It doesn't seem that any amount of reading the docs will help me. Consider the simplified example:
declare #table1 table ( id int, parent xml )
insert #table1 values( 1, '<Root></Root>' )
declare #table2 table ( id int, guts xml )
insert #table2 values( 1, '<Guts>hi mom!</Guts>' )
select t1.parent.query('')
from #table1 t1 inner join #table2 t2 on t1.id = t2.id
What would be passed to the query function to generate this result?
<Root><Guts>hi mom!</Guts></Root>
The following is not set based, but maybe it will help (SQL2008 only)
declare #table1 table ( id int, parent xml )
insert #table1 values( 1, '<Root></Root>' )
declare #table2 table ( id int, guts xml )
insert #table2 values( 1, '<Guts>hi mom!</Guts>' )
DECLARE #id int;
DECLARE #results table (id int, results xml);
DECLARE idCursor CURSOR FOR
select id from #table1
OPEN idCursor
FETCH NEXT FROM idCursor INTO #id
WHILE ##FETCH_STATUS = 0
BEGIN
DECLARE #parent xml, #guts xml
SELECT #parent = parent FROM #table1 where id = 1;
SELECT #guts = guts FROM #table2 where id = 1;
SET #parent.modify('insert sql:variable("#guts") into (/Root[1])');
INSERT #results (id, results) values (#id, #parent);
FETCH NEXT FROM idCursor INTO #id
END
CLOSE idCursor
DEALLOCATE idCursor
select * from #results;
You are asking for an XML operation, not for a relational operation. What you want is to produce a new XML by inserting a fragment of XML into it, which means you have to use the xml.modify() method. Technically this is possible, but the modify() must be called within an update context, so it won't work in a SELECT. It can work in a SET or in an UPDATE:
UPDATE t1
SET parent.modify(N'insert sql:column("t2.guts") into (/Root)[1]')
FROM #table1 t1
JOIN #table2 t2 on t1.id = t2.id;
SELECT * from #table1;
If you must have the result in a SELECT then you'll have to shred the XML into relational table, join that and reconstruct the XML back using FOR XML.
Related
I have to query specific order of string IDs example data:
| ID | RES |
---------------
| A_12 | 1.89 |
| B_27 | 4.53 |
| B_28 | 1.02 |
| C_23 | 2.67 |
A tool generated a specific order which does not follow any standard ordering rule, and I cannot change that order.
I am getting ~20000 of these rows and the RES is misaligned.
I'd like to make a simple query which would collect all needed records by a list IDs and would give me a custom defined ordered list of results.
Something like:
SELECT RES FROM TABLE1 WHERE ID IN ('A_12', 'C_23', 'B_28', 'B_27')
and I'd lke it to return
1.89
2.67
1.02
4.53
I understand IN query would not follow order as under the hood it most likely gets translated to (ID = A OR ID = B OR ID = C) query.
How do I enforce the result of the IN query to maintain my defined order? Do I need to create a temp table with one column for maintaining order? Any good solutions?
Use JOIN instead of using IN and explicitly specify your order:
DECLARE #Test TABLE (
ID VARCHAR(32),
RES DECIMAL(5,2)
)
INSERT #Test (ID, RES)
VALUES
('A_12', 1.89),
('B_27', 4.53),
('B_28', 3.54),
('C_23', 2.67)
SELECT t.ID, t.RES
FROM #Test t
JOIN (
VALUES
('A_12', 1),
('C_23', 2),
('B_28', 3),
('B_27', 4)
) o(ID, OrderId) ON t.ID = o.ID
ORDER BY o.OrderId
Instead of temp table you can use values where you specify the desired order in the additional column, like this:
declare #table1 table(id varchar(10), res decimal(10,2));
insert into #table1 (id, res)
values
('A_12', 1.89),
('B_27', 4.53),
('B_28', 3.54),
('C_23', 2.67);
select t.*
from #table1 t
join (values(1, 'A_12'), (2, 'C_23'), (3, 'B_28'), (4, 'B_27')) v(id,val)
on t.id = v.val
order by v.id;
#Table1 here is a substitute of your physical Table1.
There is no order to keep.
Returns of a select are NOT ORDERED by SQL basic definition, UNLESS YOU DEFINE AN ORDER.
So, there is no order to keep. Period.
If you want to keep one, use a temporary table / table variable for the valeus in IN (and obviously a join) and order by an order you also keep in a second field in said variable.
And no, this is not new - SQL is based on the SET theorem ever since Cobb published his famous paper back in the 1960s or so and never had order in returned results outside of side effects of implementation.
