Getting MAX Value of a Field for INSERT Statement - sql

I am trying to insert a new record in a small settings table and I would like to get the MAX value of the DisplayOrder field and add 10 to it. I get errors with the MAX function in the value of the insert.
INSERT INTO tMrMenu
([ParentId]
,[DisplayOrder]
,[ItemName]
,[ItemDescription]
,[ItemURL]
,[ItemImage]
,[CreateDate]
,[CreateUser]
,[LastUpdateDate]
,[LastUpdateUser]
,[module]
,[isactive])
SELECT
( 1
, (SELECT MAX(DisplayOrder) + 10 FROM tMrMenu)
, 'EDM Summary Text'
, 'EDM Summary Text'
, '/Offline/Reports/EdmSummaryText'
, 'cli.gif'
, GETDATE()
, 'Garry.Bargsley'
, GETDATE()
, 'Garry.Bargsley'
, 'MR'
, 1)


You have extra parenthesis:
INSERT INTO tMrMenu
([ParentId]
,[DisplayOrder]
,[ItemName]
,[ItemDescription]
,[ItemURL]
,[ItemImage]
,[CreateDate]
,[CreateUser]
,[LastUpdateDate]
,[LastUpdateUser]
,[module]
,[isactive])
SELECT
1
, (SELECT MAX(DisplayOrder) + 10 FROM tMrMenu)
, 'EDM Summary Text'
, 'EDM Summary Text'
, '/Offline/Reports/EdmSummaryText'
, 'cli.gif'
, GETDATE()
, 'Garry.Bargsley'
, GETDATE()
, 'Garry.Bargsley'
, 'MR'
, 1


Declare #max int
SET #max = (SELECT MAX...)
INSERT INTO tMrMenu...
SELECT
...
#max,
...


INSERT INTO tMrMenu
([ParentId]
,[DisplayOrder]
,[ItemName]
,[ItemDescription]
,[ItemURL]
,[ItemImage]
,[CreateDate]
,[CreateUser]
,[LastUpdateDate]
,[LastUpdateUser]
,[module]
,[isactive])
SELECT MAX(DisplayOrder) + 10
, 'EDM Summary Text'
, 'EDM Summary Text'
, '/Offline/Reports/EdmSummaryText'
, 'cli.gif'
, GETDATE()
, 'Garry.Bargsley'
, GETDATE()
, 'Garry.Bargsley'
, 'MR'
, 1
FROM tMrMenu

