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sql query to return differences between two tables

I am trying to compare two tables, SQL Server, to verify some data. I want to return all the rows from both tables where data is either in one or the other. In essence, I want to show all the discrepancies. I need to check three pieces of data in doing so, FirstName, LastName and Product.

I'm fairly new to SQL and it seems like a lot of the solutions I'm finding are over complicating things. I don't have to worry about NULLs.

I started by trying something like this:

SELECT DISTINCT [First Name], [Last Name], [Product Name] FROM [Temp Test Data]
WHERE ([First Name] NOT IN (SELECT [First Name] 
FROM [Real Data]))

I'm having trouble taking this further though.

Thanks!

EDIT:

Based on the answer by @treaschf I have been trying to use a variation of the following query:

SELECT td.[First Name], td.[Last Name], td.[Product Name]
FROM [Temp Test Data] td FULL OUTER JOIN [Data] AS d 
ON td.[First Name] = d.[First Name] AND td.[Last Name] = d.[Last Name] 
WHERE (d.[First Name] = NULL) AND (d.[Last Name] = NULL)

But I keep getting 0 results back, when I know that there is at least 1 row in td that is not in d.

EDIT:

Ok, I think I figured it out. At least in my few minutes of testing it seems to work good enough.

SELECT [First Name], [Last Name]
FROM [Temp Test Data] AS td
WHERE (NOT EXISTS
        (SELECT [First Name], [Last Name]
         FROM [Data] AS d
         WHERE ([First Name] = td.[First Name]) OR ([Last Name] = td.[Last Name])))

This is basically going to tell me what is in my test data that is not in my real data. Which is completely fine for what I need to do.

like image 600
Casey Avatar asked Jan 16 '10 15:01

Casey


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12 Answers

(   SELECT * FROM table1
    EXCEPT
    SELECT * FROM table2)  
UNION ALL
(   SELECT * FROM table2
    EXCEPT
    SELECT * FROM table1) 
like image 113
erikkallen Avatar answered Oct 22 '22 08:10

erikkallen


IF you have tables A and B, both with colum C, here are the records, which are present in table A but not in B:

SELECT A.*
FROM A
    LEFT JOIN B ON (A.C = B.C)
WHERE B.C IS NULL

To get all the differences with a single query, a full join must be used, like this:

SELECT A.*, B.*
FROM A
    FULL JOIN B ON (A.C = B.C)
WHERE A.C IS NULL OR B.C IS NULL

What you need to know in this case is, that when a record can be found in A, but not in B, than the columns which come from B will be NULL, and similarly for those, which are present in B and not in A, the columns from A will be null.

like image 38
treaschf Avatar answered Oct 22 '22 09:10

treaschf


I know that this may not be a popular answer but I do agree with @Randy Minder on using third party tool when more complex comparison is needed.

This specific case here is easy and for this case such tools are not needed but this can get complex easily if you introduce more columns, databases on two servers, more complex comparison criteria and such.

There are a lot of these tools such as ApexSQL Data Diff or Quest Toad and you can always use them in trial mode to get the job done.

like image 31
Maisie John Avatar answered Oct 22 '22 10:10

Maisie John


To get all the differences between two tables, you can use like me this SQL request :

SELECT 'TABLE1-ONLY' AS SRC, T1.*
FROM (
      SELECT * FROM Table1
      EXCEPT
      SELECT * FROM Table2
      ) AS T1
UNION ALL
SELECT 'TABLE2-ONLY' AS SRC, T2.*
FROM (
      SELECT * FROM Table2
      EXCEPT
      SELECT * FROM Table1
      ) AS T2
;
like image 44
bilelovitch Avatar answered Oct 22 '22 10:10

bilelovitch


Simple variation on @erikkallen answer that shows which table the row is present in:

(   SELECT 'table1' as source, * FROM table1
    EXCEPT
    SELECT * FROM table2)  
UNION ALL
(   SELECT 'table2' as source, * FROM table2
    EXCEPT
    SELECT * FROM table1) 

If you get an error

All queries combined using a UNION, INTERSECT or EXCEPT operator must have an equal number of expressions in their target lists.

then it may help to add

(   SELECT 'table1' as source, * FROM table1
    EXCEPT
    SELECT 'table1' as source, * FROM table2)  
UNION ALL
(   SELECT 'table2' as source, * FROM table2
    EXCEPT
    SELECT 'table2' as source, * FROM table1) 
like image 34
studgeek Avatar answered Oct 22 '22 08:10

studgeek


If you want to get which column values are different, you could use Entity-Attribute-Value model:

declare @Data1 xml, @Data2 xml

select @Data1 = 
(
    select * 
    from (select * from Test1 except select * from Test2) as a
    for xml raw('Data')
)

select @Data2 = 
(
    select * 
    from (select * from Test2 except select * from Test1) as a
    for xml raw('Data')
)

