Need To Delete A Table Which Has A Reference To Another Table
Dec 12, 2007
Hi Friends...
In general we cannot delete a table if it refers another table. But in the process of backup and restore, we need to delete all the tables, so we have return an asp.net function...
Dim Datatable As String
Dim ds As New DataSet
ds = gDatabase.ExecuteQuery(" select Table_Name from Information_schema.Tables where Table_type='TABLE'")
If ds.Tables.Count > 0 Then
If ds.Tables(0).Rows.Count > 0 Then
Dim dr As DataRow
Dim da As SqlCeDataAdapter
Dim Cmd As String
For Each dr In ds.Tables(0).Rows
Datatable = dr.Item("Table_name")
Cmd = "Delete from [" & Datatable & "]"
gDatabase.ExecuteNonQuery(Cmd)
Next
End If
End If
we got an error like
"Msg 4712, Level 16, State 1, Line 1
Cannot truncate table 'Electricalworks' because it is being referenced by a FOREIGN KEY constraint.
"
how to override these errors, if we have to delete all the tables. We have about 200 tables.
This function will generate all DELETE statements in correct order to perform a CASCADING delete. For self-joined tables, it will generate the T-SQL code to "unwind" the table, also in correct order!CREATE FUNCTION dbo.fnCascadingDelete ( @Schema NVARCHAR(128) = NULL, @Table NVARCHAR(128) = NULL ) RETURNS@Return TABLE ( RowID INT PRIMARY KEY CLUSTERED, IsSelfJoin TINYINT NOT NULL, HasPk TINYINT NOT NULL, [SQL] NVARCHAR(4000) NOT NULL ) AS BEGIN DECLARE@Constraints TABLE ( RowID INT NOT NULL, Indent SMALLINT NOT NULL, [Catalog] NVARCHAR(128) NOT NULL, [Schema] NVARCHAR(128) NOT NULL, [Table] NVARCHAR(128) NOT NULL, [Column] NVARCHAR(128), pkCatalog NVARCHAR(128), pkSchema NVARCHAR(128), pkTable NVARCHAR(128), pkColumn NVARCHAR(128), pkType NVARCHAR(128), pkSize INT, IsSelfJoin TINYINT NOT NULL, HasPk TINYINT NOT NULL )
INSERT@Constraints ( RowID, Indent, [Catalog], [Schema], [Table], [Column], pkCatalog, pkSchema, pkTable, pkColumn, pkType, pkSize, IsSelfJoin, HasPk ) SELECTRowID, Indent, [Catalog], [Schema], [Table], [Column], pkCatalog, pkSchema, pkTable, pkColumn, pkType, pkSize, SelfJoin, CASE WHEN [Column] IS NULL THEN 0 ELSE 1 END FROMdbo.fnTableTree(@Schema, @Table)
IF @@ROWCOUNT = 0 RETURN
DECLARE@SQL TABLE ( ID INT IDENTITY(1, 1), RowID INT PRIMARY KEY CLUSTERED, IsSelfJoin TINYINT NOT NULL, HasPk TINYINT NOT NULL, [SQL] NVARCHAR(4000) NOT NULL )
DECLARE@Unwind TABLE ( RowID INT NOT NULL, StepID INT IDENTITY(0, 1) PRIMARY KEY NONCLUSTERED, [SQL] NVARCHAR(4000) )
WHILE NOT EXISTS (SELECT * FROM @SQL WHERE RowID = 1) BEGIN SELECT TOP 1@RowID = c.RowID, @ID = c.RowID, @Indent = c.Indent, @TSQL = N'', @EndSQL = N'', @IsSelfJoin = c.IsSelfjoin, @HasPk = c.HasPk FROM@Constraints AS c LEFT JOIN@SQL AS s ON s.RowID = c.RowID WHEREs.RowID IS NULL ORDER BYc.Indent DESC, c.RowID DESC