Related

Having Trouble with FOR XML Path - No Concatenating

I have a situation where an order can contain multiple license purchases - and if the order does contain multiple licenses, I want to display the license descriptions in a single cell with the values separated by commas. If we were on SQL 2017, I could use STRING_AGG but we are on SQL 2016 so I am trying the tried and true STUFF / FOR XML Path method.
From the screenshot below, Customer 4341073 had two license purchases on Order ID 18519173:
When I add the STUFF / FOR XML Path to the T-SQL, I am not able to achieve the desired result of showing the license description in the same record - each license still has it's own row.
SELECT x.CustomerID ,
x.ATOLicenseTypeID ,
x.ATOLicense ,
x.AuthorizationBeginDate ,
x.AuthorizationEndDate ,
x.OrderID ,
x.OrderDate ,
STUFF ( (
SELECT ',' + lt.description
FROM dbo.LicenseTypes AS lt
--INNER JOIN #XMLPATH ON lt.id = x.OrderLicenseTypeID
WHERE lt.id = x.OrderLicenseTypeID
--GROUP BY ',' + lt.description
FOR XML PATH ( '' )
) , 1 , 1 , '' ) AS Licenses
FROM #XMLPATH AS x
--GROUP BY x.CustomerID ,
-- x.ATOLicenseTypeID ,
-- x.ATOLicense ,
-- x.AuthorizationBeginDate ,
-- x.AuthorizationEndDate ,
-- x.OrderID ,
-- x.OrderDate ,
-- x.OrderLicenseTypeID;
I've tried different ways to join the sub-query to the outer query and added and removed GROUP BY to achieve the desired result but nothing is working for me.
Any suggestions on where I am going wrong with this query?
Sample dataset:
DROP TABLE IF EXISTS #XMLPATH;
CREATE TABLE #XMLPATH
(
CustomerID INT ,
ATOLicenseTypeID INT ,
ATOLicense VARCHAR (500) ,
AuthorizationBeginDate DATE ,
AuthorizationEndDate DATE ,
OrderID INT ,
OrderDate DATETIME ,
OrderLicenseTypeID INT
);
INSERT INTO #XMLPATH
VALUES ( 4341073, 52, 'Temporary Resident Fishing', N'2019-01-07T00:00:00', N'2019-01-07T00:00:00', 18519136, N'2019-01-07T12:01:55.317', 2141 ) ,
( 4341073, 52, 'Temporary Resident Fishing', N'2019-01-07T00:00:00', N'2019-01-07T00:00:00', 18519173, N'2019-01-07T12:34:13.107', 204 ) ,
( 4341073, 52, 'Temporary Resident Fishing', N'2019-01-07T00:00:00', N'2019-01-07T00:00:00', 18519173, N'2019-01-07T12:34:13.107', 2141 );
SELECT * FROM #XMLPATH;
SELECT x.CustomerID ,
x.ATOLicenseTypeID ,
x.ATOLicense ,
x.AuthorizationBeginDate ,
x.AuthorizationEndDate ,
x.OrderID ,
x.OrderDate ,
STUFF ( (
SELECT ',' + lt.description
FROM dbo.LicenseTypes AS lt
--INNER JOIN #XMLPATH ON lt.id = x.OrderLicenseTypeID
WHERE lt.id = x.OrderLicenseTypeID
--GROUP BY ',' + lt.description
FOR XML PATH ( '' )
) , 1 , 1 , '' ) AS Licenses
FROM #XMLPATH AS x
GROUP BY x.CustomerID ,
x.ATOLicenseTypeID ,
x.ATOLicense ,
x.AuthorizationBeginDate ,
x.AuthorizationEndDate ,
x.OrderID ,
x.OrderDate ,
x.OrderLicenseTypeID;

In order to get all rows of one OrderID as one result-row, you must not include the separating information (the OrderLicenseTypeID) into the GROUP BY. But then you have the issue you've encountered: You cannot use this ID within your FOR XML construct.
The trick is (as your out-commented trials show), to add the source table to the sub-select and filter there with a grouped column. But you have to use different aliases to deal with them as two different sets. Try this:
(I had to add one more temp table to test this...)
SELECT x.CustomerID ,
x.ATOLicenseTypeID ,
x.ATOLicense ,
x.AuthorizationBeginDate ,
x.AuthorizationEndDate ,
x.OrderID ,
x.OrderDate ,
STUFF ( (
SELECT ',' + lt.description
FROM #XMLPATH x2
INNER JOIN #LicenseTypes AS lt ON lt.id=x2.OrderLicenseTypeID
WHERE x2.OrderID = x.OrderID --you might need to add more columns here....
--in most cases we want to add an ORDER BY
FOR XML PATH ( '' )
) , 1 , 1 , '' ) AS Licenses
FROM #XMLPATH AS x
GROUP BY x.CustomerID ,
x.ATOLicenseTypeID ,
x.ATOLicense ,
x.AuthorizationBeginDate ,
x.AuthorizationEndDate ,
x.OrderID ,
x.OrderDate;
Btw: Starting with v2017 there is STRING_AGG(), which makes this much easier...

