Given the below table as a SQL Result:
I want to use the above generated table and produce a table which clubs the given information into:
I have multiple areaName and multiple functionNames and multiple users. Please let me know if this is possible and how?
I have tried couple of things but I am just drained out now and need a direction. Any help is appreciated.
Even if you can provide a pseudo code, I can try and make use of it. Start from the SQL result as a given table.
Use correlated sub-queries to achieve the desired result. I've provided an example below. Test it for the first summary column, and then add in your other summary columns if it does. Hopefully this makes sense, and helps. Alternatively you could use a CTE (common table expression) to achieve similar results.
SELECT a.areaName, a.functionName
, (SELECT count(DISTINCT b.UserKey)
from AREAS b
where a.areaName = b.areaName
and a.functionName = b.functionName
and b.[1-add] = 1) as UsersinAdd
-- Lather/rinse/repeat for other summary columns
FROM AREAS a
group by a.areaName, a.functionName
Your problem stems from the de-normalised structure of your table. Columns [1-add],...,[8-correction] should be values in a column, not columns. This leads to more complex queries, as you have discovered.
The unpivot command allows you to correct this mistake.
select areaname, functionname, rights, count(distinct userkey)
from
(
select * from yourtable
unpivot (permission for rights in ([1-add], [2-update/display],[4-update/display all] , [8-correction] )) u
) v
group by areaname, functionname, rights
Related
I'm trying to remove duplicates on a column in SQL, without including that column in the extract (since it contains personally identifiable data). I thought I might be able to do this with nested queries (as below), however this isn't working. I also thought it might be possible to remove duplicates in the WHERE statement, but couldn't find anything from googling. Any ideas? Thanks in advance.
SELECT [ETHNIC], [RELIGION]
FROM
(SELECT DISTINCT [ID], [ETHNIC], [RELIGION]
FROM MainData)
Using distinct like that will apply distinct to the row, so if there are two rows with the same ID but different ETHNIC and RELIGION the distinct won't remove them. To do that you could use group by in your query, but then you need to use an aggregation (e.g. max):
SELECT [ETHNIC], [RELIGION]
FROM
(SELECT [ID], MAX([ETHNIC]) AS ETHNIC, MAX([RELIGION]) AS RELIGION
FROM MainData
GROUP BY [ID])
If that's not what you're looking for, some SQL dialects require that you name your inner select, so you could try adding AS X to the end of your query.
I would like to query a DB2 table and get all the results of a query in addition to all of the rows returned by the select statement in a separate column.
E.g., if the table contains columns 'id' and 'user_id', assuming 100 rows, the result of the query would appear in this format: (id) | (user_id) | 100.
I do not wish to use a 'group by' clause in the query. (Just in case you are confused about what i am asking) Also, I could not find an example here: http://mysite.verizon.net/Graeme_Birchall/cookbook/DB2V97CK.PDF.
Also, if there is a more efficient way of getting both these results (values + count), I would welcome any ideas. My environment uses zend framework 1.x, which does not have an ODBC adapter for DB2. (See issue http://framework.zend.com/issues/browse/ZF-905.)
If I understand what you are asking for, then the answer should be
select t.*, g.tally
from mytable t,
(select count(*) as tally
from mytable
) as g;
If this is not what you want, then please give an actual example of desired output, supposing there are 3 to 5 records, so that we can see exactly what you want.
You would use window/analytic functions for this:
select t.*, count(*) over() as NumRows
from table t;
This will work for whatever kind of query you have.
Given a relation R with n columns. Use sql to returns the tuples having the maximum number of occurrences of the values. I have no idea how to do query horizontally?
SELECT MAX(t.*) FROM mytable t
or
SELECT DISTINCT a, b, c FROM mytable
or
SELECT DISTINCT * FROM mytable
it depends on which SQL implementation you are referring to, and generally more information about the query. but the above examples should get you started so you can google some terms.
I'm not sure what you mean by querying horizontally. Is it one relation with multiple key columns linking the two tables? Sounds like you might just need to group by those columns and order by count(*) descending...
