I've looked at some answers but none of them seem to be applicable to me.
Basically I have this result set:
RowNo | Id | OrderNo |
1 101 1
2 101 10
I just want to convert this to
| Id | OrderNo_0 | OrderNo_1 |
101 1 10
I know I should probably use PIVOT. But the syntax is just not clear to me.
The order numbers are always two. To make things clearer
And if you want to use PIVOT then the following works with the data provided:
declare #Orders table (RowNo int, Id int, OrderNo int)
insert into #Orders (RowNo, Id, OrderNo)
select 1, 101, 1 union all select 2, 101, 10
select Id, [1] OrderNo_0, [2] OrderNo_1
from (
select RowNo, Id, OrderNo
from #Orders
) SourceTable
pivot (
sum(OrderNo)
for RowNo in ([1],[2])
) as PivotTable
Reference: https://learn.microsoft.com/en-us/sql/t-sql/queries/from-using-pivot-and-unpivot?view=sql-server-2017
Note: To build each row in the result set the pivot function is grouping by the columns not begin pivoted. Therefore you need an aggregate function on the column that is being pivoted. You won't notice it in this instance because you have unique rows to start with - but if you had multiple rows with the RowNo and Id you would then find the aggregation comes into play.
As you say there are only ever two order numbers per ID, you could join the results set to itself on the ID column. For the purposes of the example below, I'm assuming your results set is merely selecting from a single Orders table, but it should be easy enough to replace this with your existing query.
SELECT o1.ID, o1.OrderNo AS [OrderNo_0], o2.OrderNo AS [OrderNo_1]
FROM Orders AS o1
INNER JOIN Orders AS o2
ON (o1.ID = o2.ID AND o1.OrderNo <> o2.OrderNo)
From your sample data, simplest you can try to use min and MAX function.
SELECT Id,min(OrderNo) OrderNo_0,MAX(OrderNo) OrderNo_1
FROM T
GROUP BY Id
Related
I'm trying to come up with a useful way to list all pages in between the first of last page of a document into new rows while maintaining the ID number as a key, or cross reference. I have a few ways of getting pages in between, but I'm not exactly sure how to maintain the key in a programmatic way.
Example Input:
First Page Last Page ID
ABC_001 ABC_004 1
ABC_005 ABC_005 2
ABC_006 ABC_010 3
End Result:
All Pages ID
ABC_001 1
ABC_002 1
ABC_003 1
ABC_004 1
ABC_005 2
ABC_006 3
ABC_007 3
ABC_008 3
ABC_009 3
ABC_010 3
Any help is much appreciated. I'm using SQL mgmt studio.
One approach would be to set up a numbers table, that contains a list of numbers that you may possibly find in the column content:
CREATE TABLE numbers( idx INTEGER);
INSERT INTO numbers VALUES(1);
INSERT INTO numbers VALUES(2);
...
INSERT INTO numbers VALUES(10);
Now, assuming that all page values have 7 characters, with the last 3 being digits, we can JOIN the original table with the numbers table to generate the missing records:
SELECT
CONCAT(
SUBSTRING(t.First_Page, 1, 4),
REPLICATE('0', 3 - LEN(n.idx)),
n.idx
) AS [ALl Pages],
t.id
FROM
mytable t
INNER JOIN numbers n
ON n.idx >= CAST(SUBSTRING(t.First_Page, 5, 3) AS int)
AND n.idx <= CAST(SUBSTRING(t.Last_Page, 5, 3) AS int)
This demo on DB Fiddle with your sample data returns:
ALl Pages | id
:-------- | -:
ABC_001 | 1
ABC_002 | 1
ABC_003 | 1
ABC_004 | 1
ABC_005 | 2
ABC_006 | 3
ABC_007 | 3
ABC_008 | 3
ABC_009 | 3
ABC_010 | 3
To find all pages from First Page to Last Page per Book ID, CAST your page numbers from STRING to INTEGER, then add +1 to each page number until you reach the Last Page.
First, turn your original table into a table variable with the Integer data types using a TRY_CAST.
DECLARE #Book TABLE (
[ID] INT
,[FirstPage] INT
,[LastPage] INT
)
INSERT INTO #Book
SELECT [ID]
,TRY_CAST(RIGHT([FirstPage], 3) AS int) AS [FirstPage]
,TRY_CAST(RIGHT([LastPage], 3) AS int) AS [LastPage]
FROM [YourOriginalTable]
Set the maximum page that your pages will increment to using a variable. This will cap out your results to the correct number of pages. Otherwise your table would have many more rows than you need.
