itzik ben-gan

I am using the following query which I found from a fragmanet of code
by itzik ben-gan to assign a common group id for group of records in my
case which have similar SSN and first Name and Last Name. if the SSN is
the same it should also check the first name and last name of the
record. Becuase records have more than three AKA names, I need to check
all the possibilities of first name last name combination to verify the
records are the same.
This code works fine and can assign group numbers for all the rows.
I am trying this code on a database of 65,000 rows. It's taking around
20 minute to complete. but I'll have to run the same code on
800,000,000 rows.
It will take years to finish.
even if the query is optimized to run in 1 second for 65,000 rows, it
will take more than 4 hours to run on the 800,000,000 row. This where I
realized I am in the "wrong jungle".
1. is there any other feasible and faster way to do this? very
important issue.
2. while assigning group number, it doesn't give sequential numbers. It
skips some of the numbers( group Number 1,2 5,9...) just curiouse(
not very important)
SELECT c1.fname, c1.lname, c1.ssn , c3.tu_id,
(SELECT 1 + count(*)
FROM distFLS AS c2
WHERE c2.ssn < c1.ssn
or (c2.ssn = c1.ssn and (substring(c2.fname,1,1) =
substring(c1.fname,1,1) or substring(c2.lname,1,1) =
substring(c1.lname,1,1)
or substring(c2.fname,1,1) =
substring(c1.lname,1,1) or substring(c2.lname,1,1) =
substring(c1.fname,1,1))
)) AS grp_num
into tmp_FLS
FROM distFLS AS c1
JOIN tu_people_data AS c3
ON (c1.ssn = c3.ssn and
c1.fname = c3.fname and
c1.lname= c3.lname)
GO
distinct firstname, lastname and SSN table from the tu_people_data.
I created this table to increase the query performance.
CREATE TABLE [distFLS] (
[fname] [varchar] (32) COLLATE Latin1_General_CI_AS NULL ,
[lname] [varchar] (32) COLLATE Latin1_General_CI_AS NULL ,
[ssn] [int] NULL
) ON [PRIMARY]
GO
CREATE TABLE [TU_People_Data] (
[tu_id] [bigint] NOT NULL ,
[count_id] [int] NOT NULL ,
[fname] [varchar] (32) COLLATE Latin1_General_CI_AS NULL ,
[lname] [varchar] (32) COLLATE Latin1_General_CI_AS NULL ,
[ssn] [int] NULL ,
CONSTRAINT [PK_tu_bulk_people] PRIMARY KEY CLUSTERED
(
[tu_id],
[count_id]
) ON [PRIMARY]
) ON [PRIMARY]
GO
sample data
there is a column count_id after the tu_id and before fname(tu_id and
count_id are primary keys)
tu_id fname lname SSN
156078480 KRISINA WALSH 999999000
156078480 KRISTINA GIERER 999999000
156078480 KRISTINA WALSH 999999000
151257883 J SOTO 999999111
151257883 JOSE LARIOS 999999111
151257883 JOSE SOTO 999999111
151257883 L SOTO 999999111
136312525 ELADIO GARCIA 999999222
136312525 ELADIO NAVA 999999222
136312525 ELADIO NAVAGARCIA 999999222
136312525 GARCIA NAVA 999999222
149180940 DARREN SAUERWINE 999999333
149180940 DARREN SUAERWIN 999999333First, examine the 65,000 T-SQL in Query Analyzer using the Show Execution
Plan feature and confirm that the select portion of the query is using
efficient index ss.
http://msdn.microsoft.com/library/d... />
1_5pde.asp
Also, when inserting, updating, or deleting a massive amount of data (ex > 1
million rows), you start running into series issues with the CPU, I/O, and
disk storage consumed by transaction logging. I assure you that attempting
to update 800 million rows in a single batch will take much longer than 4
hours, regardless of your server configuration. Do a goole search of the
*sqlserver* newsgroups using the keywords "transaction log" "million" and
"hours". There are techniques for minimizing transaction logging and
performing the updates or inserts in batches using a looping method. You
will also need to coordinate with the network admin and allocate the storage
space on the SAN ahead of time.
http://groups.google.com/groups? as...n
um=100
Once done, there are also the issues of logical index fragmentation and
physical extent fragmentation, etc.
Don't fire this up on a Friday evening and expect it to run over the
wend; it could be a w long project at best.
<jacob.dba@.gmail.com> wrote in message
news:1141687843.303092.247700@.i39g2000cwa.googlegroups.com...
>I am using the following query which I found from a fragmanet of code
> by itzik ben-gan to assign a common group id for group of records in my
> case which have similar SSN and first Name and Last Name. if the SSN is
> the same it should also check the first name and last name of the
> record. Becuase records have more than three AKA names, I need to check
> all the possibilities of first name last name combination to verify the
> records are the same.
> This code works fine and can assign group numbers for all the rows.
> I am trying this code on a database of 65,000 rows. It's taking around
> 20 minute to complete. but I'll have to run the same code on
> 800,000,000 rows.
> It will take years to finish.
> even if the query is optimized to run in 1 second for 65,000 rows, it
> will take more than 4 hours to run on the 800,000,000 row. This where I
> realized I am in the "wrong jungle".
> 1. is there any other feasible and faster way to do this? very
> important issue.
> 2. while assigning group number, it doesn't give sequential numbers. It
> skips some of the numbers( group Number 1,2 5,9...) just curiouse(
> not very important)
> SELECT c1.fname, c1.lname, c1.ssn , c3.tu_id,
> (SELECT 1 + count(*)
> FROM distFLS AS c2
> WHERE c2.ssn < c1.ssn
> or (c2.ssn = c1.ssn and (substring(c2.fname,1,1) =
> substring(c1.fname,1,1) or substring(c2.lname,1,1) =
> substring(c1.lname,1,1)
> or substring(c2.fname,1,1) =
> substring(c1.lname,1,1) or substring(c2.lname,1,1) =
> substring(c1.fname,1,1))
> )) AS grp_num
> into tmp_FLS
> FROM distFLS AS c1
> JOIN tu_people_data AS c3
> ON (c1.ssn = c3.ssn and
> c1.fname = c3.fname and
> c1.lname= c3.lname)
> GO
> distinct firstname, lastname and SSN table from the tu_people_data.
> I created this table to increase the query performance.
> CREATE TABLE [distFLS] (
> [fname] [varchar] (32) COLLATE Latin1_General_CI_AS NULL ,
> [lname] [varchar] (32) COLLATE Latin1_General_CI_AS NULL ,
> [ssn] [int] NULL
> ) ON [PRIMARY]
> GO
>
> CREATE TABLE [TU_People_Data] (
> [tu_id] [bigint] NOT NULL ,
> [count_id] [int] NOT NULL ,
> [fname] [varchar] (32) COLLATE Latin1_General_CI_AS NULL ,
> [lname] [varchar] (32) COLLATE Latin1_General_CI_AS NULL ,
> [ssn] [int] NULL ,
> CONSTRAINT [PK_tu_bulk_people] PRIMARY KEY CLUSTERED
> (
> [tu_id],
> [count_id]
> ) ON [PRIMARY]
> ) ON [PRIMARY]
> GO
>
> sample data
> there is a column count_id after the tu_id and before fname(tu_id and
> count_id are primary keys)
> tu_id fname lname SSN
> 156078480 KRISINA WALSH 999999000
> 156078480 KRISTINA GIERER 999999000
> 156078480 KRISTINA WALSH 999999000
> 151257883 J SOTO 999999111
> 151257883 JOSE LARIOS 999999111
> 151257883 JOSE SOTO 999999111
> 151257883 L SOTO 999999111
> 136312525 ELADIO GARCIA 999999222
> 136312525 ELADIO NAVA 999999222
> 136312525 ELADIO NAVAGARCIA 999999222
> 136312525 GARCIA NAVA 999999222
> 149180940 DARREN SAUERWINE 999999333
> 149180940 DARREN SUAERWIN 999999333
>

