Cursor, Conditional Split Task, Nested Joins In SSIS
Hello
Can anybody help me out in
1) implementing cursors in SSIS. I want to process each row at a time from a dataset. I was trying to use Foreachloop container but in vain. Can you please answer in detail.
my few other questions are:
1) Can i do nested inner join in SSIS. If yes, how? ( I have three table i need to join Tab1 to table 2 and get join the table 3 to get the respective data)
2) I have a resultsets. I want to split the data according to data in a col.
Say for instance:
Col1 Col2
A 1
A 2
B 3
C 4
C 5
i want to split the data according A, B and C . i.e., if Col1= A then do this, if Col1= B then do this..etc. How can i do this using conditional split task in SSIS
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Complexity Of Nested Self Left Joins?
Hi,I'm curious about the computational complexity of a query I have. Thequery contains multiple nested self left joins, starting with a simpleselect, then doing a self left join with the results, then doing a selfleft join with those results, etc. What puzzles me is that the timerequired for the query seems to grow exponentially as I add additionalleft joins, which I didn't expect. I expected the inner select toreturn about 25 rows (it does), then I expected the self join to resultin about 25 rows (it does), etc. Each join just adds another column; itdoesn't add more rows. So the left part of the join is staying the samesize, and so is the right part of the join, since I'm always joiningwith the same table.So I would think the time for this query should be (time to join 25rows against the source table) * (num joins), but it seems to besomething like (num rows) ^ (num joins). Any ideas? I'm just trying tounderstand the system a little better. (But if you have any ideas aboutimproving the query, I'm always open to those, too.)The execution plan is what you'd expect: an index seek loop-joined withanother index seek, the results of which are merge-joined with anotherindex seek, the results of which are merge-joined with another indexseek, ad nauseum, until a final "compute scalar cost (39%)" and "select(0%)"For the brave and curious, I've pasted the query below.Thanksselect right(x.cp_yyyymm, 2)+'-'+left(x.cp_yyyymm, 4) as [Month],table0.cp_num_loans/1 as [AFCM9704], table1.cp_num_loans/1 as[AFC9104], table2.cp_num_loans/1 as [BFAT01C], table3.cp_num_loans/1 as[BFAT02B], table4.cp_num_loans/1 as [BFAT03D], table5.cp_num_loans/1 as[BFAT03E], table6.cp_num_loans/1 as [BFAT03F], table7.cp_num_loans/1 as[BFAT04A], table8.cp_num_loans/1 as [BFAT04C], table9.cp_num_loans/1 as[BFAT04D], table10.cp_num_loans/1 as [BFAT99C] from (((((((((((selectdistinct cp_yyyymm from cp_deal_history where cp_deal_id in('AFCM9704', 'AFC9104', 'BFAT01C', 'BFAT02B', 'BFAT03D', 'BFAT03E','BFAT03F', 'BFAT04A', 'BFAT04C', 'BFAT04D', 'BFAT99C') and cp_yyyymmbetween 200304 and 200504) as x left join (select cp_yyyymm,cp_num_loans from cp_deal_history where cp_deal_id='AFCM9704') astable0 on x.cp_yyyymm=table0.cp_yyyymm) left join (select cp_yyyymm,cp_num_loans from cp_deal_history where cp_deal_id='AFC9104') as table1on x.cp_yyyymm=table1.cp_yyyymm) left join (select cp_yyyymm,cp_num_loans from cp_deal_history where cp_deal_id='BFAT01C') as table2on x.cp_yyyymm=table2.cp_yyyymm) left join (select cp_yyyymm,cp_num_loans from cp_deal_history where cp_deal_id='BFAT02B') as table3on x.cp_yyyymm=table3.cp_yyyymm) left join (select cp_yyyymm,cp_num_loans from cp_deal_history where cp_deal_id='BFAT03D') as table4on x.cp_yyyymm=table4.cp_yyyymm) left join (select cp_yyyymm,cp_num_loans from cp_deal_history where cp_deal_id='BFAT03E') as table5on x.cp_yyyymm=table5.cp_yyyymm) left join (select cp_yyyymm,cp_num_loans from cp_deal_history where cp_deal_id='BFAT03F') as table6on x.cp_yyyymm=table6.cp_yyyymm) left join (select cp_yyyymm,cp_num_loans from cp_deal_history where cp_deal_id='BFAT04A') as table7on x.cp_yyyymm=table7.cp_yyyymm) left join (select cp_yyyymm,cp_num_loans from cp_deal_history where cp_deal_id='BFAT04C') as table8on x.cp_yyyymm=table8.cp_yyyymm) left join (select cp_yyyymm,cp_num_loans from cp_deal_history where cp_deal_id='BFAT04D') as table9on x.cp_yyyymm=table9.cp_yyyymm) left join (select cp_yyyymm,cp_num_loans from cp_deal_history where cp_deal_id='BFAT99C') astable10 on x.cp_yyyymm=table10.cp_yyyymm order by x.cp_yyyymm
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Nested SQl With Count, Percent And Joins: How?!
Hiya, I have a need for a complex SQL statement to provide reporting information, but the SQL is way over my head and although I have some of the elements, I can't seem to pull them together to create a working SQL statement. My database structure is as outlined below: tblDef ------ ID IRVitems ABC A1,A2,A3,A4,A5 tblIRV ------ ID IRVvalues 001 1,5,text1,10,3 002 2,1,text2,1,3 003 2,4,text3,1,1 004 1,4,text4,4,1 005 1,2,text5,4,1 tblLabel -------- lblID lblVALUE lblTXT A1 1 AAA A1 2 BBB I currently query tblDef to get IRVitems and in turn then query the other two tables to get statistical information to present in a report (via ASP). For each item returned from IRVitems, I would like to report the spread and frequency of different values as follows: A1 Value Label Count Percent 1 AAA 3 60 2 BBB 2 40 and then for A2, etc (although missing out A3 as it is a text item, but I can deal with that via ASP code beforehand). I would expect to have to hit the DB for each of the IRVitems (so once for getting the data for A1, againfor A2, etc). I was provided a great bit of code to use SUBSTRING and GROUP BY to get this data (thanks zuomin), but I didn't consider the possible text values or numbers >9 when defining what I was trying to do (to be fair, they're new requirements): SELECT SUBSTRING(IRVvalues, 1, 1) AS Value, COUNT(ID) AS Count FROM tblIRV GROUP BY SUBSTRING(IRVvalues, 1, 1) ORDER BY value which returns like this: Value Count 1 187 2 163 3 2 Can I do a similar query to get all the info I need in one go? I saw the articale on a user-defined 'split' function (http://code.msdn.microsoft.com/SQLExamples/Wiki/View.aspx?title=StringArrayInput&referringTitle=Home) that can be used to split up the IRVvalues string to access the position I need in the array, but I'm a little clueless on how to then embed that into a SQl statement. Can anyone point me in the right direction please?
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Short Circuit Evaluation In Conditional Split Expression
I think I know the answer to this but thought I'd ask anyway. I have a conditional split to check a column for null values or empty string values. It looks like this: (!ISNULL(Ballot)) || (LEN(TRIM(Ballot)) > 0) My question is: Are both sides of the expression evaluated? My testing says yes, because a Null value causes an error. Is there a way to short circuit the evaluation like the || operator in C# or the (less than elegant, and seemingly threatening) OrElse operator in VB? Whats the best alternative: A slightly more complex expression that turns a null value into an empty string A script component Two conditional splits Two paths out of one condtional split I went with the first option, here is the expression I came up with: LEN(ISNULL(Ballot) ? "" : TRIM(Ballot)) > 0
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