Failed to enable constraints One or more rows contain values violating non-null unique or foreign-key constraints

Question

I make an outer join and executed successfully in the informix database but I get the following exception in my code   DataTable dt   TeachingLoadDAL GetCoursesWithEvalState i  bat        Failed to enable constraints  One or more rows contain values   violating non-null  unique  or foreign-key constraints    I know the problem  but I don t know how to fix it   The second table I make the outer join on contains a composite primary key which are null in the previous outer join query   EDIT       SELECT UNIQUE a crs e   a crs e             a crst crs name  b period             b crscls  c crsday  c from lect  c to lect             c to lect - c from lect   1 Subtraction  c lect kind  e eval  e batch no             e crsnum  e lect code  e prof course     FROM rlm1course a  rfc14crsgrp b  ckj1table c  mnltablelectev d           OUTER cc1assiscrseval e        WHERE a crsnum   b crsnum      AND b crsnum   c crsnum      AND b crscls   c crscls      AND b batch no   c batch no      AND c serial key   d serial key       AND c crsnum   e crsnum       AND c batch no   e batch no       AND d lect code  e lect code      AND d lect code             AND b batch no          The problem happens with the table cc1assiscrseval  The primary key is  batch no  crsnum  lect code    How to fix this problem     EDIT   According to  PaulStock advice  I do what he said  and i get        dt GetErrors   0   System Data DataRow  HasErrors  true ItemArray     object 10   RowError   Column  eval  does not allow DBNull Value     So I solve my problem by replacing  e eval to  NVL  e eval     eval and this solves my problem  Thanks a lot

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Secondary way        If you don t need  id  to be as Primary key   Remove its primary key attribute   on your DataSet   TableAdapter   right click on  id  column   select Delete key      Problem will be fixed

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You can disable the constraints on the dataset  It will allow you to identify bad data and help resolve the issue   e g    dataset TableA Clear    dataset EnforceConstraints   false  dataAdapter1 daTableA Fill dataset  TableA      The fill method might be slightly different for you

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Thank you for all the input made so far  I just wanna add on that while one may have successfully normalized DB  updated any schema changes to their application  e g  to dataset  or so  there is also another cause  sql CARTESIAN product  when joining tables in queries     The existence of a cartesian query result will cause duplicate records in the primary  or key first  table of two or more tables being joined  Even if you specify a  Where  clause in the SQL  a Cartesian may still occur if JOIN with secondary table for example contains the unequal join  useful when to get data from 2 or more UNrelated tables       FROM         tbFirst INNER JOIN                         tbSystem ON tbFirst reference str  lt   tbSystem systemKey str   Solution for this      tables should be related   Thanks  chagbert

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It sounds like possibly one or more of the columns being selected with      e eval  e batch no  e crsnum  e lect code  e prof course   has AllowDBNull set to False in your Dataset defintion

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To fix this error  i took off the troubling table adapter from the Dataset designer  and saved the dataset  and then dragged a fresh copy of the table adapter from the server explorer and that fixed it

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I also had this issue and it was resolved after modifying the   xsd to reflect the revised size of the column changed in the underlying SQL server

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using  var tbl   new DataTable                using  var rdr   cmd ExecuteReader                                  tbl BeginLoadData                     try                                       tbl Load rdr                                     catch  ConstraintException ex                                        rdr Close                        tbl Clear                            clear constraints  source of exceptions                        note  column schema already loaded                      tbl Constraints Clear                        tbl Load cmd ExecuteReader                                       finally                                       tbl EndLoadData

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This error was also showing in my project  I tried all the proposed solutions posted here  but no luck at all because the problem had nothing to do with fields size  table key fields definition  constraints or the EnforceConstraints dataset variable   In my case I also have a  xsd object which I put there during the project design time  the Data Access Layer   As you drag your database table objects into the Dataset visual item  it reads each table definition from the underlying database and copies the constraints into the Dataset object exactly as you defined them when you created the tables in your database  SQL Server 2008 R2 in my case   This means that every table column created with the constraint of  not null  or  foreign key  must also be present in the result of your SQL statement or stored procedure   After I included all the key columns and the columns defined as  not null  into my queries the problem disappeared completely