Do I need to create a temp table with one column for maintaining order
This seems to be working:
create table #tmp
(
CustomOrder int,
ID varchar(100)
)
insert into #tmp values (1, 'A_12')
insert into #tmp values (2, 'C_23')
insert into #tmp values (3, 'B_28')
insert into #tmp values (4, 'B_27')
query:
SELECT RES FROM TABLE1 INNER JOIN #tmp ON TABLE1.ID = #tmp.ID WHERE TABLE1.ID IN ('A_12', 'C_23', 'B_28', 'B_27')
ORDER BY #tmp.CustomOrder
output:
1.89
2.67
1.02
4.53
Any better and easier solution?
Just a different approach:
SELECT RES FROM TABLE1 WHERE ID IN ('A_12')
UNION ALL
SELECT RES FROM TABLE1 WHERE ID IN ('C_23')
UNION ALL
SELECT RES FROM TABLE1 WHERE ID IN ('B_28')
UNION ALL
SELECT RES FROM TABLE1 WHERE ID IN ('B_27')
I supposed that the JOIN option is more efficent than this approach. If you want to automatize this option:
DROP TABLE #TABLE1
CREATE TABLE #TABLE1(ID NVARCHAR(4), RES FLOAT)
INSERT INTO #TABLE1 VALUES('A_12',1.89)
INSERT INTO #TABLE1 VALUES('B_27',4.53)
INSERT INTO #TABLE1 VALUES('B_28',1.02)
INSERT INTO #TABLE1 VALUES('C_23',2.67)
DECLARE #ID TABLE(ID NVARCHAR(4) not null);
--HERE HAVE TO INSERT IN ORDER YOU WANT TO RETURN THE RESULTS IN THE QUERY
insert into #ID VALUES('A_12')
insert into #ID VALUES('B_27')
insert into #ID VALUES('B_28')
insert into #ID VALUES('C_23')
DECLARE #UNIONALL NVARCHAR(10) = CHAR(13) + N'UNION ALL'
DECLARE #QUERY NVARCHAR(MAX) = NULL
DECLARE #ID_SEARCH NVARCHAR(4) = NULL
DECLARE C CURSOR FAST_FORWARD FOR SELECT ID FROM #ID
OPEN C
FETCH NEXT FROM C INTO #ID_SEARCH
SET #QUERY = N'SELECT RES FROM #TABLE1 WHERE ID = ''' + #ID_SEARCH + ''' '
FETCH NEXT FROM C INTO #ID_SEARCH
WHILE ##FETCH_STATUS = 0 BEGIN
SET #QUERY = #QUERY + #UNIONALL
SET #QUERY = #QUERY + N' SELECT RES FROM #TABLE1 WHERE ID = ''' + #ID_SEARCH + ''' '
FETCH NEXT FROM C INTO #ID_SEARCH
END
EXECUTE master..sp_executesql #QUERY
I have a table called #Tbl1, Each GROUP is 1 row and I have to extract the number of rows for each to #Tbl_Insert type.
Declare #Tbl1 Table (TableName NVARCHAR(250),ColumnName NVARCHAR(250),DataType NVARCHAR(250),DataValue NVARCHAR(250),InGroup NVARCHAR(250))
Declare #Tbl_Insert Table (ID INT, Name NVARCHAR(250), Age INT)
-- Sample Data
Insert Into #Tbl1 values ('#Tbl_Insert','ID','INT','1','Group1'),('#Tbl_Insert','Name','NVARCHAR(250)','John.Adam','Group1'),('#Tbl_Insert','Age','INT','10','Group1')
Insert Into #Tbl1 values ('#Tbl_Insert','ID','INT','2','Group2'),('#Tbl_Insert','Name','NVARCHAR(250)','Andy.Law','Group2'),('#Tbl_Insert','Age','INT','18','Group2')
I can convert #tbl1 to row by row into #Table_TEMP
Declare #Table_TEMP (Data nvarchar(max))
Insert Into #Table_TEMP
SELECT LEFT([DataValues] , LEN([DataValues] )-1)
FROM #Tbl1 AS extern
CROSS APPLY
(
SELECT Concat('''', Replace( ISNULL([DataValue],''), '''','' ) + ''',')
FROM #Tbl1 AS intern
WHERE extern.InGroup = intern.InGroup
Order By InGroup, ColumnName
FOR XML PATH('')
) pre_trimmed ( [DataValues])
GROUP BY InGroup, [DataValues]
I have to extract the number of rows in #Tbl1 ( Or #Table_TEMP) to #Tbl_Insert.