SQL Pivot Issue

If you could please help with this. The code generates an error:
Msg 8156, Level 16, State 1, Line 236
The column 'Classification_Value_Id' was specified multiple times for 'piv1'.
I am doing this on SQL Server. The steps for the code is as follows:
1. Unpivot the data from the source table DB.[dbo].[Classification] into one column
2. Join this unpivoted data to a table called DB.dbo.[Classification_Value] to return/add the column 'cv.Classification_Name' to the data set
3. Pivot this dataset (This is the part returning the error)
CODE:
SELECT
activityCode
, actjvPartnerRef
, actMonth
, actSalesChannel
, addCBPCharge
, agentId
, appType
, areaCode
--SELECT
--polRef,[Arrangement_Id],UnpivotedData.Classification_Value_Id,UnpivotedData.Classification_Scheme_Id,ColValues, ColNames,cv.Classification_Name
FROM
(
SELECT top 10
[polRef]
, [Arrangement_Id]
, [Classification_Scheme_Id]
, [Classification_Value_Id]
-- ,[Arrangement_Classification_Type_Id]
-- ,[Effective_TimeStamp]
-- ,[End_date]
, CAST((ISNULL([character_measure],'')) AS NVARCHAR(MAX)) AS character_measure
, CAST((ISNULL([datetime_measure],'')) AS NVARCHAR(MAX)) AS datetime_measure
, CAST([decimal_measure] AS NVARCHAR(MAX)) AS decimal_measure
, CAST((ISNULL([integer_measure],'')) AS NVARCHAR(MAX)) AS integer_measure
, CAST((ISNULL([logical_measure],'')) AS NVARCHAR(MAX)) AS logical_measure
, CAST((ISNULL([charmax_measure],'')) AS NVARCHAR(MAX)) AS charmax_measure
, CAST((ISNULL([long_measure],'')) AS NVARCHAR(MAX)) AS long_measure
FROM DB.[dbo].[Classification]
) AS SrcDataConverted
UNPIVOT
(
ColValues FOR ColNames IN
(
character_measure
, datetime_measure
, decimal_measure
, integer_measure
, logical_measure
, charmax_measure
, long_measure
)
) AS UnpivotedData
LEFT JOIN DB.dbo.[Classification_Value] cv
ON cv.[Classification_Scheme_Id] = UnpivotedData.[Classification_Scheme_Id]
AND cv.Classification_Value_Id = UnpivotedData.Classification_Value_Id
PIVOT
(MAX(ColValues) for Classification_Name in (
activityCode
, actjvPartnerRef
, actMonth
, actSalesChannel
, addCBPCharge
, agentId
, appType
, areaCode
)) AS piv1;
Any help would be much appreciated
Thank you

StuarLC:
An additional derived table needs to wrap the results of the UNPIVOT before commencing the re-PIVOT, as the join introduces a duplicated Classification_Value_Id and Classification_Scheme_id, which is needed for the join.
select
activityCode
, actjvPartnerRef
, actMonth
, actSalesChannel
, addCBPCharge
, agentId
, appType
, areaCode
from (
SELECT polRef
, [Arrangement_Id]
, UnpivotedData.Classification_Value_Id
, UnpivotedData.Classification_Scheme_Id
, ColValues
, ColNames
, Classification_Name
FROM (
SELECT [polRef]
, [Arrangement_Id]
, [Classification_Scheme_Id]
, [Classification_Value_Id]
, CAST((ISNULL([character_measure],'')) AS NVARCHAR(MAX)) AS character_measure
, CAST((ISNULL([datetime_measure],'')) AS NVARCHAR(MAX)) AS datetime_measure
, CAST([decimal_measure] AS NVARCHAR(MAX)) AS decimal_measure
, CAST((ISNULL([integer_measure],'')) AS NVARCHAR(MAX)) AS integer_measure
, CAST((ISNULL([logical_measure],'')) AS NVARCHAR(MAX)) AS logical_measure
, CAST((ISNULL([charmax_measure],'')) AS NVARCHAR(MAX)) AS charmax_measure
, CAST((ISNULL([long_measure],'')) AS NVARCHAR(MAX)) AS long_measure
FROM DB.[dbo].[Classification]
) AS SrcDataConverted
UNPIVOT
(
ColValues FOR ColNames IN
(
character_measure
, datetime_measure
, decimal_measure
, integer_measure
, logical_measure
, charmax_measure
, long_measure
)
) AS UnpivotedData
LEFT JOIN
DB.dbo.[Classification_Value] cv
ON cv.[Classification_Scheme_Id] = UnpivotedData.[Classification_Scheme_Id]
AND cv.Classification_Value_Id = UnpivotedData.Classification_Value_Id
) as src
PIVOT
(
MAX(ColValues) for Classification_Name in (
activityCode
, actjvPartnerRef
, actMonth
, actSalesChannel
, addCBPCharge
, agentId
, appType
, areaCode
)
) AS piv1;