WHILE @ID > 0 BEGIN IF @Indent = 0 SELECT@RowSQL = N'DELETE t' + CAST(@RowID AS NVARCHAR(12)), @RowSQL = @RowSQL + N' FROM ' + QUOTENAME(c.[Catalog]) + N'.' + QUOTENAME(c.[Schema]) + N'.' + QUOTENAME(c.[Table]) + N' AS t' + CAST(@ID AS NVARCHAR(12)), @EndSQL = N' WHERE t' + CAST(@ID AS NVARCHAR(12)) + '.' + QUOTENAME(COALESCE(c.[Column], '%0')) + N' = ''%1''', @IsSelfJoin = @IsSelfJoin | c.IsSelfJoin FROM@Constraints AS c WHEREc.RowID = @ID ELSE SELECT@RowSQL = N' INNER JOIN ' + QUOTENAME(c.[Catalog]) + N'.' + QUOTENAME(c.[Schema]) + N'.' + QUOTENAME(c.[Table]), @RowSQL = @RowSQL + N' AS t' + CAST(@ID AS NVARCHAR(12)) + N' ON t' + CAST(@ID AS NVARCHAR(12)) + N'.' + QUOTENAME(c.[Column]), @pkColumn = QUOTENAME(c.pkColumn), @IsSelfJoin = @IsSelfJoin | c.IsSelfJoin FROM@Constraints AS c WHEREc.RowID = @ID
SELECT TOP 1@ID = c.RowID, @Indent = c.Indent, @RowSQL = @RowSQL + N' = t' + CAST(c.RowID AS NVARCHAR(12)) + N'.' + @pkColumn, @IsSelfJoin = @IsSelfJoin | c.IsSelfJoin FROM@Constraints AS c WHEREc.RowID < @ID AND c.Indent < @Indent ORDER BYc.Indent DESC, c.RowID DESC
INSERT@Stage (Lvl, RowKey) SELECT@Lvl, t.' + QUOTENAME(@pkColumn) + ' FROM' + QUOTENAME(@Catalog) + '.' + QUOTENAME(@Schema) + '.' + QUOTENAME(@Table) + ' AS t INNER JOIN@Stage AS s ON s.RowKey = t.' + QUOTENAME(@Column) + ' AND s.Lvl = @Lvl - 1 LEFT JOIN@Stage AS cr ON cr.RowKey = t.' + QUOTENAME(@pkColumn) + ' WHEREcr.RowKey IS NULL END SELECT ''DELETE FROM ' + QUOTENAME(@Catalog) + '.' + QUOTENAME(@Schema) + '.' + QUOTENAME(@Table) + ' WHERE ' + QUOTENAME(@pkColumn) + ' = '' + QUOTENAME(RowKey, '''''''') FROM @Stage WHERE RowID > 0 ORDER BY RowID DESC'
INSERT@Unwind ( RowID, [SQL] ) VALUES( @RowID, @RowSQL ) END END
INSERT@Return ( RowID, IsSelfJoin, HasPk, [SQL] ) SELECTs.ID, s.IsSelfJoin, s.HasPk, CASE WHEN u.RowID IS NULL THEN s.[SQL] ELSE u.[SQL] END FROM@SQL AS s LEFT JOIN@Unwind AS u ON u.RowID = s.RowID ORDER BYs.ID, u.StepID
I am not sure if this is necessarily a simple question, but I'm somewhat new to SQL so I thought maybe there's an obvious answer I just don't know about.
The problem is that I have one "master" table, and a child table that has two foreign key references back to that master table. Both of these foreign key constraints are marked as "on delete cascade" with the intention that should a row from the master table be deleted, any rows that reference that object in EITHER foreign key field should be deleted.
I am wondering why this causes a cycle. It seems logical enough to me, it just involves two passes of the table, one for each affected column.
there are two tables involve in replication let say table1 and replicated table is also rep.table1.
we are not deleting records physically in table1 so only a bit in table1 has true when u want to delete a record but the strange thing is that replication agaent report that this is hard delete operation on table1 so download and report hard delete operation and delete the record in replicated table which is very crucial.
plz let me know where am i wrong and how i put it into right way.
there is no triggers on published tables and noother trigger is created on published table.