DECLARE #LastPage INT
SELECT #LastPage = MAX([LastPage]) FROM #Book
Turning a three-column table (ID, First Page, Last Page) into a two-column table (ID, Page) will require an UNPIVOT.
We're tucking that UNPIVOT into a CTE (Common Table Expression: basically a smart version of a temporary table (like a #TempTable or #TableVariable, but which you can only use once, and is a little more efficient in certain circumstances).
In addition to the UNPIVOT of your [First Name] and [Last Name] columns into a tall table, we're going to append every other combination of page number per ID using a UNION ALL.
;WITH BookCTE AS (
SELECT [ID]
,[Page]
FROM (SELECT [ID]
,[FirstPage]
,[LastPage]
FROM #Book) AS bp
UNPIVOT
(
[Page] FOR [Pages] IN ([FirstPage], [LastPage])
) AS up
UNION ALL
SELECT [ID], [Page] + 1 FROM BookCTE WHERE [Page] + 1 < #LastPage
)
Now that your data is held in a table format using a CTE with all combinations of [ID] and [Page] up to the maximum page in your #Book table, it's time to join your CTE with the #Book table.
SELECT DISTINCT
cte.ID
,cte.Page
FROM BookCTE AS cte
INNER JOIN #Book AS bk
ON bk.ID = cte.ID
WHERE cte.Page <= bk.[LastPage]
ORDER BY
cte.ID
,cte.Page
OPTION (MAXRECURSION 10000)
See also:
How to generate a range of numbers between two numbers (I based my code off of #Jayvee's answer)
Assigning variables using SET vs SELECT
SQL Server UNPIVOT
SQL Server CTE Basics
Recursive CTEs Explained
Note: will update with re-integrating string portion of FirstPage and LastPage (which I assume is based on book title). Stand by.
I have the following table
I need to get the following output as "SVGFRAMXPOSLSVG" from the 2 columns.
Is it possible to get this appended values from 2 columns
Please try this.
SELECT STUFF((
SELECT '' + DEPART_AIRPORT_CODE + ARRIVE_AIRPORT_CODE
FROM #tblName
FOR XML PATH('')
), 1, 0, '')
For Example:-
Declare #tbl Table(
id INT ,
DEPART_AIRPORT_CODE Varchar(50),
ARRIVE_AIRPORT_CODE Varchar(50),
value varchar(50)
)
INSERT INTO #tbl VALUES(1,'g1','g2',NULL)
INSERT INTO #tbl VALUES(2,'g2','g3',NULL)
INSERT INTO #tbl VALUES(3,'g3','g1',NULL)
SELECT STUFF((
SELECT '' + DEPART_AIRPORT_CODE + ARRIVE_AIRPORT_CODE
FROM #tbl
FOR XML PATH('')
), 1, 0, '')
Summary
Use Analytic functions and listagg to get the job done.
Detail
Create two lists of code_id and code values. Match the code_id values for the same airport codes (passengers depart from the same airport they just arrived at). Using lag and lead to grab values from other rows. NULLs will exist for code_id at the start and end of the itinerary. Default the first NULL to 0, and the last NULL to be the previous code_id plus 1. A list of codes will be produced, with a matching index. Merge the lists together and remove duplicates by using a union. Finally use listagg with no delimiter to aggregate the rows onto a string value.
with codes as
(
select
nvl(lag(t1.id) over (order by t1.id),0) as code_id,
t1.depart_airport_code as code
from table1 t1
union
select
nvl(lead(t1.id) over (order by t1.id)-1,lag(t1.id) over (order by t1.id)+1) as code_id,
t1.arrive_airport_code as code
from table1 t1
)
select
listagg(c.code,'') WITHIN GROUP (ORDER BY c.code_id) as result
from codes c;
Note: This solution does rely on an integer id field being available. Otherwise the analytic functions wouldn't have a column to sort by. If id doesn't exist, then you would need to manufacture one based on another column, such as a timestamp or another identifier that ensures the rows are in the correct order.
Use row_number() over (order by myorderedidentifier) as id in a subquery or view to achieve this. Don't use rownum. It could give you unpredictable results. Without an ORDER BY clause, there is no guarantee that the same query will return the same results each time.
Output
| RESULT |
|-----------------|
| SVGFRAMXPOSLSVG |
Am working with PostgreSQL 8.0.2, I have table
create table rate_date (id serial, rate_name text);
and it's data is
id rate_name
--------------
1 startRate
2 MidRate
3 xlRate
4 xxlRate
After select it will show data with default order or order by applied to any column of same table. My requirement is I have separate entity from where I will get data as (xlRate, MidRate,startRate,xxlRate) so I want to use this data to sort the select on table rate_data. I have tried for values join but it's not working and no other solution am able to think will work. If any one have idea please share detail.
