Aim to write a statement to produce a table with a numeric column that contains contra values, e.g.
Ref Value
a 100
b 75
c 50
c -50
b -75
a -100
I am new to SQL but aware it works row by row, so the only way I could think of doing this is write an initial SELECT statement into a temporary table and INSERT into my temporary table with the contra values, i.e.
SELECT
[Ref],
[Value]
INTO #Temp
FROM
mytable
INSERT INTO #Temp ([Ref], [Value])
SELECT
[Ref],
0 - [Value]
FROM
mytable
While this 'does the job' I fear it is 'messy' (could possibly cause problems when used for its intended purpose) and wondered if anyone would be able to provide a better solution.
Use Union ALL to combine the original and negative values. Then insert into temp table. Try this.
SELECT [Ref],
[Value]
INTO #Temp
FROM (SELECT [Ref],
[Value]
FROM mytable
UNION ALL
SELECT [Ref],
[Value] * -1
FROM mytable) a
If you just want to view the result remove the into #temp table
SELECT [Ref],
[Value]
FROM (SELECT [Ref],
[Value]
FROM mytable
UNION ALL
SELECT [Ref],
[Value] * -1
FROM mytable) a
Related
One of my table column stores ~650,000 characters (each value of the column contains entire table). I know its bad design however, Client will not be able to change it.
I am tasked to convert the column into multiple columns.
I chose to use dbo.DelimitedSplit8K function
Unfortunately, it can only handle 8k characters at max.
So I decided to split the column into 81 8k batches using while loop and store the same in a variable table (temp or normal table made no improvement)
DECLARE #tab1 table ( serialnumber int, etext nvarchar(1000))
declare #scriptquan int = (select MAX(len (errortext)/8000) from mytable)
DECLARE #Counter INT
DECLARE #A bigint = 1
DECLARE #B bigint = 8000
SET #Counter=1
WHILE ( #Counter <= #scriptquan + 1)
BEGIN
insert into #tab1 select ItemNumber, Item from dbo.mytable cross apply dbo.DelimitedSplit8K(substring(errortext, #A, #B), CHAR(13)+CHAR(10))
SET #A = #A + 8000
SET #B = #B + 8000
SET #Counter = #Counter + 1
END
This followed by using below code
declare #tab2 table (Item nvarchar(max),itemnumber int, Colseq varchar(10)) -- declare table variable
;with cte as (
select [etext] ,ItemNumber, Item from #tab1 -- insert table name
cross apply dbo.DelimitedSplit8K(etext,' ')) -- insert table columns name that contains text
insert into #tab2 Select Item,itemnumber, 'a'+ cast (ItemNumber as varchar) colseq
from cte -- insert values to table variable
;WITH Tbl(item, colseq) AS(
select item, colseq from #tab2
),
CteRn AS(
SELECT item, colseq,
Rn = ROW_NUMBER() OVER(PARTITION BY colseq ORDER BY colseq)
FROM Tbl
)
SELECT
a1 Time,a2 Number,a3 Type,a4 Remarks
FROM CteRn r
PIVOT(
MAX(item)
FOR colseq IN(a1,a2,a3,a4)
)p
where a3 = 'error'
gives the desired output. However, just the loop takes 15 minutes to complete and overall query completes by 27 minutes. Is there any way I can make it faster? Total row count in my table is 2. So I don't think Index can help.
Client uses Azure SQL Database so I can't choose PowerShell or Python to accomplish this either.
Please let me know if more information is needed. I tried my best to mention everything I could.
Tables have been created and used without and ID column, but ID column is now needed. (classic)
I heard everything could be done without cursors. I just need every row to contain a different int value so I was looking for some kind of row number function :
How do I use ROW_NUMBER()?
I can't tell exactly how to use it even with these exemples.
UPDATE [TableA]
SET [id] = (select ROW_NUMBER() over (order by id) from [TableA])
Subquery returned more than 1 value.
So... yes of course it return more than one value. Then how to mix both update and row number to get that column filled ?
PS. I don't need a precise order, just unique values. I also wonder if ROW_NUMBER() is appropriate in this situation...
You can use a CTE for the update
Example
Declare #TableA table (ID int,SomeCol varchar(50))
Insert Into #TableA values
(null,'Dog')
,(null,'Cat')
,(null,'Monkey')
;with cte as (
Select *
,RN = Row_Number() over(Order by (Select null))
From #TableA
)
Update cte set ID=RN
Select * from #TableA
Updated Table
ID SomeCol
1 Dog
2 Cat
3 Monkey
You can use a subquery too as
Declare #TableA table (ID int,SomeCol varchar(50))
Insert Into #TableA values
(null,'Dog')
,(null,'Cat')
,(null,'Monkey');
UPDATE T1
SET T1.ID = T2.RN
FROM #TableA T1 JOIN
(
SELECT ROW_NUMBER()OVER(ORDER BY (SELECT 1)) RN,
*
FROM #TableA
) T2
ON T1.SomeCol = T2.SomeCol;
Select * from #TableA
I have a table called accountNumbers. An example of values in the table are:
01-005-000-000-001-000
01-005-311-097-000
001-005-105-545
What I want to do is split the column (accountNum) at the dash, and then insert that value into a temp table, #test. When printing out #test, it should look like:
01
005
000
001
311
097
and so on. I cannot use store procedures or functions. I can get the first value, but any while loop I try just prints that first row over and over again.