I have a requirement of table partitioning. we have 10 years of data on a table which is 30 billion up rows on 2005 server we are upgrading it to 2014. we have to keep 7 years of data. there is no keys on table or date column. since its a huge amount of data and many users its slow down the process speed. we are thinking to do partition on 7 years for Quarterly based. but as i said there is no date column on table we have to use reference table to get date. is there a way i can do the partitioning with out adding date column on table? also does partition will make query faster?Â
I have think three ways to do it. 1. leave as it is. 2. 7 years partition on one server 3. 3 years partition on server1 and 4 years partition on server2 (for 4 years is snapshot better?)
Hello,I have a query that I need help with.there are two tables...Product- ProductId- Property1- Property2- Property3PropertyType- PropertyTypeId- PropertyTypeThere many columns in (Product) that reverence 1 lookup table (PropertyType)In the table Product, the columns Property1, Property2, Property3 all contain a numerical value that references PropertyType.PropertyTypeIdHow do I select a Product so I get all rows from Product and also the PropertyType that corresponds to the Product.Property1, Product.Property2, and Product.Property3ProductId | Property1 | Property2 | Property3 | PropertyType1 | PropertyType2 | PropertyType3 PropertyType(1) = PropertyType for Property1PropertyType(2) = PropertyType for Property2PropertyType(3) = PropertyType for Property3I hope this makes sence.Thanks in advance.
--Table 1 "Employee" CREATE TABLE [MyCompany].[Employee]( [EmployeeGID] [int] IDENTITY(1,1) NOT NULL, [BranchFID] [int] NOT NULL, [FirstName] [varchar](50) NOT NULL, [MiddleName] [varchar](50) NOT NULL, [LastName] [varchar](50) NOT NULL, CONSTRAINT [PK_Employee] PRIMARY KEY CLUSTERED ( [EmployeeGID] ) GO ALTER TABLE [MyCompany].[Employee] WITH CHECK ADD CONSTRAINT [FK_Employee_BranchFID] FOREIGN KEY([BranchFID]) REFERENCES [myCompany].[Branch] ([BranchGID]) GO ALTER TABLE [MyCompany].[Employee] CHECK CONSTRAINT [FK_Employee_BranchFID]
-- Table 2 "Branch" CREATE TABLE [Mycompany].[Branch]( [BranchGID] [int] IDENTITY(1,1) NOT NULL, [BranchName] [varchar](50) NOT NULL, [City] [varchar](50) NOT NULL, [ManagerFID] [int] NOT NULL, CONSTRAINT [PK_Branch] PRIMARY KEY CLUSTERED ( [BranchGID] ) GO ALTER TABLE [MyCompany].[Branch] WITH CHECK ADD CONSTRAINT [FK_Branch_ManagerFID] FOREIGN KEY([ManagerFID]) REFERENCES [MyCompany].[Employee] ([EmployeeGID]) GO ALTER TABLE [MyCompany].[Branch] CHECK CONSTRAINT [FK_Branch_ManagerFID]
--Foreign IDs = FID --generated IDs = GID Then I try a simple single row DELETE
DELETE FROM MyCompany.Employee WHERE EmployeeGID= 39
Well this might look like a very basic error: I get this Error after trying to delete something from Table €œEmployee€?
The DELETE statement conflicted with the REFERENCE constraint "FK_Branch_ManagerFID". The conflict occurred in database "MyDatabase", table "myCompany.Branch", column 'ManagerFID'.
Yes what I€™ve been doing is to deactivate the foreign key constraint, in both tables when performing these kinds of operations, same thing if I try to delete a €œBranch€? entry, basically each entry in €œbranch€? and €œEmployee€? is child of each other which makes things more complicated.
My question is, is there a simple way to overcome this obstacle without having to deactivate the foreign key constraints every time or a good way to prevent this from happening in the first place? Is this when I have to use €œON DELETE CASCADE€? or something?
I have two tables that are related by keys. For instance,Table employee {last_name char(40) not null,first_name char(40) not null,department_name char(40) not null,age int not null,...}Employee table has a primary key (combination of last_name and first_name).Table address {last_name char(40) not null,first_name char(40) not null,street char(200) not null,city char(100) not null,...}Address table has a primary key (combination of last_name, first_name andstreet in which (last_name, first_name) reference (last_name, first_name) inemployee table.Now I want to delete some rows in Address table based on department_name inEmployee table. What is sql for this delete?I appreciate your help. Please ignore table design and I just use it for myproblem illustration.Jim
I need to delete records from a table (Table1) which has a foreign key column in a related table (Table2).
