I have a table with following structure
ID FirstName LastName CollectedNumbers
1 A B 10,11,15,55
2 C D 101,132,111
I want a boolean value based on CollectedNumber Range. e.g. If CollectedNumbers are between 1 and 100 then True if Over 100 then False. Can anyone Suggest what would be best way to accomplish this. Collected Numbers won't be sorted always.
It so happens that you have a pretty simple way to see if values are 100 or over in the list. If such a value exists, then there are at least three characters between the commas. If the numbers are never more than 999, you could do:
select (case when ','+CollectedNumbers+',' not like '%,[0-9][0-9][0-9]%' then 1
else 0
end) as booleanflag
This happens to work for the break point of 100. It is obviously not a general solution. The best solution would be to use a junction table with one row per id and CollectedNumber.
Just make a function, which will return true/False, in the database which will convert the string values(10,11,15,55) into a table and call that function in the Selection of the Query like this
Select
ID, FirstName, LastName,
dbo.fncCollectedNumbersResult(stringvalue) as Result
from yourTableName
I think the easiest you can do is build a C# function and use the builtin sqlclr to load it as a custom function you can then call.
Inside the C# function, you can then sort your numbers and make simple logic to return your true/false.
Related
Can I select a column based on another column's value being listed as a formula? So I have a table, something like:
column_name formula val
one NULL 1
two NULL 2
three one + two NULL
And I want to do
SELECT
column_name,
CASE WHEN formula IS NULL
val
ELSE
(Here's where I'm confused - How do I evaluate the formula?)
END as result
FROM
table
And end up with a result set like
column_name result
one 1
two 2
three 3
You keep saying column, and column name, but you're actually talking about rows, not columns.
The problem is that you (potentially) want different formulas for each row. For example, row 4 might be (two - one) = 1 or even (three + one) = 4, where you'd have to calculate row three before you could do row 4. This means that a simple select query that parses the formulas is going to be very hard to do, and it would have to be able to handle each type of formula, and even then if the formulas reference other formulas that only makes it harder.
If you have to be able to handle functions like (two + one) * five = 15 and two + one * five = 7, then you'd be basically re-implementing a full blown eval function. You might be better to return the SQL table to another language that has eval functions built in, or you could use something like SQL Eval.net if it has to be in SQL.
Either way, though, you've still got to change "two + one" to "2 + 1" before you can do the eval with it. Because these values are in other rows, you can't see those values in the row you're looking at. To get the value for "one" you have to do something like
Select val from table where column_name = 'one'
And even then if the val is null, that means it hasn't been calculated yet, and you have to come back and try again later.
If I had to do something like this, I would create a temporary table, and load the basic table into it. Then, I'd iterate over the rows with null values, trying to replace column names with the literal values. I'd run the eval over any formulas that had no symbols anymore, setting the val for those rows. If there were still rows with no val (ie they were waiting for another row to be done first), I'd go back and iterate again. At the end, you should have a val for every row, at which point it is a simple query to get your results.
Possible solution would be like this kind....but since you mentioned very few things so this works on your above condition, not sure for anything else.
GO
SELECT
t1.column_name,
CASE WHEN t1.formula IS NULL
t1.val
ELSE
(select sum(t2.val) from table as t2 where t2.formula is not null)
END as result
FROM
table as t1
GO
If this is not working feel free to discuss it further.
Table has text labels for category identification
The spelling has changed over time
I want to normalise the text labels when I count the records in each category
So for example I have The category labels:
'Ready to go' and 'Readytogo'
But I also have another text value abc that I want to replace with Abcd
The rest Inwant to keep in my Groupby and Count
How can I count these in the new group names in Teradata?
At the moment I'm using case statements for the ones I'm okay with, then using OREPLACE to switch one of the values but how do I nest it so that I can OREPLACE 2 or more values with 2 or more new ones? Is OREPLACE the best function to use here?
Thanks
Apologies I have managed to solve it using multiple WHEN, THEN clauses as part of 1 case statement
This changes the text value ax to bn along with Fx to BM for example, as required
The OREPLACE function was not recognised in the release of Teradata that I am using
I will specify question better next time
Thanks
I am trying to run a query that calculate with a countif function but I am having trouble with it. I have used the count and the iif functions in the builder but I think something weird is going on. I am trying to count the number of times a certain value occurs in a column so I do not want a specific value to equal to if that's possible?
Thanks!
To count the number of times a value appears you can use something like.
If you want to know how many times each value appears just omit the WHERE clause (without a sample of data I've used a table in the database I'm working on).
SELECT ProcessID,
COUNT(ProcessID)
FROM tbl_PrimaryData_Step1
WHERE ProcessID = 4
GROUP BY ProcessID
if you need just the value you can use:
SELECT COUNT(ProcessID)
FROM tbl_PrimaryData_Step1
WHERE ProcessID = 4
GROUP BY ProcessID
Another way is:
SELECT DCOUNT("ProcessID","tbl_PrimaryData_Step1","ProcessID = 4")
Edit:
In reply to your comment on your original post this SQL will give the result you're after:
SELECT Concatenate,
COUNT(Concatenate)
FROM MyTable
GROUP BY Concatenate
I'm working with a database, where one of the fields I extract is something like:
1-117 3-134 3-133
Each of these number sets represents a different set of data in another table. Taking 1-117 as an example, 1 = equipment ID, and 117 = equipment settings.