I don't want to use cursor to loop Insert row by row in #Table_TEMP, because, when you met with big data (example > 10000 rows). It's run to slow.
Please help.
I found sample in stackorverflow
Declare #tbl_Temp Table (Data NVARCHAR(MAX))
Declare #tbl2 Table (A NVARCHAR(MAX),B NVARCHAR(MAX),C NVARCHAR(MAX))
Insert Into #tbl_Temp values ('a1*b1*c1')
INSERT INTO #tbl2 (A,B,C)
SELECT PARSENAME(REPLACE(Data,'*','.'),3)
,PARSENAME(REPLACE(Data,'*','.'),2)
,PARSENAME(REPLACE(Data,'*','.'),1)
FROM #tbl_Temp
select * from #tbl2
It's nearly the same, but,
My data have "DOT", can not use PARSENAME
I must know numbers of DOT to Build Dynamics SQL??
PARSENAME only support 3 "DOT", It's null when More Dot.
EXAMPLE:
Declare #ObjectName nVarChar(1000)
Set #ObjectName = 'HeadOfficeSQL1.Northwind.dbo.Authors'
SELECT
PARSENAME(#ObjectName, 5) as Server4,
PARSENAME(#ObjectName, 4) as Server,
PARSENAME(#ObjectName, 3) as DB,
PARSENAME(#ObjectName, 2) as Owner,
PARSENAME(#ObjectName, 1) as Object
If, i understand correctly you will need to use apply in order to fetch the records & insert the data into other table
insert into #Tbl_Insert (ID, Name, Age)
select max(a.id) [id], max(a.Name) [Name], max(a.Age) [Age] from #Tbl1 t
cross apply
(values
(case when t.ColumnName = 'ID' then t.DataValue end,
case when t.ColumnName = 'Name' then t.DataValue end,
case when t.ColumnName = 'Age' then t.DataValue end, t.InGroup)
) as a(id, Name, Age, [Group])
group by a.[Group]
select * from #Tbl_Insert
I do both #Tbl_Insert & create 1 store to do like PARSENAME. It's improved performance.
create function dbo.fnGetCsvPart(#csv varchar(8000),#index tinyint, #last bit = 0)
returns varchar(4000)
as
/* function to retrieve 0 based "column" from csv string */
begin
declare #i int; set #i = 0
while 1 = 1
begin
if #index = 0
begin
if #last = 1 or charindex(',',#csv,#i+1) = 0
return substring(#csv,#i+1,len(#csv)-#i+1)
else
return substring(#csv,#i+1,charindex(',',#csv,#i+1)-#i-1)
end
select #index = #index-1, #i = charindex(',',#csv,#i+1)
if #i = 0 break
end
return null
end
GO
I have a table as follows
cat_id Cat_Name Main_Cat_Id
1 veg null
2 main course 1
3 starter 1
4 Indian 2
5 mexican 2
6 tahi 3
7 chinese 3
8 nonveg null
9 main course 8
10 indian 9
11 starter 8
12 tahi 11
13 chinese 11
(Main_Cat_Id is cat_id of previously added category in which it belongs)
This table is used for the categories the product where veg category has the two sub category main course and starter which is identify by main_cat_id
and those subcategories again has sub category as indian and mexican
And this categorization is dependent on the user; he can add more sub categories to indian, mexican also so that he can have any level of categorization
now I have to select all the subcategories of any node like if I take veg i have to select
(1)veg > (2)main course(1) > (4)indian(2)
> (5)mexican(2)
> (3)starter(1) > (6)thai(3)
> (7)chinese(3)
to form the string as 1,2,4,5,3,6,7
to do this i wrote a sql function as
CREATE FUNCTION [dbo].[GetSubCategory_TEST]
( #MainCategory int, #Category varchar(max))
RETURNS varchar(max)
AS
BEGIN
IF EXISTS (SELECT Cat_Id FROM Category WHERE Main_Cat_Id=#MainCategory)
BEGIN
DECLARE #TEMP TABLE
(
CAT_ID INT
)
INSERT INTO #TEMP(CAT_ID) SELECT Cat_Id FROM Category WHERE Main_Cat_Id=#MainCategory
DECLARE #TEMP_CAT_ID INT
DECLARE CUR_CAT_ID CURSOR FOR SELECT CAT_ID FROM #TEMP
OPEN CUR_CAT_ID
WHILE 1 =1
BEGIN
FETCH NEXT FROM CUR_CAT_ID
INTO #TEMP_CAT_ID;
IF ##FETCH_STATUS <> 0
SET #Category=#Category+','+ CONVERT(VARCHAR(50), #TEMP_CAT_ID)
SET #Category = [dbo].[GetSubCategory](#TEMP_CAT_ID,#Category)
END
CLOSE CUR_CAT_ID
DEALLOCATE CUR_CAT_ID
END
return #Category
END
but this function keep on executing and not gives the desired output i don't understands what wrong is going on plz help me to get this
You dont need a recursive function to build this, you can use a Recursive CTE for that.