itzik ben-gan

I am using the following query which I found from a fragmanet of code
by itzik ben-gan to assign a common group id for group of records in my

case which have similar SSN and first Name and Last Name. if the SSN is

the same it should also check the first name and last name of the
record. Becuase records have more than three AKA names, I need to check

all the possibilities of first name last name combination to verify the

records are the same.
This code works fine and can assign group numbers for all the rows.
I am trying this code on a database of 65,000 rows. It's taking around
20 minute to complete. but I'll have to run the same code on
800,000,000 rows.
It will take years to finish.
even if the query is optimized to run in 1 second for 65,000 rows, it
will take more than 4 hours to run on the 800,000,000 row. This where I

realized I am in the "wrong jungle".
1. is there any other feasible and faster way to do this? very
important issue.
2. while assigning group number, it doesn't give sequential numbers. It

skips some of the numbers( group Number 1,2 5,9...) just curiouse(
not very important)

SELECT c1.fname, c1.lname, c1.ssn , c3.tu_id,
(SELECT 1 + count(*)
FROM distFLS AS c2
WHERE c2.ssn < c1.ssn
or (c2.ssn = c1.ssn and (substring(c2.fname,1,1) =
substring(c1.fname,1,1) or substring(c2.lname,1,1) =
substring(c1.lname,1,1)
or substring(c2.fname,1,1) =
substring(c1.lname,1,1) or substring(c2.lname,1,1) =
substring(c1.fname,1,1))
)) AS grp_num
into tmp_FLS
FROM distFLS AS c1
JOIN tu_people_data AS c3
ON (c1.ssn = c3.ssn and
c1.fname = c3.fname and
c1.lname= c3.lname)
GO

distinct firstname, lastname and SSN table from the tu_people_data.
I created this table to increase the query performance.