;with CTE1 as (
    select
        T.C.value('../@ID', 'bigint') as ID,
        T.C.value('local-name(.)', 'nvarchar(128)') as Name,
        T.C.value('.', 'nvarchar(max)') as Value
    from @Data1.nodes('Data/@*') as T(C)    
), CTE2 as (
    select
        T.C.value('../@ID', 'bigint') as ID,
        T.C.value('local-name(.)', 'nvarchar(128)') as Name,
        T.C.value('.', 'nvarchar(max)') as Value
    from @Data2.nodes('Data/@*') as T(C)     
)
select
    isnull(C1.ID, C2.ID) as ID, isnull(C1.Name, C2.Name) as Name, C1.Value as Value1, C2.Value as Value2
from CTE1 as C1
    full outer join CTE2 as C2 on C2.ID = C1.ID and C2.Name = C1.Name
where
not
(
    C1.Value is null and C2.Value is null or
    C1.Value is not null and C2.Value is not null and C1.Value = C2.Value
)

SQL FIDDLE EXAMPLE

like image 44
Roman Pekar Avatar answered Oct 22 '22 08:10

Roman Pekar


Try this :

SELECT 
    [First Name], [Last Name]
FROM 
    [Temp Test Data] AS td EXCEPTION JOIN [Data] AS d ON 
         (d.[First Name] = td.[First Name] OR d.[Last Name] = td.[Last Name])

Much simpler to read.

like image 37
Kango_V Avatar answered Oct 22 '22 08:10

Kango_V


Presenting the Cadillac of Diffs as an SP. See within for the basic template that was based on answer by @erikkallen. It supports

  • Duplicate row sensing (most other answers here do not)
  • Sort results by argument
  • Limit to specific columns
  • Ignore columns (e.g. ModifiedUtc)
  • Cross database tables names
  • Temp tables (use as workaround to diff views)

Usage:

exec Common.usp_DiffTableRows '#t1', '#t2';

exec Common.usp_DiffTableRows 
    @pTable0          = 'ydb.ysh.table1',
    @pTable1          = 'xdb.xsh.table2',
    @pOrderByCsvOpt   = null,  -- Order the results
    @pOnlyCsvOpt      = null,  -- Only compare these columns
    @pIgnoreCsvOpt    = null;  -- Ignore these columns (ignored if @pOnlyCsvOpt is specified)

Code:

alter proc [Common].[usp_DiffTableRows]    
    @pTable0          varchar(300),
    @pTable1          varchar(300),
    @pOrderByCsvOpt   nvarchar(1000) = null,  -- Order the Results
    @pOnlyCsvOpt      nvarchar(4000) = null,  -- Only compare these columns
    @pIgnoreCsvOpt    nvarchar(4000) = null,  -- Ignore these columns (ignored if @pOnlyCsvOpt is specified)
    @pDebug           bit = 0
as
/*---------------------------------------------------------------------------------------------------------------------
    Purpose:  Compare rows between two tables.

      Usage:  exec Common.usp_DiffTableRows '#a', '#b';

    Modified    By          Description
    ----------  ----------  -------------------------------------------------------------------------------------------
    2015.10.06  crokusek    Initial Version
    2019.03.13  crokusek    Added @pOrderByCsvOpt
    2019.06.26  crokusek    Support for @pIgnoreCsvOpt, @pOnlyCsvOpt.    
    2019.09.04  crokusek    Minor debugging improvement
    2020.03.12  crokusek    Detect duplicate rows in either source table
  ---------------------------------------------------------------------------------------------------------------------*/
begin try

    if (substring(@pTable0, 1, 1) = '#')
        set @pTable0 = 'tempdb..' + @pTable0; -- object_id test below needs full names for temp tables

    if (substring(@pTable1, 1, 1) = '#')
        set @pTable1 = 'tempdb..' + @pTable1; -- object_id test below needs full names for temp tables

    if (object_id(@pTable0) is null)
        raiserror('Table name is not recognized: ''%s''', 16, 1, @pTable0);

    if (object_id(@pTable1) is null)
        raiserror('Table name is not recognized: ''%s''', 16, 1, @pTable1);

    create table #ColumnGathering
    (
        Name nvarchar(300) not null,
        Sequence int not null,
        TableArg tinyint not null
    );