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I solved the same problem by changing this from false to  true   in the end I went into the database and changed my bit field to allow null  and then refreshed my xsd  and refreshed my wsdl and reference cs  and now all is well   this columnAttachPDFToEmailFlag AllowDBNull   true

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This problem is usually caused by one of the following   null values being returned for columns not set to AllowDBNull duplicate rows being returned with the same primary key  a mismatch in column definition  e g  size of char fields  between the database and the dataset   Try running your query natively and look at the results  if the resultset is not too large  If you ve eliminated null values  then my guess is that the primary key columns is being duplicated   Or  to see the exact error  you can manually add a Try Catch block to the generated code like so and then breaking when the exception is raised     Then within the command window  call GetErrors method on the table getting the error  For C   the command would be   dataTable GetErrors   For VB  the command is   dataTable GetErrors    This will show you all datarows which have an error  You can get then look at the RowError for each of these  which should tell you the column that s invalid along with the problem  So  to see the error of the first datarow in error the command is    dataTable GetErrors 0  RowError or in C  it would be   dataTable GetErrors   0  RowError

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DirectCast dt Rows 0  DataRow  RowError  This directly gives the error

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I resolved this problem by opening the  xsd file with an XML reader and deleting a constraint placed on one of my views  For whatever reason when I added the view to the data it added a primary key constraint to one of the columns when there shouldn t have been one   The other way is to open the  xsd file normally  look at the table view causing the issue and delete any keys  right click column  select delete key  that should not be there

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The problem is with the Data Access designer   In Visual Studio  When we pull a View from  Server Explorer  to the Designer window  it is adding either a Primary key on a column randomly or marking something to a NOT NULL though it is actually set to null   Though the actual View creation in the SQL db server  doesn t have any primary key defined or the NOT NULL defined  the VS designer is adding this Key constraint   You can see this in the designer - it is shown with a key icon on left of the column name    Solution  Right click on the key icon and select  Delete Key    This should solve the problem   You can also right click on a column and select  Properties  to see the list of properties of a column in the VS Data access designer and change the values appropriately

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Just want to add another possible reason for the exception to those listed above  especially for people who like to define dataset schema manually     when in your dataset you have two tables  and there is a relationship  DataSet Reletions Add    defined from first table s field  chfield  to the second table s field  pfield   there is like an implicit constraint is added to that field to be unique even though it may be not specified as such explicitly in your definition neither as unique nor as a primary key   As a consequence  should you have rows with repetitive values in that parent field  pfield  you ll get this exception too

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Ensure the fields named in the table adapter query match those in the query you have defined  The DAL does not seem to like mismatches  This will typically happen to your sprocs and queries after you add a new field to a table   If you have changed the length of a varchar field in the database and the XML contained in the XSS file has not picked it up  find the field name and attribute definition in the XML and change it manually   Remove primary keys from select lists in table adapters if they are not related to the data being returned   Run your query in SQL Management Studio and ensure there are not duplicate records being returned  Duplicate records can generate duplicate primary keys which will cause this error   SQL unions can spell trouble  I modified one table adapter by adding a    please select an employee    record preceding the others  For the other fields I provided dummy data including  for example  strings of length one  The DAL inferred the schema from that initial record  Records following with strings of length 12 failed

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Short and easy Soloution    Go to MSSQL Studio Sever    Run the query of the cause of this error   in my case i see that id value was null because i forget to set Identity specification increment by 1     So entered 1 for the id field as its is autoincremane and modify dont allow NULLS in desing view    That was the error that caused my bindingsource and tabel adapter throwin error at this code      this exchangeCheckoutReportTableAdapter Fill this sbmsDataSet ExchangeCheckouReportTable

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I solved this problem by doing the  subselect  like it   string newQuery    select   from      query      as temp     When do it on mysql  all collunms properties  unique  non-null      will be cleared