CREATE TABLE [distFLS] (
[fname] [varchar] (32) COLLATE Latin1_General_CI_AS NULL ,
[lname] [varchar] (32) COLLATE Latin1_General_CI_AS NULL ,
[ssn] [int] NULL
) ON [PRIMARY]
GO

CREATE TABLE [TU_People_Data] (
[tu_id] [bigint] NOT NULL ,
[count_id] [int] NOT NULL ,
[fname] [varchar] (32) COLLATE Latin1_General_CI_AS NULL ,
[lname] [varchar] (32) COLLATE Latin1_General_CI_AS NULL ,
[ssn] [int] NULL ,
CONSTRAINT [PK_tu_bulk_people] PRIMARY KEY CLUSTERED
(
[tu_id],
[count_id]
) ON [PRIMARY]
) ON [PRIMARY]
GO

sample data
there is a column count_id after the tu_id and before fname(tu_id and
count_id are primary keys)
tu_id fname lname SSN
156078480 KRISINA WALSH 999999000
156078480 KRISTINA GIERER 999999000
156078480 KRISTINA WALSH 999999000
151257883 J SOTO 999999111
151257883 JOSE LARIOS 999999111
151257883 JOSE SOTO 999999111
151257883 L SOTO 999999111
136312525 ELADIO GARCIA 999999222
136312525 ELADIO NAVA 999999222
136312525 ELADIO NAVAGARCIA 999999222
136312525 GARCIA NAVA 999999222
149180940 DARREN SAUERWINE 999999333
149180940 DARREN SUAERWIN 999999333Back to basics. The most commn errors in numeric codes liek SSN are
1) missing digit
2) extra digit
3) one wrong digit
4) Pairwise transpose

For names, use Metaphone and write it in a better 3GL than T-SQL.|||i'm not a huge fan of the method of group number assignment. seems
pretty inefficient to do a row count every time.

Try this;
select distinct left(c1.fname,1) as fname, left(c1.lname,1) as lname,
c1.ssn into tmpgroups from tu_people_data

Using SQL, add a new column to tmpgroups which is an identity column
named tu_id

I'm a little puzzled on the business logic. It looks like the records
are identical if the ssn is the same, and the first letter of first
name OR first letter of last name is same. Is this what you want?|||you can add the identity in one shot
select distinct identity(int,1,1) as tu_id,left(c1.fname,1) as fname,
left(c1.lname,1) as lname,
c1.ssn into tmpgroups from tu_people_data

http://sqlservercode.blogspot.com/|||(jacob.dba@.gmail.com) writes:

> I am using the following query which I found from a fragmanet of code
> by itzik ben-gan to assign a common group id for group of records in my
> case which have similar SSN and first Name and Last Name. if the SSN is
> the same it should also check the first name and last name of the
> record. Becuase records have more than three AKA names, I need to check
> all the possibilities of first name last name combination to verify the
> records are the same.
> This code works fine and can assign group numbers for all the rows.
> I am trying this code on a database of 65,000 rows. It's taking around
> 20 minute to complete. but I'll have to run the same code on
> 800,000,000 rows.
> It will take years to finish.
> even if the query is optimized to run in 1 second for 65,000 rows, it
> will take more than 4 hours to run on the 800,000,000 row. This where I
> realized I am in the "wrong jungle".

I hope that the query is not going to be run in a regular fashion on
those 800 million rows, but once you are there, it will be a one-off.

For the problem as given it sounds like a nightmare to process 800
million rows.

> SELECT c1.fname, c1.lname, c1.ssn , c3.tu_id,
> (SELECT 1 + count(*)
> FROM distFLS AS c2
> WHERE c2.ssn < c1.ssn
> or (c2.ssn = c1.ssn and (substring(c2.fname,1,1) =
> substring(c1.fname,1,1) or substring(c2.lname,1,1) =
> substring(c1.lname,1,1)
> or substring(c2.fname,1,1) =
> substring(c1.lname,1,1) or substring(c2.lname,1,1) =
> substring(c1.fname,1,1))
> )) AS grp_num
> into tmp_FLS
> FROM distFLS AS c1
> JOIN tu_people_data AS c3
> ON (c1.ssn = c3.ssn and
> c1.fname = c3.fname and
> c1.lname= c3.lname)
> GO

Your definition of distFLS does not have an index, at least you did not
post one. A clustered index on ssn would be a good start. In the same
vein, add an index on (ssn, fnmae, lname) on TU_PeopleData.

