loop through all tables and delete records

Question

I\'m new to MsSql and I\'m not sure if this can be done but I figured I\'d ask before I want on my way with the current process..

I need to create a script that loops th

Answer 1

You could run a query like this:

SELECT 'DELETE FROM [' + s.name + '].[' + t.name + '] WHERE CorporationId = ''52D3AEFE-8EBD-4669-8096-4596FE83BB36'''
FROM sys.columns c
    inner join sys.tables t
        ON t.object_id= c.object_id
    inner join sys.schemas s
        ON s.schema_id = t.schema_id
where c.name = 'CorporationId'

and then either copy and paste the results into a new query window and execute the new query or iterate over the results with a cursor and execute each result with the exec statement.

Answer 2

Here's another one... could easily be changed to a stored procedure...

Declare @corpID Nvarchar(256)
Set     @corpID = 'xxx'

If      Object_ID('tempdb..#tables') Is Not Null Drop Table #tables
Create  Table #tables (tID Int, SchemaName Nvarchar(256), TableName Nvarchar(256))

Insert  #tables
Select  Row_Number() Over (Order By s.name, so.name), s.name, so.name
From    sysobjects so
Join    sys.schemas s
        On  so.uid = s.schema_id
Join    syscolumns sc
        On  so.id = sc.id
Where   so.xtype = 'u'
And     sc.name = 'CorporationId'

Declare @SQL Nvarchar(Max),
        @schema Nvarchar(256),
        @table Nvarchar(256),
        @iter Int = 1

While   Exists (Select  1
                From    #tables)
Begin

        Select  @schema = SchemaName,
                @table = TableName
        From    #tables
        Where   tID = @iter

        If      Exists (Select  1
                        From    sysobjects o
                        Join    sys.schemas s1
                                On  o.uid = s1.schema_id
                        Join    sysforeignkeys fk
                                On  o.id = fk.rkeyid
                        Join    sysobjects o2
                                On  fk.fkeyid = o2.id
                        Join    sys.schemas s2
                                On  o2.uid = s2.schema_id
                        Join    #tables t
                                On  o2.name = t.TableName Collate Database_Default
                                And s2.name = t.SchemaName Collate Database_Default
                        Where   o.name = @table
                        And     s1.name = @schema)
        Begin
                Update  t
                Set     tID = (Select Max(tID) From #tables) + 1
                From    #tables t
                Where   tableName = @table
                And     schemaName = @schema

                Set     @iter = @iter + 1
        End
        Else
        Begin
                Set     @Sql = 'Delete t
                                From    [' + @schema + '].[' + @table + '] t
                                Where   CorporationId = ''' + @corpID + ''''

                Exec    sp_executeSQL @SQL;

                Delete  t
                From    #tables t
                Where   tableName = @table
                And     schemaName = @schema

                Set     @iter = @iter + 1

        End
End

Answer 3

sp_MSForEachTable is an undocumented stored procedure which will run a command for each table in the database:

USE MyDatabase

DECLARE @CorporationId VARCHAR(50)
SET @CorporationId = '52D3AEFE-8EBD-4669-8096-4596FE83BB36'

DECLARE @Sql VARCHAR(MAX)
SET @Sql = '
IF COL_LENGTH(''?'',''CorporationId'') IS NOT NULL
BEGIN
    DELETE FROM Web.?
    WHERE CorporationId = ''' + @CorporationId + '''
END
'

EXEC sp_MSForEachTable @Sql

Answer 4

Here is a Sql Fiddle that proves the below query

You can get the tables from this query:

SELECT Name, IsChecked = 0
INTO #Tables
FROM sys.Tables
WHERE EXISTS
(
  SELECT * FROM sys.columns 
  WHERE object_id = OBJECT_ID(sys.Tables.Name) AND sys.columns.Name = 'blah'
) 

Then, you can create a dynamic query and execute it for the tables that you found

WHILE(SELECT COUNT(*) FROM #Tables WHERE IsChecked = 0) > 0
BEGIN
    SELECT TOP 1 @TableName = Name FROM #Tables WHERE IsChecked = 0
    SET     @DeleteQuery = 'DELETE FROM ' + @TableName  + ' WHERE CorporationID = ''' + @CorporationId + ''''
    EXECUTE sp_executeSQL @DeleteQuery;
    UPDATE #Tables SET IsChecked = 1 WHERE Name = @TableName 
END