    declare
        @usp          varchar(100) = object_name(@@procid),    
        @sql          nvarchar(4000),
        @sqlTemplate  nvarchar(4000) = 
        '  
            use $database$;

            insert into #ColumnGathering
            select Name, column_id as Sequence, $TableArg$ as TableArg
              from sys.columns c
             where object_id = object_id(''$table$'', ''U'')
        ';          

    set @sql = replace(replace(replace(@sqlTemplate,
        '$TableArg$', 0),
        '$database$', (select DatabaseName from Common.ufn_SplitDbIdentifier(@pTable0))),
        '$table$', @pTable0);

    if (@pDebug = 1)
        print 'Sql #CG 0: ' + @sql;

    exec sp_executesql @sql;

    set @sql = replace(replace(replace(@sqlTemplate,
        '$TableArg$', 1),
        '$database$', (select DatabaseName from Common.ufn_SplitDbIdentifier(@pTable1))),
        '$table$', @pTable1);

    if (@pDebug = 1)
        print 'Sql #CG 1: ' + @sql;

    exec sp_executesql @sql;

    if (@pDebug = 1)
        select * from #ColumnGathering;

    select Name, 
           min(Sequence) as Sequence, 
           convert(bit, iif(min(TableArg) = 0, 1, 0)) as InTable0,
           convert(bit, iif(max(TableArg) = 1, 1, 0)) as InTable1
      into #Columns
      from #ColumnGathering
     group by Name
    having (     @pOnlyCsvOpt is not null 
             and Name in (select Value from Common.ufn_UsvToNVarcharKeyTable(@pOnlyCsvOpt, default)))
        or 
           (     @pOnlyCsvOpt is null
             and @pIgnoreCsvOpt is not null 
             and Name not in (select Value from Common.ufn_UsvToNVarcharKeyTable(@pIgnoreCsvOpt, default)))
        or 
           (     @pOnlyCsvOpt is null
             and @pIgnoreCsvOpt is null)

    if (exists (select 1 from #Columns where InTable0 = 0 or InTable1 = 0))
    begin
        select 1; -- without this the debugging info doesn't stream sometimes
        select * from #Columns order by Sequence;        
        waitfor delay '00:00:02';  -- give results chance to stream before raising exception
        raiserror('Columns are not equal between tables, consider using args @pIgnoreCsvOpt, @pOnlyCsvOpt.  See Result Sets for details.', 16, 1);    
    end

    if (@pDebug = 1)
        select * from #Columns order by Sequence;

    declare 
        @columns nvarchar(4000) = --iif(@pOnlyCsvOpt is null and @pIgnoreCsvOpt is null,
           -- '*',     
            (
              select substring((select ',' + ac.name
                from #Columns ac
               order by Sequence
                 for xml path('')),2,200000) as csv
            );

    if (@pDebug = 1)
    begin
        print 'Columns: ' + @columns;
        waitfor delay '00:00:02';  -- give results chance to stream before possibly raising exception
    end

    -- Based on https://stackoverflow.com/a/2077929/538763
    --     - Added sensing for duplicate rows
    --     - Added reporting of source table location
    --
    set @sqlTemplate = '
            with 
               a as (select ~, Row_Number() over (partition by ~ order by (select null)) -1 as Duplicates from $a$), 
               b as (select ~, Row_Number() over (partition by ~ order by (select null)) -1 as Duplicates from $b$)
            select 0 as SourceTable, ~
              from 
                 (
                   select * from a
                   except
                   select * from b
                 )  anb
              union all
             select 1 as SourceTable, ~
               from 
                 (
                   select * from b
                   except
                   select * from a
                 )  bna
             order by $orderBy$
        ';    

     set @sql = replace(replace(replace(replace(@sqlTemplate, 
            '$a$', @pTable0), 
            '$b$', @pTable1),
            '~', @columns),
            '$orderBy$', coalesce(@pOrderByCsvOpt, @columns + ', SourceTable')
        );

     if (@pDebug = 1)
        print 'Sql: ' + @sql;

     exec sp_executesql @sql;

end try
begin catch
    declare        
        @CatchingUsp  varchar(100) = object_name(@@procid);    

    if (xact_state() = -1)
        rollback;    

    -- Disabled for S.O. post

    --exec Common.usp_Log
        --@pMethod = @CatchingUsp;

    --exec Common.usp_RethrowError        
        --@pCatchingMethod = @CatchingUsp;

    throw;
end catch
go

create function Common.Trim
(
    @pOriginalString nvarchar(max), 
    @pCharsToTrim nvarchar(50) = null -- specify null or 'default' for whitespae 
)  
returns table
with schemabinding
as 
/*--------------------------------------------------------------------------------------------------
    Purpose:   Trim the specified characters from a string.