Table1 columns are: table1Id; Name. Table2 columns include Table2.table1Id which is the foreign key to Table1.
What is the syntax to delete records from Table1 using Table1.Name='some name' and remove any records in Table2 that have Table2.table1Id equal to Table1.table1Id?
I have contract table which has built in foreign key constrains. How can I alter this table for delete/ update cascade without recreating the table so whenever studentId/ contactId is modified, the change is effected to the contract table.
Thanks
************************************************** ****** Contract table DDL is
create table contract( contractNum int identity(1,1) primary key, contractDate smalldatetime not null, tuition money not null, studentId char(4) not null foreign key references student (studentId), contactId int not null foreign key references contact (contactId) );
I have one table that has unique id's associated with each row of information. I want to delete rows of information in one table that have a unique ID that references information in another table.
Here is a basic breakdown of what I am trying to do:
Table1 (the table where the rows need to be deleted from) Column_x (Holds the id that is unique to the various rows of data - User ID)
Table2 (Holds the user information & has the associated ID) Column_z (holds the User ID)
I tried this on a test set of tables and could not get it to work. What I am trying to do is skip all rows of Table1 that have ID's present in Table2, and delete the rows of ID's that are not present in Table2.
Code:
SELECT Column_z FROM dbo.Table2 DELETE FROM dbo.Table1 WHERE Column_z <> Column_x
This did not seem to do what I needed, it did not delete any rows at all.
I wanted it to delete all rows in Table1 that did not have a reference to a user ID that matched any ID's in Column_z of Table2
Then I tried another scenerio that I also needed to do:
Code:
SELECT Column_z, Column_a FROM dbo.Table2 DELETE FROM dbo.Table1 WHERE Column_z = Column_x AND Column_a='0'
'0' being the user id is inactive so I wanted to delete rows in Table1 and remove all references to users that were in an inactive status in Table2.
Neither one of the Queries wanted to work for me in the Query Analyzer when I ran them. It just said (0) rows affected.
with actividades_secundarias as ( select a.*, r.Antigo, r.Novo, rn = row_number() over (PARTITION BY a.nif_antigo, r.novo ORDER BY a.nif_antigo) from ACT_SECUNDARIAS a inner join ((select
[Code] ....
I want to make a delete statement like this:
select * into #table1 from actvidades_secundarias where rn>1 Delete from act_secundarias where act_secundarias.nif_antigo = #table1.nif_antigo and act_secundarias.cod_cae = #table1.cod_cae
A table was created in version 6.5 that has 2 blank spaces and a slash '/' in it's name (i.e. Item Type w/Groups). This was done in error and now the table cannot be dropped or renamed and dropped.
Does anyone know how I can delete this table? Please let me know.
which one is smarter, where there is no indexing on the table which is really simple table delete everything or recreate table. I got an argument with one of my coworker. He says it doesnt matter i say do delete. Any opinions.
SQLLY challenged be gentle --Trying to create code that will drop a table using a variable as theTable Name.DECLARE @testname as char(50)SELECT @testname = 'CO_Line_of_Business_' +SUBSTRING(CAST(CD_LAST_EOM_DATEAS varchar), 5, 2) + '_' + LEFT(CAST(CD_LAST_EOM_DATE AS varchar),4)+ '_' + 'EOM'FROM TableNamePrint @testname = 'blah...blah...blah' (which is the actual tablename on the server)How can I use this variable (@testname) to drop the table? Undersevere time constraints so any help would be greatly appreciated.
I am using web developer 2008, while connecting to I wanted to fetch data from Lotus notes database file, for this i used notesql connector, while connectiong to notes database i am fetting error
ERROR [42000] [Lotus][ODBC Lotus Notes]Table reference has to be a table name or an outer join escape clause in a FROM clause
I have already checked that database & table name are correct, please help me out How i can fetch the lotus notes data in my asp.net pages.