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It is not clear why running a SELECT statement should involve enabling constraints   I don t know C  or related technologies  but I do know Informix database   There is something odd going on with the system if your querying code is enabling  and presumably also disabling  constraints   You should also avoid the old-fashioned  non-standard Informix OUTER join notation   Unless you are using an impossibly old version of Informix  you should be using the SQL-92 style of joins   Your question seems to mention two outer joins  but you only show one in the example query   That  too  is a bit puzzling   The joining conditions between  e  and the rest of the tables is   AND c crsnum   e crsnum   AND c batch no   e batch no   AND d lect code  e lect code    This is an unusual combination   Since we do not have the relevant subset of the schema with the relevant referential integrity constraints  it is hard to know whether this is correct or not  but it is a little unusual to join between 3 tables like that   None of this is a definitive answer to you problem  however  it may provide some guidance

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Mine started working when I set AllowDBNull to True on a date field on a data table in the xsd file

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In my case this error was provoked by a size of a string column  What was weird was when I executed the exact same query in different tool  repeated values nor null values weren t there   Then I discovered that the size of a string column size was 50 so when I called the fill method the value was chopped  throwing this exception  I click on the column and set in the properties the size to 200 and the error was gone    Hope this help

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This worked for me  source  here  I had this error and it wasn t related with the DB constrains  at least in my case   I have an  xsd file with a GetRecord query that returns a group of records  One of the columns of that table was  nvarchar 512   and in the middle of the project I needed to changed it to  nvarchar MAX     Everything worked fine until the user entered more than 512 on that field and we begin to get the famous error message  Failed to enable constraints  One or more rows contain values violating non-null  unique  or foreign-key constraints    Solution   Check all the MaxLength property of the columns in your DataTable   The column that I changed from  nvarchar 512   to  nvarchar MAX   still had the 512 value on the MaxLength property so I changed to  -1  and it works

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If you are using visual studio dataset designer to get the data table  and it is throwing an error  Failed to Enable constraints   I ve faced the same problem  try to preview the data from the dataset designer itself and match it with table inside your database    The best way to solve this issue is to delete the table adapter and create a new one instead

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I received the same error type and in my case it solved it by removing the select fields and replacing them with a    No idea why it was happening  The query had no typos or anything fancy   Not the best solution but nothing else worked and I was getting exhausted   In my search for a clear answer I found this on this   https   www codeproject com questions 45516 failed-to-enable-constraints-one-or-more-rows-cont  Solution 8  This error was also showing in my project  using Visual Studio 2010  I tried other solutions posted in other blogs  but no luck at all because the problem had nothing to do with fields size  table key fields definition  constraints or the EnforceConstraints dataset variable   In my case I have a  xsd object which I put there during the project design time  in the Data Access Layer   As you drag your database table objects into the Dataset visual item  it reads each table definition from the underlying database and copies the constraints into the Dataset object exactly as you defined them when you created the tables in your database  SQL Server 2008 R2 in my case   This means that every table column created with the constraint of  not null  or  foreign key  must also be present in the result of your SQL statement or stored procedure   After I included all the constrained columns  not null  primary key  foreign key  etc  into my queries the problem disappeared completely   Perhaps you don t need all the table columns to be present in the query stored procedure result  but because the constraints are still applied the error is shown if some constrained column does not appear in the result   Hope this helps someone else

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This will find all rows in the table that have errors  print out the row s primary key and the error that occurred on that row    This is in C   but converting it to VB should not be hard   foreach  DataRow dr in dataTable        if  dr HasErrors                 Debug Write  quot Row  quot            foreach  DataColumn dc in dataTable PKColumns            Debug Write dc ColumnName    quot     quot    dr ItemArray dc Ordinal     quot     quot            Debug WriteLine  quot  has error   quot    dr RowError               Oops - sorry PKColumns is something I added when I extended DataTable that tells me all the columns that make up the primary key of the DataTable   If you know the Primary Key columns in your datatable you can loop through them here   In my case  since all my datatables know their PK cols I can write debug for these errors automatically for all tables  The output looks like this  Row FIRST NAME   HOMER   LAST NAME   SIMPSON   MIDDLE NAME   J    has error  Column  HAIR COLOR  does not allow DBNull Value   If you re confused about the PKColumns section above - this prints out column names and values  and is not necessary  but adds helpful troubleshooting info for identifying which column values may be causing the issue  Removing this section and keeping the rest will still print the SQLite error being generated  which will note the column that has the problem

[c#] Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints

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