I have a simple table of data that needs to be transposed from row data into column data. For example let me create a simple employee table:
I need to create a side-by-side comparison report structured like this using the above sql table:
Can someone show me the sql code using the sample table above? Or can it be done automatically using a built in ASP.net or DevExpress control?
Your feedback is always appreciated!
Thanks!
What you're looking for is a "pivot" function.
You can do them by hand inside of SQL, but it also looks like devexpress has a control for this...
http://www.devexpress.com/Products/NET/Controls/ASP/Pivot_Grid/
-- EDIT --
Like the commenter above posted, here's an introduction to the pivot function in SQL Server... What makes this tricky, is that unless you know exactly what values will comprise your columns, you'll have to use dynamic SQL to build the pivot.
Because it can be a little tricky to do in SQL, I'd try to stick to DevExpress since you already have it...
I think that if you were to add multiple data points to your pivot grid, that it would look like what you're expecting. Here's a screen shot from DevExpress that resembles what you're looking for...
Here's the page that shows this technique... In your case, instead of a row grouping, you could just do a "grand total", and then hide that column...
There it´s using SQL:
WITH FieldValueCte AS(
SELECT Name,
'Department' Field,
Department Value
FROM Table1 UNION ALL
SELECT Name,
'Sex' Field,
Sex Value
FROM Table1 UNION ALL
SELECT Name,
'HireDate' Field,
HireDate Value
FROM Table1 UNION ALL
SELECT Name,
'Salary' Field,
Salary Value
FROM Table1 UNION ALL
SELECT Name,
'Comments' Field,
Comments Value
FROM Table1)
SELECT [Field], [John Doe], [Jane Smith], [Peter Parker], [Jessica James]
FROM
(SELECT Field, Name, Value
FROM FieldValueCte) AS SourceTable
PIVOT
(
MIN(Value)
FOR Name IN ([John Doe], [Jane Smith], [Peter Parker], [Jessica James])
) AS PivotTable;
The solution is provided here
http://www.aspsnippets.com/Articles/Rotate-ASPNet-GridView---Convert-GridView-Columns-to-Rows-and-Rows-to-Columns.aspx
Related
I'm not sure I'm using right terminology here.
Basically I want to update entire "id" column using count(*) [485] as a delimiter, in an ascending order, so the resulting row value will correspond with rownumber (not the rowid).
If I understand you correctly, this should work for you:
UPDATE tbl_name SET id=rowid
EDIT
If that's is the case -> then it's a lit bit more tricky, since SQlite doesn't support variables declaration.
So what I suggest is,
To create temporary table from select of your original table which makes it's rowids to be as row numbers 1,2,3 etc...
Set it's rowNum (the needed row number column) as each rowid
Then replace the original table with it.
Like this: (assume original table called orig_name)
CREATE TABLE tmp_tbl AS SELECT rowNum FROM orig_name;
UPDATE tmp_tbl SET rowNum=rowid;
DROP TABLE orig_name;
CREATE TABLE orig_name AS SELECT rowNum FROM tmp_tbl;
DROP TABLE tmp_tbl;
Try this: http://www.sqlite.org/lang_createtable.html#rowid
You can use some inner database variables such as rowid, oid etc to get what you need.
[edit]
Think I just understood what you meant, you want for each insert action, add a value that is the total count of rows currently in the table?
If so, try something like this:
UPDATE tbl_name
SET id = (select count(*) from tbl_name)
WHERE yada_yada_yada
I'm working on a sqlite database and try to make a special request between two tables.
In the first table (table1 for example), i have two columns named "reference" and "ID". I want to search an ID in it, get it value in "reference" and display all informations from the table which have this value as name.
I try to find something on the internet but I didn't find an answer.
This is the request I made:
select * from (select Reference from table1 where Name='Value1')
It only give me the result of
select Reference from table1 where Name='Value1'
EDIT:
I want
select Reference from table1 where Name='Value1' => name of table
select * from name of table => show all elements
I'm new in sqlite but I hope you can help me.
Thank you by advance
Matt
If I understand your question correctly, I don't think there's a way to do it in sql completely (or at least not in a portable way). I'd recommend one of 3 solutions:
Do exactly what you want, but do some processing in Python. That means query your master table, then construct new query based on each of the rows returned.
If you have many tables, possibly changing dynamically - it may be a good idea to rethink your database design. Maybe you can move some of the changing table names into a new column and put your data in one table?
If you have only a few tables available as the Reference and they never change, you could join all the possible tables, like:
SELECT ... FROM table1
LEFT JOIN table2
ON table1.id = table2.id AND table1.Reference = "table2"
LEFT JOIN table3 ...
But you may need to explain it all a bit better...
How can i copy contents of my whole table in sql access and update one column to the same table.
So basically is selecting the whole table and updating one column and pasting that to the same table. thanks.
To clone an existing table back into the same table, but using a different value for one field, use something like the following (see notes that follow!):
INSERT INTO Table1 ( FldA, FldB, MyDate, StateCode )
SELECT Table1.FldA, Table1.FldB, Table1.MyDate, "FL" AS Expr1
FROM Table1;
You can't easily use the * to select/update all fields because your need to change one field would result in a "duplicate destination" error. If needed, you could use an 'IF' statement to change to different values (i.e. IF(FldA="VA","FL",IF(FldA="MD","TX",Flda))
Lets say i have Database with to tables (division_1,division_2)
each table have the same columns ( id, name , salary)
and Jone is person in one of these tables
is there a query in SQL that return in which division Jone is?
Use a union to select from both tables and see which contains the record
select 'division1' as div from division_1 where name = 'Jone'
union
select 'division2' as div from division_2 where name = 'Jone'
BTW if you have the possibility to change the DB design, then do it. There should only be one division table with a column that indicates which one it is.
Maybe i should do this in C# but i have more then one row with linkId X. I would like to remove it but i am unsure how. In code i could just use a foreach from 0 to n and remove any found rows with a greater (or !=) id but thats in code. Is there a less difficult way of doing it using sqlite?
Assuming the table's name is tableName and there is a primary key field named id, the following sql would do it. I think the following SQL query is general enough and should be able to be executed under any database engine.
delete from tableName
where id not in (
select min(id) from tableName
group by linkId
)