I am using web developer 2008, while connecting to I wanted to fetch data from Lotus notes database file, for this i used notesql connector, while connectiong to notes database i am fetting error
ERROR [42000] [Lotus][ODBC Lotus Notes]Table reference has to be a table name or an outer join escape clause in a FROM clause
I have already checked that database & table name are correct, please help me out How i can fetch the lotus notes data in my asp.net pages.
Background: Am working on completing an ORM that can not only handles CRUD actions -- but that can also updates the structure of a table transparently when the class defs change. Reason for this is that I can't get the SQL scripts that would work for updating a software on SqlServer to be portable to other DBMS systems. Doing it by code, rather than SQL batch has a chance of making cross-platform, updateable, software...
Anyway, because it needs to be cross-DBMS capable, the constraints are that the system used must work for the lowest common denominator....ie, a 'recipe' of steps that will work on all DBMS's.
The Problem: There might be simpler ways to do this with SqlServer (all ears :-) - just in case I can't make it cross platform right now) but, with simplistic DBMS's (SqlLite, etc) there is no way to ALTER table once formed: one has to COPY the Table to a new TMP name, adding a Column in the process, then delete the original, then rename the TMP to the original name.
This appears possible in SqlServer too --...as long as there are no CASCADE operations. Truncate table doesn't seem to be the solution, nor drop, as they all seem to trigger a Cascade delete in the Foreign Table.
So -- please correct me if I am wrong here -- it appears that the operations would be along the lines of: a) Remove the Foreign Key references b) Copy the table structure, and make a new temp table, adding the column c) Copy the data over d) Add the FK relations, that used to be in the first table, to the new table e) Delete the original f) Done?
The questions are: a) How does one alter a table to REMOVE the Foreign Key References part, if it has no 'name'. b) Anyone know of a good clean way to get, and save these constraints to reapply them to the new table. Hopefully with some cross platform ADO.NET solution? GetSchema etc appears to me to be very dbms dependant? c) ANY and all tips on things I might run into later that I have not mentioned, are also greatly appreciated.
I'm trying to clean up a database design and I'm in a situation to where two tables need a FK but since it didn't exist before there are orphaned records.
Tables are:
Brokers and it's PK is BID
The 2nd table is Broker_Rates which also has a BID table.
I'm trying to figure out a t-sql statement that will parse through all the recrods in the Broker_Rates table and delete the record if there isn't a match for the BID record in the brokers table.
I know this isn't correct syntax but should hopefully clear up what I'm asking
Given a UDT, is there any way to get a reference to the table where the specific instance is running ?
IE: Let's suppose we have defined a UDT named UDTPoint; now we define two tables: ATable & BTable, wich both have one column that is defined as UDTPoint.
When an insert/update/delete operation on ATable or BTable occurs, the UDTPoint class needs to verify in which context it is running (ATable or BTable) before doing operations on data.
The table above is my users table. It allows for a user to be at multiple sites or multiple locations within a single site or multiple sites. Would it be wise to use a auto incrementing primary key instead of the 3 column composite key? The reason I ask is because if I am referencing this SU table (which I will be a lot), a lot more data would be replicated to the tables which have the foreign key to this table, right? But if I used a single incrementing column as the primary key, only a small integer would be used as the foreign key, saving space?Does this make sense?
I have 2 databases in sql server. let us say database1 = db1 and database2 = db2 Now both the databases have a same table called table1 with the same fields.
IF data in db1.table1 is updated then data in db2.table2 should be updated automatically.
There are many ways we can do this. one way is to create a INSERT trigger on db1.table1.
But i would like to avoid trigger Is there something in SQL server where I can just link table1 of db1 to db2 and delete the table1 in db2. That means db2 is using the same table that of db1.
I am new to this site and I hope anyone out there can help me. I was tasked to change the constraints of my existing table. Lets call it table1. This table has an attribute that needs to take the value of another attribute of another table ( let's call it tables2) and that attribute must satisfy a certain expression ( I suppose I can isolate it by using the select statement ).
I would like to know if it's possible in MS SQL to redirect a table into another DB instance? I have no access into the source code and I have been wondering if it is possible to make a redirection/hard link in MS SQL side.