I'm having some trouble figuring out any way to combine two SQL queries into a single one that expresses some greater idea.
For example, let's say that I have query A, and query B. Query A returns the total number of hours worked. Query B returns the total number of hours that were available for workers to work. Each one of these queries returns a single column with a single row.
What I really want, though, is essentially query A over query B. I want to know the percentage of capacity that was worked.
I know how to write query A and B independently, but my problem comes when I try to figure out how to use those prewritten queries to come up with a new SQL query that uses them together. I know that, on a higher level, like say in a report, I could just call both queries and then divide them, but I'd rather encompass it all into a single SQL query.
What I'm looking for is a general idea on how to combine these queries using SQL.
Thanks!
Unconstrained JOIN, Cartesian Product of 1 row by 1 row
SELECT worked/available AS PercentageCapacity
FROM ( SELECT worked FROM A ),
( SELECT available FROM B )
You can declare variables to store the results of each query and return the difference:
DECLARE #first INT
DECLARE #second INT
SET #first = SELECT val FROM Table...
SET #second = SELECT val FROM Table...
SELECT #first - #second
The answer depends on where the data is coming from.
If it's coming from a single table, it could be something as easy as:
select totalHours, availableHours, (totalHours - availableHours) as difference
from hoursTable
But if the data is coming from separate tables, you need to add some identifying column so that the rows can be joined together to provide some useful view of the data.
You may want to post examples of your queries so we know better how to answer your question.
You can query the queries:
SELECT
a.ID
a.HoursWorked/b.HoursAvailable AS UsedWork
FROM
( SELECT ID, HoursWorked FROM Somewhere ) a
INNER JOIN
( SELECT ID, HoursAvailable FROM SomewhereElse ) b
ON
a.ID = b.ID
For examples I don't know how many rows in each table are and I try to do like this:
SELECT * FROM members
UNION
SELECT * FROM inventory
What can I put to the second SELECT instead of * to remove this error without adding NULL's?
Put the columns names explicitly rather than *, and make sure the number of columns and data types match for the same column in each select.
Update:
I really don't think you want to be UNIONing those tables, based on the tables names. They don't seem to contain related data. If you post your schema and describe what you are trying to achieve it is likely we can provide better help.
you could do
SELECT *
from members
UNION
SELECT inventory.*, 'dummy1' AS membersCol1, 'dummy2' AS membersCol2
from inventory;
Where membersCol1, membersCol12, etc... are the names of columns from members that are not in inventory. That way both queries in the union will have the same columns (Assuming that all the columns in inventory are the same as in members which seems very strange to me... but hey, it's your schema).
UPDATE:
As HLGEM pointed out, this will only work if inventory has columns with the same names as members, and in the same order. Naming all the columns explicitly is the best idea, but since I don't know the names I can't exactly do that. If I did, it might look something like this:
SELECT id, name, member_role, member_type
from members
UNION
SELECT id, name, '(dummy for union)' AS member_role, '(dummy for union)' AS member_type
from inventory;
I don't like using NULL for dummy values because then it's not always clear which part of the union a record came from - using 'dummy' makes it clear that the record is from the part of the union that didn't have that record (though sometimes this might not matter). The very idea of unioning these two tables seems very strange to me because I very much doubt they'd have more than 1 or 2 columns with the same name, but you asked the question in such a way that I imagine in your scenario this somehow makes sense.
Are you sure you don't want a join instead? It is unlikely that UNOIN will give you what you want given the table names.
Try this
(SELECT * FROM members) ;
(SELECT * FROM inventory);
Just add semicolons after both the select statements and don't use union or anything else. This solved my error.
I don't know how many rows in each table
Are you sure this isn't what you want?
SELECT 'members' AS TableName, Count(*) AS Cnt FROM members
UNION ALL
SELECT 'inventory', Count(*) FROM inventory
Each SELECT statement within the MySQL UNION ALL operator must have the same number of fields in the result sets with similar data types
Visit https://www.techonthenet.com/mysql/union_all.php