SQL divide by zero error encountered

I'm having an issue debugging my SQL code to find out why I'm producing a "divide by zero error encountered". I believe that this error occurs when trying to divide by a null value and using NULLIF as I understand is a way to prevent this. I have been unsuccessful in my attempts and could use some extra eyes on my code. SQL Server database
SET NOCOUNT ON;
SELECT CAST(yr AS INT) AS yr ,
CAST(rs.RTRIM(D.bus_name) AS VARCHAR(100)) AS bus_name ,
CAST(rs.RTRIM(D.bus_code) AS VARCHAR(20)) AS bus_code ,
SUM(CAST(D.salary AS NUMERIC(18, 2))) AS bus_salary ,
SUM(D.total_assign) AS total_assignment
FROM (
--begin: table:D
SELECT C.bus_code ,
C.bus_name ,
C.sales_issue_id ,
SUM(CAST(C.salary AS NUMERIC(18, 2))) AS salary ,
MAX(total_fte) AS total_fte ,
SUM(C.assigned_fte) AS total_assign ,
MAX(total_salary) AS total_salary ,
C.yr
FROM (
--begin: table C:
SELECT B.sales_issue_id ,
B.last_name ,
B.firs.t_name ,
B.bus_code ,
B.bus_name ,
B.total_salary ,
B.assigned_fte ,
( B.total_salary * B.assigned_fte )
/ total_fte AS salary ,
B.total_fte ,
B.yr
FROM --table B:
(
--begin B:
SELECT tb_total_fte_salary.sales_issue_id ,
rs.bus_name ,
tb_total_fte_salary.total_fte ,
rs.region_code
+ rs.county_code
+ rs.bus_code AS bus_code ,
rs.last_name ,
rs.first_name ,
tb_total_fte_salary.total_salary ,
assigned_fte = CASE rs.assign_fte
WHEN '' THEN 0
ELSE CAST(rs.assign_fte AS NUMERIC(18,
2))
END ,
rs.yr
FROM dbo.raw_sales AS rs,
(
SELECT sales_issue_id ,
yr ,
MAX(last_name) AS last_name ,
MAX(first_name) AS first_name ,
SUM(CAST(assign_fte AS NUMERIC(18,
2))) AS total_fte ,
MAX(CAST(NULLIF(total_salary,
0) AS NUMERIC(18,
2))) AS total_salary
FROM raw_sales
GROUP BY sales_issue_id ,
yr
--end
) tb_total_fte_salary
WHERE rs.sales_issue_id = tb_total_fte_salary.sales_issue_id
AND rs.yr = tb_total_fte_salary.yr
--end B:
) B
--end C:
) C
GROUP BY C.sales_issue_id ,
C.last_name ,
first_name ,
C.bus_name ,
C.bus_code ,
C.yr
--end D:
) D
GROUP BY bus_code ,
bus_name ,
yr
ORDER BY yr ,
bus_code ,
bus_name

try :
SET NOCOUNT ON;
SELECT CAST(yr AS INT) AS yr ,
CAST(rs.RTRIM(D.bus_name) AS VARCHAR(100)) AS bus_name ,
CAST(rs.RTRIM(D.bus_code) AS VARCHAR(20)) AS bus_code ,
SUM(CAST(D.salary AS NUMERIC(18, 2))) AS bus_salary ,
SUM(D.total_assign) AS total_assignment
FROM (
--begin: table:D
SELECT C.bus_code ,
C.bus_name ,
C.sales_issue_id ,
SUM(CAST(C.salary AS NUMERIC(18, 2))) AS salary ,
MAX(total_fte) AS total_fte ,
SUM(C.assigned_fte) AS total_assign ,
MAX(total_salary) AS total_salary ,
C.yr
FROM (
--begin: table C:
SELECT B.sales_issue_id ,
B.last_name ,
B.firs.t_name ,
B.bus_code ,
B.bus_name ,
B.total_salary ,
B.assigned_fte ,
-- this is where i changed your query
case when total_fte > 0 then
( B.total_salary * B.assigned_fte )
/ total_fte
else 0 end
AS salary ,
B.total_fte ,
B.yr
FROM --table B:
(
--begin B:
SELECT tb_total_fte_salary.sales_issue_id ,
rs.bus_name ,
tb_total_fte_salary.total_fte ,
rs.region_code
+ rs.county_code
+ rs.bus_code AS bus_code ,
rs.last_name ,
rs.first_name ,
tb_total_fte_salary.total_salary ,
assigned_fte = CASE rs.assign_fte
WHEN '' THEN 0
ELSE CAST(rs.assign_fte AS NUMERIC(18,
2))
END ,
rs.yr
FROM dbo.raw_sales AS rs,
(
SELECT sales_issue_id ,
yr ,
MAX(last_name) AS last_name ,
MAX(first_name) AS first_name ,
SUM(CAST(assign_fte AS NUMERIC(18,
2))) AS total_fte ,
MAX(CAST(NULLIF(total_salary,
0) AS NUMERIC(18,
2))) AS total_salary
FROM raw_sales
GROUP BY sales_issue_id ,
yr
--end
) tb_total_fte_salary
WHERE rs.sales_issue_id = tb_total_fte_salary.sales_issue_id
AND rs.yr = tb_total_fte_salary.yr
--end B:
) B
--end C:
) C
GROUP BY C.sales_issue_id ,
C.last_name ,
first_name ,
C.bus_name ,
C.bus_code ,
C.yr
--end D:
) D
GROUP BY bus_code ,
bus_name ,
yr
ORDER BY yr ,
bus_code ,
bus_name

