the column that you want the min/max range values from, as is TestTable.