That may at least speed up your test case on 65000 rows. Although, you
probably need more tweaks to do the 800 million.

--
Erland Sommarskog, SQL Server MVP, esquel@.sommarskog.se

Books Online for SQL Server 2005 at
http://www.microsoft.com/technet/pr...oads/books.mspx
Books Online for SQL Server 2000 at
http://www.microsoft.com/sql/prodin...ions/books.mspx|||I have a table with first name, last name, SSN and other columns.
I want to assign group number according to this business logic.
1. Records with equal SSN and (similar first name or last name) belong
to the same group.
John Smith 1234
Smith John 1234
S John 1234
J Smith 1234
John Smith and Smith John falls in the same group Number as long as
they have similar SSN.
This is because I have a record of equal SSN but the first name and
last name is switched because of people who make error inserting last
name as first name and vice versa. John Smith and Smith John will have
equal group Name if they have equal SSN.
2. There are records with equal SSN but different first name and last
name. These belong to different group numbers.
Equal SSN doesn't guarantee equal group number, at least one of the
first name or last name should be the same. John Smith and Dan Brown
with equal SSN=1234 shouldn't fall in the same group number.

Sample data:
Id Fname lname SSN grpNum
1 John Smith 1234 1
2 Smith John 1234 1
3 S John 1234 1
4 J Smith 1234 1
5 J S 1234 1
6 Dan Brown 1234 2
7 John Smith 1111 3

I have tried this code for 65,000 rows. It took 20 minute. I have to
run it for 21 million row data. It will take years.

INSERT into temp_FnLnSSN_grp
SELECT c1.fname, c1.lname, c1.ssn AS ssn, c3.tu_id,
(SELECT 1 + count(*)
FROM distFLS AS c2
WHERE c2.ssn < c1.ssn
or (c2.ssn = c1.ssn and (substring(c2.fname,1,1) =
substring(c1.fname,1,1) or substring(c2.lname,1,1) =
substring(c1.lname,1,1)
or substring(c2.fname,1,1) =
substring(c1.lname,1,1) or substring(c2.lname,1,1) =
substring(c1.fname,1,1))
)) AS group_number
FROM distFLS AS c1
JOIN tu_people_data AS c3
ON (c1.ssn = c3.ssn and
c1.fname = c3.fname and
c1.lname= c3.lname)

dist FLS is distinct First Name, last Name and SSN table from the
people table.

Doug wrote:
> i'm not a huge fan of the method of group number assignment. seems
> pretty inefficient to do a row count every time.
> Try this;
> select distinct left(c1.fname,1) as fname, left(c1.lname,1) as lname,
> c1.ssn into tmpgroups from tu_people_data
> Using SQL, add a new column to tmpgroups which is an identity column
> named tu_id
> I'm a little puzzled on the business logic. It looks like the records
> are identical if the ssn is the same, and the first letter of first
> name OR first letter of last name is same. Is this what you want?|||I have a table with first name, last name, SSN and other columns.
I want to assign group number according to this business logic.
1. Records with equal SSN and (similar first name or last name) belong
to the same group.
John Smith 1234
Smith John 1234
S John 1234
J Smith 1234
John Smith and Smith John falls in the same group Number as long as
they have similar SSN.
This is because I have a record of equal SSN but the first name and
last name is switched because of people who make error inserting last
name as first name and vice versa. John Smith and Smith John will have
equal group Name if they have equal SSN.
2. There are records with equal SSN but different first name and last
name. These belong to different group numbers.
Equal SSN doesn't guarantee equal group number, at least one of the
first name or last name should be the same. John Smith and Dan Brown
with equal SSN=1234 shouldn't fall in the same group number.

Sample data:
Id Fname lname SSN grpNum
1 John Smith 1234 1
2 Smith John 1234 1
3 S John 1234 1
4 J Smith 1234 1
5 J S 1234 1
6 Dan Brown 1234 2
7 John Smith 1111 3

I have tried this code for 65,000 rows. It took 20 minute. I have to
run it for 21 million row data. It will take years.