Output should be
xlRate
MidRate
startRate
xxlRate
my attempt/thinking.
select id, rate_name
from rate_date r
join (
VALUES (1, 'xlRate'),(2, 'MidRate')
) as x(a,b) on x.b = c.rate_name
I am not sure if this is helpful but in Oracle you could achieve that this way:
select *
from
(
select id, rate_name,
case rate_name
when 'xlRate' then 1
when 'MidRate' then 2
when 'startRate' then 3
when 'xxlRate' then 4
else 100
end my_order
from rate_date r
)
order by my_order
May be you can do something like this in PostgreSQL?
I want to show the number of times each distinct element in a column in a table in a SQL database appears, alongside the particular distinct element in a new output table. Is it possible in a single statement over ramming my head over it manually?
Without having actually tried, how about this:
SELECT tmp.Field, (SELECT COUNT(*) FROM [Table] t WHERE t.DesiredField = tmp.Field) AS Count
FROM
(
SELECT DISTINCT DesiredField FROM [Table]
) tmp
This would first select all distinct values from [Table] and in the outer select, take the values and the number of times they appear in the column.
You could also try
SELECT Field, SUM(1) AS Count FROM Table
GROUP BY Field
This should "flatten" the table so that it only contains distinct values in Field and the number of rows where Field has the same value.
I just tried the second - it seems to work nicely.
Turns out I was wrong all the time. The second example and the following actually return the same results:
SELECT Field, COUNT(*) AS Count FROM Table
GROUP BY Field
Simplest just to use COUNT(). You'll see varieties on what your count parameter, so here are the options.
DECLARE #tbl TABLE(id INT, data INT)
INSERT INTO #tbl VALUES (1,1),(2,1),(3,2),(4,NULL)
SELECT data
,COUNT(*) Count_star
,COUNT(id) Count_id
,COUNT(data) Count_data
,COUNT(1) Count_literal
FROM #tbl
GROUP BY data
data Count_star Count_id Count_data Count_literal
----------- ----------- ----------- ----------- -------------
NULL 1 1 0 1
1 2 2 2 2
2 1 1 1 1
Warning: Null value is eliminated by an aggregate or other SET operation.
You'll see the difference coming with the treatment of NULL if you COUNT a field that contains NULLs.
i need Add Row Numbers To a SELECT Query without using Row_Number() function.
and without using user defined functions or stored procedures.
Select (obtain the row number) as [Row], field1, field2, fieldn from aTable
UPDATE
i am using SAP B1 DIAPI, to make a query , this system does not allow the use of rownumber() function in the select statement.
Bye.
I'm not sure if this will work for your particular situation or not, but can you execute this query with a stored procedure? If so, you can:
A) Create a temp table with all your normal result columns, plus a Row column as an auto-incremented identity.
B) Select-Insert your original query, sans the row column (SQL will fill this in automatically for you)
C) Select * on the temp table for your result set.
Not the most elegant solution, but will accomplish the row numbering you are wanting.
This query will give you the row_number,
SELECT
(SELECT COUNT(*) FROM #table t2 WHERE t2.field <= t1.field) AS row_number,
field,
otherField
FROM #table t1
but there are some restrictions when you want to use it. You have to have one column in your table (in the example it is field) which is unique and numeric and you can use it as a reference. For example:
DECLARE #table TABLE
(
field INT,
otherField VARCHAR(10)
)
INSERT INTO #table(field,otherField) VALUES (1,'a')
INSERT INTO #table(field,otherField) VALUES (4,'b')
INSERT INTO #table(field,otherField) VALUES (6,'c')
INSERT INTO #table(field,otherField) VALUES (7,'d')
SELECT * FROM #table
returns
field | otherField
------------------
1 | a
4 | b
6 | c
7 | d
and
SELECT
(SELECT COUNT(*) FROM #table t2 WHERE t2.field <= t1.field) AS row_number,
field,
otherField
FROM #table t1
returns
row_number | field | otherField
-------------------------------
1 | 1 | a
2 | 4 | b
3 | 6 | c
4 | 7 | d
This is the solution without functions and stored procedures, but as I said there are the restrictions. But anyway, maybe it is enough for you.
RRUZ, you might be able to hide the use of a function by wrapping your query in a View. It would be transparent to the caller. I don't see any other options, besides the ones already mentioned.