I would have a table in my base DB and when a query is made into this table, the MS SQL would redirect it to another DB or table. Is this possible in MS SQL ? Something along the lines of a hard-link in linux. Thank you very much.
The requirement is: I should allow single row delete from a table but not bulk delete. An audit table should get updated if there is any single delete or single update. So I wrote the triggers as follows: for single and bulk delete
ALTER TRIGGER [dbo].[TRG_Delete_Bulk_tbl_attendance] ON [dbo].[tbl_attendance] AFTER DELETE AS
[code]...
When I try to run the website, the database error I am getting is:Transaction count after EXECUTE indicates that a COMMIT or ROLLBACK TRANSACTION statement is missing. Previous count = 0, current count = 1.
lets say i have 100 employees on Table A and I have 10 employees on Table B. I want to delete all the employees in Table A that are in Table B. Delete From TableA Where EmpNum = (Select EmpNum From TableB)The above SQL wont work but i am looking for something similar. any ideas?
I have two tables; Table A id, name 101, jones 102, smith 103, williams 104, johnson 105, brown 106, green 107, anderson
Table B id, name, city, state
101, jones, des moine, Idaho 103, williams, Corvallis, Oregon 104, johnson, Grand Forks, North Dakota 105, brown, Phoenix, Arizona 107, anderson, New York, New York
I need to delete records from Table A that are not in Table B. My front end is writen in .net and I am using Data Access Layer along with a Business Logic Layer for data interaction.
I have tried at least seven variations of joining, right outer join, left outer join resulting in wiping our the entire table or nothing at all; not to mention deleting the record that ought to remain and keeping the record that needs to be deleted!
In my BLL I tried to capture the rowsAffected for the deletion by using-without success.
Dim rowsAffected As Integer = Adapter.ID_Deletion(ID)
Hi All, The problem is about cross reference. 1. I have a third party cross reference store procedure SimpleXTab CREATE PROCEDURE [dbo].[SimpleXTab2] @XField varChar(50), @XTable varChar(100),@XWhereString varChar(250), @XFunction varChar(10), @XFunctionField varChar(50), @XRow varchar(300),@ResultTable varchar(100) ASDeclare @SqlStr nvarchar(4000)Declare @tempsql nvarchar(4000)Declare @SqlStrCur nvarchar(4000)Declare @col nvarchar(100) set @SqlStrCur = N'Select [' + @XField + '] into ##temptbl_Cursor from [' + @XTable + '] ' + @XWhereString + ' Group By [' + @XField + ']' /* select @sqlstrcur */exec sp_executesql @sqlstrcur
declare xcursor Cursor for Select * from ##temptbl_Cursor open xcursor Fetch next from xcursor into @Col While @@Fetch_Status = 0Begin set @Sqlstr = @Sqlstr + ", " set @tempsql = isnull(@sqlstr,'') + isnull(@XFunction + '( Case When ' + @XField + " = '" +@Col + "' then [" + @XFunctionField + "] Else 0 End) As [" + @Col + "]" ,'') set @Sqlstr = @tempsql Fetch next from xcursor into @Col End /* Select @Sqlstr as [mk], len(@sqlstr) as [leng] */ set @tempsql = 'Select ' + @XRow + ', ' + @Sqlstr + 'into ' +@ResultTable+' From ' + @XTable + @XWhereString + ' Group by ' + @XRowprint @tempsql set @Sqlstr = @tempsql Close xcursor Deallocate xcursor set @tempsql = N'Drop Table ##temptbl_Cursor' exec sp_executesql @tempsqlprint @tempsql /* Select @Sqlstr as [mk], len(@sqlstr) as [leng] */print @sqlstr exec sp_executesql @Sqlstr if @@rowcount = 0 select 'No Records found'GO 2. I've use this store procedure for many cross reference successfully. But this time my cross reference value (resultcode) is a varchar which cannot be convert to int or decimal in sql, Probably, you've noticed that the fourth parameter is a function. how can i modify SimpleXtab to avoid using math function but still can generate cross reference. exec simplextab2 'Sequence','##tbltempreport',' ','sum','resultcode','Parameter' ,'dbo.resultcodetable'