Something like
DECLARE #TABLE TABLE(
cat_id INT,
Cat_Name VARCHAR(50),
Main_Cat_Id INT
)
INSERT INTO #TABLE SELECT 1,'veg',null
INSERT INTO #TABLE SELECT 2,'main course',1
INSERT INTO #TABLE SELECT 3,'starter',1
INSERT INTO #TABLE SELECT 4,'Indian',2
INSERT INTO #TABLE SELECT 5,'mexican',2
INSERT INTO #TABLE SELECT 6,'tahi',3
INSERT INTO #TABLE SELECT 7,'chinese',3
INSERT INTO #TABLE SELECT 8,'nonveg',null
INSERT INTO #TABLE SELECT 9,'main course',8
INSERT INTO #TABLE SELECT 10,'indian',9
INSERT INTO #TABLE SELECT 11,'starter',8
INSERT INTO #TABLE SELECT 12,'tahi',11
INSERT INTO #TABLE SELECT 13,'chinese',11
;WITH Recursives AS (
SELECT *,
CAST(cat_id AS VARCHAR(MAX)) + '\' ID_Path
FROM #TABLE
WHERE Main_Cat_Id IS NULL
UNION ALL
SELECT t.*,
r.ID_Path + CAST(t.cat_id AS VARCHAR(MAX)) + '\'
FROM #TABLE t INNER JOIN
Recursives r ON t.Main_Cat_Id = r.cat_id
)
SELECT *
FROM Recursives
I am ashamed, but I used #astander scipt to give string result.
First I created data you gave.
Second I collect rows which I need
And then using XML I put everything in one row (function STUFF removes first comma)
DECLARE #TABLE TABLE(
cat_id INT,
Cat_Name VARCHAR(50),
Main_Cat_Id INT
)
DECLARE #Collected TABLE(
cat_id INT
)
INSERT INTO #TABLE SELECT 1,'veg',null
INSERT INTO #TABLE SELECT 2,'main course',1
INSERT INTO #TABLE SELECT 3,'starter',1
INSERT INTO #TABLE SELECT 4,'Indian',2
INSERT INTO #TABLE SELECT 5,'mexican',2
INSERT INTO #TABLE SELECT 6,'tahi',3
INSERT INTO #TABLE SELECT 7,'chinese',3
INSERT INTO #TABLE SELECT 8,'nonveg',null
INSERT INTO #TABLE SELECT 9,'main course',8
INSERT INTO #TABLE SELECT 10,'indian',9
INSERT INTO #TABLE SELECT 11,'starter',8
INSERT INTO #TABLE SELECT 12,'tahi',11
INSERT INTO #TABLE SELECT 13,'chinese',11
INSERT INTO #TABLE SELECT 14,'chinese',6
DECLARE #nodeID INT = 1;
DECLARE #result VARCHAR(MAX);
;WITH Recursives AS (
SELECT cat_id, main_cat_id
FROM #TABLE
WHERE Cat_Id = #nodeID
UNION ALL
SELECT T.cat_id, T.main_cat_id
FROM #TABLE AS T
INNER JOIN Recursives AS R
ON t.Main_Cat_Id = r.cat_id
)
INSERT INTO #Collected
SELECT cat_id
FROM Recursives
SELECT #result = STUFF(
(SELECT ',' + CAST( cat_id AS VARCHAR)
FROM #Collected
ORDER BY cat_id
FOR XML PATH('')
), 1,1,'')
SELECT #result
Your cursor is looping infinitely because you asked it to keep going until 1 no longer equals 1:
WHILE 1 =1
1=1 is always true so the loop never ends, and you don't explicitly break out of it anywhere.
You would do well to study some examples of cursors, for example this one in the Microsoft T-SQL documentation. They are quite formulaic and the main syntax rarely needs to vary much.
The standard approach after opening the cursor is to do an initial fetch next to get the first result, then open a while loop conditional on ##FETCH_STATUS = 0 (0 meaning successful).