I have another table from which I need to extract data based on the previous field. It has two columns that split equipment ID and settings. Essentially, I need a way to go from the queried column 1-117 and run a query to extract data from another table where 1 and 117 are two separate corresponding columns.
So, is there anyway to split this number to run this query?
Also, how would I split those three numbers (1-117 3-134 3-133) into three different query sets?
The tricky part here is that this column can have any number of sets here (such as 1-117 3-133 or 1-117 3-134 3-133 2-131).
I'm creating these queries in a stored procedure as part of a larger document to display the extracted data.
Thanks for any help.
Since you didn't provide the DB vendor, here's two posts that answer this question for SQL Server and Oracle respectively...
T-SQL: Opposite to string concatenation - how to split string into multiple records
Splitting comma separated string in a PL/SQL stored proc
And if you're using some other DBMS, go search for "splitting text ". I can almost guarantee you're not the first one to ask, and there's answers for every DBMS flavor out there.
As you said the format is constant though, you could also do something simpler using a SUBSTRING function.
EDIT in response to OP comment...
Since you're using SQL Server, and you said that these values are always in a consistent format, you can do something as simple as using SUBSTRING to get each part of the value and assign them to T-SQL variables, where you can then use them to do whatever you want, like using them in the predicate of a query.
Assuming that what you said is true about the format always being #-### (exactly 1 digit, a dash, and 3 digits) this is fairly easy.
WITH EquipmentSettings AS (
SELECT
S.*,
Convert(int, Substring(S.AwfulMultivalue, V.Value * 6 - 5, 1) EquipmentID,
Convert(int, Substring(S.AwfulMultivalue, V.Value * 6 - 3, 3) Settings
FROM
SourceTable S
INNER JOIN master.dbo.spt_values V
ON V.Value BETWEEN 1 AND Len(S.AwfulMultivalue) / 6
WHERE
V.type = 'P'
)
SELECT
E.Whatever,
D.Whatever
FROM
EquipmentSettings E
INNER JOIN DestinationTable D
ON E.EquipmentID = D.EquipmentID
AND E.Settings = D.Settings
In SQL Server 2005+ this query will support 1365 values in the string.
If the length of the digits can vary, then it's a little harder. Let me know.
Incase if the sets does not increase by more than 4 then you can use Parsename to retrieve the result
Declare #Num varchar(20)
Set #Num='1-117 3-134 3-133'
select parsename(replace (#Num,' ','.'),3)
Result :- 1-117
Now again use parsename on the same resultset
Select parsename(replace(parsename(replace (#Num,' ','.'),3),'-','.'),1)
Result :- 117
If the there are more than 4 values then use split functions
Use:
The user searches for a partial postcode such as 'RG20' which should then be displayed in a specific order. The query uses the MATCH AGAINST method in boolean mode where an example of the postcode in the database would be 'RG20 7TT' so it is able to find it.
At the same time it also matches against a list of other postcodes which are in it's radius (which is a separate query).
I can't seem to find a way to order by a partial match, e.g.:
ORDER BY FIELD(postcode, 'RG20', 'RG14', 'RG18','RG17','RG28','OX12','OX11')
DESC, city DESC
Because it's not specifically looking for RG20 7TT, I don't think it can make a partial match.
I have tried SUBSTR (postcode, -4) and looked into left and right, but I haven't had any success using 'by field' and could not find another route...
Sorry this is a bit long winded, but I'm in a bit of a bind.
A UK postcode splits into 2 parts, the last section always being 3 characters and within my database there is a space between the two if that helps at all.
Although there is a DESC after the postcodes, I do need them to display in THAT particular order (RG20, RG14 then RG18 etc..) I'm unsure if specifying descending will remove the ordering or not
Order By Case
When postcode Like 'RG20%' Then 1
When postcode Like 'RG14%' Then 2
When postcode Like 'RG18%' Then 3
When postcode Like 'RG17%' Then 4
When postcode Like 'RG28%' Then 5
When postcode Like 'OX12%' Then 6
When postcode Like 'OX11%' Then 7
Else 99
End Asc
, City Desc
You're on the right track, trimming the field down to its first four characters:
ORDER BY FIELD(LEFT(postcode, 4), 'RG20', 'RG14', ...),
-- or SUBSTRING(postcode FROM 1 FOR 4)
-- or SUBSTR(postcode, 1, 4)
Here you don't want DESC.
(If your result set contains postcodes whose prefixes do not appear in your FIELD() ordering list, you'll have a bit more work to do, since those records will otherwise appear before any explicitly ordered records you specify. Before 'RG20' in the example above.)
If you want a completely custom sorting scheme, then I only see one way to do it...
Create a table to hold the values upon which to sort, and include a "sequence" or "sort_order" field. You can then join to this table and sort by the sequence field.
One note on the sequence field. It makes sense to create it as an int as... well, sequences are often ints :)
If there is any possibility of changing the sort order, you may want to consider making it alpha numeric... It is a lot easier to insert "5A" between "5 and "6" than it is to insert a number into a sequence of integers.
Another method I use is utilising the charindex function:
order by charindex(substr(postcode,4,1),"RG20RG14RG18...",1)
I think that's the syntax anyway, I'm just doing this in SAS at the moment so I've had to adapt from memory!
But essentially the sooner you hit your desired part of the string, the higher the rank.
If you're trying to rank on a large variety of postcodes then a case statement gets pretty hefty.