INSERT into temp_FnLnSSN_grp
SELECT c1.fname, c1.lname, c1.ssn AS ssn, c3.tu_id,
(SELECT 1 + count(*)
FROM distFLS AS c2
WHERE c2.ssn < c1.ssn
or (c2.ssn = c1.ssn and (substring(c2.fname,1,1) =
substring(c1.fname,1,1) or substring(c2.lname,1,1) =
substring(c1.lname,1,1)
or substring(c2.fname,1,1) =
substring(c1.lname,1,1) or substring(c2.lname,1,1) =
substring(c1.fname,1,1))
)) AS group_number
FROM distFLS AS c1
JOIN tu_people_data AS c3
ON (c1.ssn = c3.ssn and
c1.fname = c3.fname and
c1.lname= c3.lname)

dist FLS is distinct First Name, last Name and SSN table from the
people table.

Doug wrote:
> i'm not a huge fan of the method of group number assignment. seems
> pretty inefficient to do a row count every time.
> Try this;
> select distinct left(c1.fname,1) as fname, left(c1.lname,1) as lname,
> c1.ssn into tmpgroups from tu_people_data
> Using SQL, add a new column to tmpgroups which is an identity column
> named tu_id
> I'm a little puzzled on the business logic. It looks like the records
> are identical if the ssn is the same, and the first letter of first
> name OR first letter of last name is same. Is this what you want?

Iteration within Stored Procedure

A Stored Procedure inserts a record in a base table. I want to add n records (n=1 to 5) into a related table. Another SP (tdAuthorityInsert) is already set up to insert one record into the related table.

So, two questions
1. What is the form of an iterative loop in a Stored Procedure?
2. How do you call a Stored Procedure from inside another?

Thanks, td

1. while

2. just use exec your_stored_procecure_name

|||

Thanks KH. I'm afraid, though, I am very new & your help is a bit too cryptic for me. Sorry but I require a bit more.

In the interim I had figured out the EXEC (I presume this is an abbreviation of EXECUTE) but I have trouble with the parameters. The SP goes something like this:

...AS
@.RequestID BigInt
.....
EXEC InsertReviewer @.RequestID,@.RequestID,@.RequestDate,GETDATE()

The problem is that the SP doing the calling has a parameter of @.Request. So does the called SP. I want to pass the ID through with other parameters.

The WHILE, is it used with a BEGIN/END eg
WHILE @.NumReviewers<5
BEGIN

END

Thanks very much for your patience

td

|||Is this what you trying to do ?
declare @.NumReviewers int
-- Initialize the @.NumReviewers
select @.NumReviewers = 1
WHILE @.NumReviewers <= 5
BEGIN
-- execute your SP and pass in the @.NumReviewers
exec your_sp_name @.NumReviewers
-- increment the @.NumReviewers
select @.NumReviewers = @.NumReviewers + 1
END

Issue: How to convert a database field from varchar to datetime..?

Can anyone help me on this!
I've got more than a 1000 records in a SQL server database.
The problem is that the the date field is set to varchar, and that gives a lot of trouble. (for example by sorting a table, it's a mess)
How can i make sure that i will have a table with the date field set to datettime en that those 1000 records still will be in it.
thanks in advance!

You should be able to just convert them to datetime select cast(varDateField as dateTime) from yourTable. The only problem you will have is if you dont have date fields in any of the data.

Nick

Issue with the ForEachLoop Task in SSIS

Hi,

I am using a SQL task to execute a stored procedure which returns a single field with multiple records. I want the records returned by the stored procedure to be processed one by one within a ForEachLoop container. How do I assign the records one by one to one variable and use it in a Script task running inside the ForEachLoop container.

I am using 2 tasks in my package.

In my first task I call a SQL task that executes a stored procedure which returns a list of reference numbers (TrackData). This works perfectly.

However, in my second task I must use the ForEachLoop task to loop through the above list and set the value of var_TrackData (a user variable declared by me) with the value of the TrackData present in it during that particular loop.

I am not sure how to go about the second task. Any help would be greatly appreciated.

Create an object variable.

In the execute sql task set the resultset to the variable name (set result name to 0).

Create a variable to hold the reference numbers (int or string?)

Create a for each loop task

Set the collection to for each ADO enumerator

Set the ADO object source variable to your object variable name (which contains the resultset).

In variable mappings set the variable to the variable name you created to hold the reference numbers

Set the precednce so that the execute sql runs before the for each llop.

Now when this runs the object variable will be set to the resultset the the for each loop will itterate through it setting the variable to the reference number for each loop.

|||

See if this post gives you some idea of how you can do it:

http://rafael-salas.blogspot.com/2006/12/import-header-line-tables-into-dynamic_22.html