Because you're looking only for unsuccessful cursor fetch states inside your cursor:
IF ##FETCH_STATUS <> 0
The setting of #Category will only happen once the cursor has gone past the last row in the set. I suspect this is exactly what you don't want.
I'm also not sure about the scoping of the #Category variable, since it's an input parameter to the function; I generally create new variables inside a function to work with, but off the top of my head I'm not sure this will actually create a problem or not.
More generally, although I don't totally understand what you're trying to achieve here, a recursive function involving a cursor is probably not the right way to do it, as Adriaan Stander's answer suggests.
In php I'm executing multiple queries at once, the queries are wrote in one big variable.
These are insert queries and I have to retrieve each autoincrement "id" of the records created in the db. How to do it ?
The results set retrieved don't seems to keep each single result but just one.
I think that you are talking about an OUTPUT clause from the insert statement.
http://msdn.microsoft.com/en-us/library/ms177564.aspx
CREATE TABLE #t (id int identity (1, 1), f1 nvarchar(20 ) ) --the table that has the identities
CREATE TABLE #ids ( id int ) --the table to store the inserts into table #t
INSERT INTO #t ( f1 ) OUTPUT INSERTED.id INTO #ids SELECT N'AAAA'
INSERT INTO #t ( f1 ) OUTPUT INSERTED.id INTO #ids SELECT N'BBBB'
INSERT INTO #t ( f1 ) OUTPUT INSERTED.id INTO #ids SELECT N'CCCC'
SELECT * FROM #t
SELECT * FROM #ids
Another way is to use ##IDENTITY or SCOPE_IDENTITY() SQL Authority link discussing/comparing them
CREATE TABLE #t (id int identity (1, 1), f1 nvarchar(20 ) )
CREATE TABLE #ids ( id int )
INSERT INTO #t ( f1 ) SELECT N'AAAA'
INSERT INTO #ids SELECT ##IDENTITY --OR you can use SELECT SCOPE_IDENTITY()
INSERT INTO #t ( f1 ) SELECT N'BBBB'
INSERT INTO #ids SELECT ##IDENTITY --OR you can use SELECT SCOPE_IDENTITY()
INSERT INTO #t ( f1 ) SELECT N'CCCC'
INSERT INTO #ids SELECT ##IDENTITY --OR you can use SELECT SCOPE_IDENTITY()
SELECT * FROM #t
SELECT * FROM #ids
I have a table where the data are like
Data
a
b
c
I need to write a SQL query to bring the following output
Data
abc
How to do the same by using in SQL Server 2000
Thanks
I don't know how/if it can be done with XML RAW. This approach works in SQL2000 though.
DECLARE #Data varchar(8000)
set #Data =''
select #Data = #Data + Data
FROM #t
ORDER BY Data
SELECT #Data
Edit Oh I've just seen your other question where Cade gave you a link. Doesn't KM's answer on that link work for you?
KM's test query
--combine parent and child, children are CSV onto parent row
CREATE TABLE #TableA (RowID int, Value1 varchar(5), Value2 varchar(5))
INSERT INTO #TableA VALUES (1,'aaaaa','A')
INSERT INTO #TableA VALUES (2,'bbbbb','B')
INSERT INTO #TableA VALUES (3,'ccccc','C')
CREATE TABLE #TableB (RowID int, TypeOf varchar(10))
INSERT INTO #TableB VALUES (1,'wood')
INSERT INTO #TableB VALUES (2,'wood')
INSERT INTO #TableB VALUES (2,'steel')
INSERT INTO #TableB VALUES (2,'rock')
INSERT INTO #TableB VALUES (3,'plastic')
INSERT INTO #TableB VALUES (3,'paper')
SELECT
a.*,dt.CombinedValue
FROM #TableA a
LEFT OUTER JOIN (SELECT
c1.RowID
,STUFF(REPLACE(REPLACE(
(SELECT
', ' + TypeOf as value
FROM (SELECT
a.RowID,a.Value1,a.Value2,b.TypeOf
FROM #TableA a
LEFT OUTER JOIN #TableB b ON a.RowID=b.RowID
) c2
WHERE c2.rowid=c1.rowid
ORDER BY c1.RowID, TypeOf
FOR XML RAW
)
,'<row value="',''),'"/>','')
, 1, 2, '') AS CombinedValue
FROM (SELECT
a.RowID,a.Value1,a.Value2,b.TypeOf
FROM #TableA a
LEFT OUTER JOIN #TableB b ON a.RowID=b.RowID
) c1
GROUP BY RowID
) dt ON a.RowID=dt.RowID