Incorrect syntax near ')' on the last parenthesis when changing from openquery to a subquery on a local database

Why does this query return "Incorrect syntax near ')' " on the last parenthesis when changing from openquery to a subquery on a local database?
You can see the commented lines where the openquery started before (and worked)
select right(rtrim(a.vouchernumber),9) as voucherkey
, a.vouchernumber
, vendorkey
, rtrim(invoicenumber) as invoicenumber
, invoicedate
, duedate
, documenttype
, PostDate
, qty
, amt =
CASE
WHEN documenttype = 'D' THEN -(amt)
WHEN b.transactiontype = 'V' THEN -(amt)
ELSE
amt
End
, extendedlineamt
, intercompanyid
, acct
, NaturalAcct
, c.segmentdescription as NaturalAcctDesc
, Dept
, f.segmentdescription as DeptDesc
, Site
, d.segmentdescription as SiteDesc
, Project
, e.segmentdescription as ProjDesc
, b.*
, rtrim(vendorname) as vendorname
, rtrim(vendoraddress1) as vendoraddress1
, vendoraddress2
, vendoraddress3
, vendorcity
, rtrim(vendorstate) as vendorstate
, rtrim(vendorzipcode) as vendorzipcode
, rtrim(vendoraddress1) + ' ' + rtrim(vendoraddress2) +' ' + rtrim(vendorcity) + ', ' + rtrim(vendorstate) as VendorAddress
, Dept + '.' + Site + '.' + Project as ProjectId
--from openquery (LinkedServer,
-- 'select a.vouchernumber
from (
select a.vouchernumber
, a.vendorkey
, a.invoicenumber
, a.invoicedate
, a.duedate
, a.documenttype
, a.recdate as PostDate
, b.qty
, b.amt
, b.extendedlineamt
, b.intercompanyid
, b.acct
, Substring(Acct, 1, 4) as NaturalAcct
, Substring(Acct,8, 3 ) as Site
, Substring(Acct,11, 4 ) as Project
, Substring(Acct,5,3) as Dept
, v.vendorname
, v.vendoraddress1
, v.vendoraddress2
, v.vendoraddress3
, v.vendorcity
, v.vendorstate
, v.vendorzipcode
from aphdr a
join aplin b
on a.vouchernumber = b.vouchernumber
left join apvend v
on a.vendorkey = v.vendorkey
where a.recdate between '2011-01-01' and '2012-10-02'
and cast(Substring(Acct,11, 4 ) as varchar(4)) like 'VIR'
and left(a.vouchernumber,1) <> 'G'
and Company = 'ASSFD'
)

You need to alias your subquery.
put a alias name at the end of your query.