WHILE ##ROWCOUNT > (select count(*) from dbo.accountNumbers
BEGIN
insert into #test (split, accountNum)
select SUBSTRING(accountNum, 1, CHARINDEX('-', accountNum) -1), accountNum
from dbo.accountNumbers
END
The restriction of no functions or procedures seems a little strange but you don't have to use a function to do this. A VERY minor tweak to the XML function found here http://sqlperformance.com/2012/07/t-sql-queries/split-strings can be utilized so you don't need a function to do this.
if OBJECT_ID('tempdb..#something') is not null
drop table #something
create table #something
(
AccountNumbers varchar(100)
)
insert #something
select '01-005-000-000-001-000' union all
select '01-005-311-097-000' union all
select '001-005-105-545'
select *
from #something s
cross apply
(
SELECT Item = y.i.value('(./text())[1]', 'nvarchar(4000)')
FROM
(
SELECT x = CONVERT(XML, '<i>'
+ REPLACE(s.AccountNumbers, '-', '</i><i>')
+ '</i>').query('.')
) AS a CROSS APPLY x.nodes('i') AS y(i)
)MySplit
I have a query that joins a master and a detail table. Master table records are duplicated in results as expected. I get aggregation on detail table an it works fine. But I also need another aggregation on master table at the same time. But as master table is duplicated, aggregation results are duplicated too.
I want to demonstrate this situation as below;
If Object_Id('tempdb..#data') Is Not Null Drop Table #data
Create Table #data (Id int, GroupId int, Value int)
If Object_Id('tempdb..#groups') Is Not Null Drop Table #groups
Create Table #groups (Id int, Value int)
/* insert groups */
Insert #groups (Id, Value)
Values (1,100), (2,200), (3, 200)
/* insert data */
Insert #data (Id, GroupId, Value)
Values (1,1,10),
(2,1,20),
(3,2,50),
(4,2,60),
(5,2,70),
(6,3,90)
My select query is
Select Sum(data.Value) As Data_Value,
Sum(groups.Value) As Group_Value
From #data data
Inner Join #groups groups On groups.Id = data.GroupId
The result is;
Data_Value Group_Value
300 1000
Expected result is;
Data_Value Group_Value
300 500
Please note that, derived table or sub-query is not an option. Also Sum(Distinct groups.Value) is not suitable for my case.
If I am not wrong, you just want to sum value column of both table and show it in a single row. in that case you don't need to join those just select the sum as a column like :
SELECT (SELECT SUM(VALUE) AS Data_Value FROM #DATA),
(SELECT SUM(VALUE) AS Group_Value FROM #groups)
SELECT
(
Select Sum(d.Value) From #data d
WHERE EXISTS (SELECT 1 FROM #groups WHERE Id = d.GroupId )
) AS Data_Value
,(
SELECT Sum( g.Value) FROM #groups g
WHERE EXISTS (SELECT 1 FROM #data WHERE GroupId = g.Id)
) AS Group_Value
I'm not sure what you are looking for. But it seems like you want the value from one group and the collected value that represents a group in the data table.
In that case I would suggest something like this.
select Sum(t.Data_Value) as Data_Value, Sum(t.Group_Value) as Group_Value
from
(select Sum(data.Value) As Data_Value, groups.Value As Group_Value
from data
inner join groups on groups.Id = data.GroupId
group by groups.Id, groups.Value)
as t
The edit should do the trick for you.
I have 2 temp Tables [Description] and [Institution], I want to have these two in one table.
They are both tables that look like this:
Table1; #T1
|Description|
blabla
blahblah
blagblag
Table2; #T2
|Institution|
Inst1
Inst2
Inst3
I want to get it like this:
Table3; #T3
|Description| |Institution|
blabla Inst1
blahblah Inst2
blagblag Inst3
They are already in sort order.
I just need to get them next to each other..
Last time I asked was something almost the same.
I used this query
Create Table #T3
(
[From] Datetime
,[To] Datetime
)
INSERT INTO #T3
SELECT #T1.[From]
, MIN(#T2.[To])
FROM #T1
JOIN #T2 ON #T1.[From] < #T2.[To]
GROUP BY #T1.[From]
Select * from #T3
It did work for the date values, but it won't work here ? :s
Thank you.
One thing that concerns me is that you say that the values "are already in sort order". There really is no default sort order -- if you don't specify a sort order, you are at the mercy of SQL Server to determine the order in which the data is returned. The solution below assumes that there is some way to sort the data such that the records "match up" (using the ORDER BY clauses).
Hope this helps,
John
-- Table 1 test data
Create Table #T1
(
[Description] nvarchar(30)
)
INSERT INTO #T1 ([Description]) VALUES ('desc1')
INSERT INTO #T1 ([Description]) VALUES ('desc2')
INSERT INTO #T1 ([Description]) VALUES ('desc3')
-- Table 2 test data
Create Table #T2
(
[Institution] nvarchar(30)
)
INSERT INTO #T2 (Institution) VALUES ('Inst1')
INSERT INTO #T2 (Institution) VALUES ('Inst2')
INSERT INTO #T2 (Institution) VALUES ('Inst3')
-- Create table 3
Create Table #T3
(
[Description] nvarchar(30),
[Institution] nvarchar(30)
);
-- Use CTE2 to add row numbers to the data; use the row numbers to join the tables
-- you must specify the sort order for the data in the tables
WITH CTE1 (Description, RowNum) AS
(
SELECT [Description], ROW_NUMBER() OVER(ORDER BY [Description]) as RowNum
FROM #T1
),
CTE2 (Institution, RowNum) AS
(
SELECT Institution, ROW_NUMBER() OVER(ORDER BY Institution) as RowNum
FROM #T2
)
INSERT INTO #T3
SELECT CTE1.Description, CTE2.Institution
FROM CTE1
LEFT JOIN CTE2 ON CTE1.RowNum = CTE2.RowNum
Select * from #T3