Select non-existing rows - sql

Question

Let say I have a table:
ColumnA ColumnB
---------------------------------
1 10.75
4 1234.30
6 2000.99
How can I write a SELECT query that will result in the following:
ColumnA ColumnB
---------------------------------
1 10.75
2 0.00
3 0.00
4 1234.30
5 0.00
6 2000.99

Answer 1

You can use a CTE to create a list of numbers from 1 to the maximum value in your table:
; with numbers as
(
select max(ColumnA) as nr
from YourTable
union all
select nr - 1
from numbers
where nr > 1
)
select nr.nr as ColumnA
, yt.ColumnB
from numbers nr
left join
YourTable yt
on nr.nr = yt.ColumnA
order by
nr.nr
option (maxrecursion 0)
See it working at SQL Fiddle.

Answer 2

Please try:
declare #min int, #max int
select #min=MIN(ColumnA), #max=MAX(ColumnA) from tbl
select
distinct number ColumnA,
isnull(b.ColumnB, 0) ColumnB
from
master.dbo.spt_values a left join tbl b on a.number=b.ColumnA
where number between #min and #max

Answer 3

Create a TallyTable (or NumbersTable) - see this question: What is the best way to create and populate a numbers table?
With that table create an insert statement:
INSERT INTO YourTable (ColumnA, ColumnB)
SELECT Number FROM NumberTable
WHERE
NOT EXISTS (SELECT 1 FROM YourTable WHERE NumberTable.Number = YourTable.ColumnA)
-- Adjust this value or calculate it with a query to the maximum of the source table
AND NumberTable.Number < 230130

Answer 4

DECLARE #t TABLE (ID INT,Val DECIMAL(10,2))
INSERT INTO #t (ID,Val) VALUES (1,10.75)
INSERT INTO #t (ID,Val) VALUES (4,6.75)
INSERT INTO #t (ID,Val) VALUES (7,4.75)
declare #MinNo int
declare #MaxNo int
declare #IncrementStep int
set #MinNo = 1
set #MaxNo = 10
set #IncrementStep = 1
;with C as
(
select #MinNo as Num
union all
select Num + #IncrementStep
from C
where Num < #MaxNo
)
select Num,
CASE WHEN Val IS NOT NULL THEN Val ELSE 0.00 END AS NUMBER
from C
LEFT JOIN #t t
ON t.ID = c.Num

Answer 5

You could use a number-table or following trick to generate a sequence which you can LEFT OUTER JOIN with your table. I assume you want to determine the boundaries dynamically:
WITH Seq AS
(
SELECT TOP ((SELECT Max(ColumnA)FROM Table1) - (SELECT Min(ColumnA) FROM Table1) + 1)
Num = (SELECT Min(ColumnA) FROM Table1)+ Row_number() OVER (ORDER BY [object_id]) -1
FROM sys.all_objects)
SELECT ColumnA = Seq.Num,
ColumnB = COALESCE(t.ColumnB ,0.00)
FROM Seq
LEFT OUTER JOIN Table1 t
ON Seq.Num = t.ColumnA
Demo with your sample.
Worth reading: http://www.sqlperformance.com/2013/01/t-sql-queries/generate-a-set-1

Answer 6

I have my collect of table functions like these.
create function dbo.GetNumbers(#Start int, #End int)
returns #Items table
(
Item int
)
as
begin
while (#Start <= #End)
begin
insert into #Items
values (#Start)
set #Start = #Start + 1
end
return
end
Then I can use it to left join to my data table and every value will be there.
declare #min int, #max int
set #min = 10
set #max = 20
select gn.Item
from dbo.GetNumbers(#min, #max) gn
I have similar table functions for date ranges, times, timezones, etc.