You need to give the subquery an alias (or name).
here i've just added tbl1 to the very end
select right(rtrim(a.vouchernumber),9) as voucherkey
, a.vouchernumber
, vendorkey
, rtrim(invoicenumber) as invoicenumber
, invoicedate
, duedate
, documenttype
, PostDate
, qty
, amt =
CASE
WHEN documenttype = 'D' THEN -(amt)
WHEN b.transactiontype = 'V' THEN -(amt)
ELSE
amt
End
, extendedlineamt
, intercompanyid
, acct
, NaturalAcct
, c.segmentdescription as NaturalAcctDesc
, Dept
, f.segmentdescription as DeptDesc
, Site
, d.segmentdescription as SiteDesc
, Project
, e.segmentdescription as ProjDesc
, b.*
, rtrim(vendorname) as vendorname
, rtrim(vendoraddress1) as vendoraddress1
, vendoraddress2
, vendoraddress3
, vendorcity
, rtrim(vendorstate) as vendorstate
, rtrim(vendorzipcode) as vendorzipcode
, rtrim(vendoraddress1) + ' ' + rtrim(vendoraddress2) +' ' + rtrim(vendorcity) + ', ' + rtrim(vendorstate) as VendorAddress
, Dept + '.' + Site + '.' + Project as ProjectId
--from openquery (LinkedServer,
-- 'select a.vouchernumber
from (
select a.vouchernumber
, a.vendorkey
, a.invoicenumber
, a.invoicedate
, a.duedate
, a.documenttype
, a.recdate as PostDate
, b.qty
, b.amt
, b.extendedlineamt
, b.intercompanyid
, b.acct
, Substring(Acct, 1, 4) as NaturalAcct
, Substring(Acct,8, 3 ) as Site
, Substring(Acct,11, 4 ) as Project
, Substring(Acct,5,3) as Dept
, v.vendorname
, v.vendoraddress1
, v.vendoraddress2
, v.vendoraddress3
, v.vendorcity
, v.vendorstate
, v.vendorzipcode
from aphdr a
join aplin b
on a.vouchernumber = b.vouchernumber
left join apvend v
on a.vendorkey = v.vendorkey
where a.recdate between '2011-01-01' and '2012-10-02'
and cast(Substring(Acct,11, 4 ) as varchar(4)) like 'VIR'
and left(a.vouchernumber,1) <> 'G'
and Company = 'ASSFD'
) tbl1

Get every row of duplicates within a table

I have code that grabs the duplicates in a SQL table and groups them by tracking number. I want to see EVERY row that duplicates, not just have them group. The code for getting the group of duplicates is below:
Select
CarrierID
, Mode
, TrackingNumber
, PickupID
, Reference1
, Reference2
, Quantity
, BilledWeight
, ActualWeight
, Zone
, ServiceLevel
, PickupDate
, SenderCompany
, SenderAddress
, SenderCity
, SenderState
, SenderZip
, ReceiverCompany
, ReceiverAddress
, ReceiverCity
, ReceiverState
, ReceiverZip
, FreightCharge
, Fuel
, Accessories
, TotalCharges
, WrongName
, WrongCompany
, WrongAddress
, WrongCity
, WrongState
, WrongZip
, WrongCountry
, CorrectedName
, CorrectedCompany
, CorrectedAddress
, CorrectedCity
, CorrectedState
, CorrectedZip
, CorrectedCountry
, Count(TrackingNumber) as TrackingNumberTotal
, Count(TotalCharges) as NumberofDuplicates
from Prasco_GencoShipments
group by
TrackingNumber
, TotalCharges
, CarrierID
, Mode
, TrackingNumber
, PickupID
, Reference1
, Reference2
, Quantity
, BilledWeight
, ActualWeight
, Zone
, ServiceLevel
, PickupDate
, SenderCompany
, SenderAddress
, SenderCity
, SenderState
, SenderZip
, ReceiverCompany
, ReceiverAddress
, ReceiverCity
, ReceiverState
, ReceiverZip
, FreightCharge
, Fuel
, Accessories
, TotalCharges
, WrongName
, WrongCompany
, WrongAddress
, WrongCity
, WrongState
, WrongZip
, WrongCountry
, CorrectedName
, CorrectedCompany
, CorrectedAddress
, CorrectedCity
, CorrectedState
, CorrectedZip
, CorrectedCountry
having (count(TrackingNumber) > 1 and (count(TotalCharges) > 1))

If CTEs are available (could also be done with a subselect):
WITH dups AS (
SELECT TrackingNumber, TotalCharges
FROM Prasco_GencoShipments
GROUP BY TrackingNumber, TotalCharges
HAVING COUNT(*) > 1
)
SELECT ta.*
FROM Prasco_GencoShipments ta
JOIN dups du ON du.TrackingNumber = ta.TrackingNumber AND du.TotalCharges = ta.TotalCharges
ORDER BY
TrackingNumber
, TotalCharges
;

Find duplicates for field1 ( and field2 , commented):
SELECT t1.*
FROM test t1
INNER JOIN test t2
ON t2.field1 = t1.field1 -- AND t2.field2 = t1.field2
WHERE t1.id <> t2.id
SQLFiddle