    Modified    By              Description
    ----------  --------------  --------------------------------------------------------------------
    2012.09.25  S.Rutszy/crok   Modified from https://dba.stackexchange.com/a/133044/9415    
  --------------------------------------------------------------------------------------------------*/ 
return
with cte AS
(
  select patindex(N'%[^' + EffCharsToTrim + N']%', @pOriginalString) AS [FirstChar],
         patindex(N'%[^' + EffCharsToTrim + N']%', reverse(@pOriginalString)) AS [LastChar],
         len(@pOriginalString + N'~') - 1 AS [ActualLength]
   from
   (
         select EffCharsToTrim = coalesce(@pCharsToTrim, nchar(0x09) + nchar(0x20) + nchar(0x0d) + nchar(0x0a))
   ) c
)
select substring(@pOriginalString, [FirstChar],
                 ((cte.[ActualLength] - [LastChar]) - [FirstChar] + 2)
       ) AS [TrimmedString]
       --
       --cte.[ActualLength],
       --[FirstChar],
       --((cte.[ActualLength] - [LastChar]) + 1) AS [LastChar]              
from cte;
go

create function [Common].[ufn_UsvToNVarcharKeyTable] (
    @pCsvList     nvarchar(MAX),
    @pSeparator   nvarchar(1) = ','       -- can pass keyword 'default' when calling using ()'s
    )    
    --
    -- SQL Server 2012 distinguishes nvarchar keys up to maximum of 450 in length (900 bytes)
    -- 
    returns @tbl table (Value nvarchar(450) not null primary key(Value)) as
/*-------------------------------------------------------------------------------------------------
    Purpose:  Converts a comma separated list of strings into a sql NVarchar table.  From

              http://www.programmingado.net/a-398/SQL-Server-parsing-CSV-into-table.aspx     

              This may be called from RunSelectQuery:

                  GRANT SELECT ON Common.ufn_UsvToNVarcharTable TO MachCloudDynamicSql;

    Modified    By              Description
    ----------  --------------  -------------------------------------------------------------------
    2011.07.13  internet        Initial version
    2011.11.22  crokusek        Support nvarchar strings and a custom separator.
    2017.12.06  crokusek        Trim leading and trailing whitespace from each element.
    2019.01.26  crokusek        Remove newlines
  -------------------------------------------------------------------------------------------------*/     
begin
    declare 
        @pos      int,
        @textpos  int,
        @chunklen smallint,
        @str      nvarchar(4000),
        @tmpstr   nvarchar(4000),
        @leftover nvarchar(4000),
        @csvList nvarchar(max) = iif(@pSeparator not in (char(13), char(10), char(13) + char(10)),
            replace(replace(@pCsvList, char(13), ''), char(10), ''),
            @pCsvList); -- remove newlines

    set @textpos = 1
    set @leftover = ''  
    while @textpos <= len(@csvList)
    begin
        set @chunklen = 4000 - len(@leftover)
        set @tmpstr = ltrim(@leftover + substring(@csvList, @textpos, @chunklen))
        set @textpos = @textpos + @chunklen

        set @pos = charindex(@pSeparator, @tmpstr)
        while @pos > 0
        begin
            set @str = substring(@tmpstr, 1, @pos - 1)
            set @str = (select TrimmedString from Common.Trim(@str, default));
            insert @tbl (value) values(@str);
            set @tmpstr = ltrim(substring(@tmpstr, @pos + 1, len(@tmpstr)))
            set @pos = charindex(@pSeparator, @tmpstr)
        end

        set @leftover = @tmpstr
    end

    -- Handle @leftover

    set @str = (select TrimmedString from Common.Trim(@leftover, default));

    if @str <> ''
       insert @tbl (value) values(@str);

    return
end
GO

create function Common.ufn_SplitDbIdentifier(@pIdentifier nvarchar(300))
returns @table table 
(    
    InstanceName          nvarchar(300) not null,
    DatabaseName          nvarchar(300) not null,
    SchemaName            nvarchar(300),
    BaseName              nvarchar(300) not null,
    FullTempDbBaseName    nvarchar(300),            -- non-null for tempdb (e.g. #Abc____...)
    InstanceWasSpecified  bit not null,
    DatabaseWasSpecified  bit not null,
    SchemaWasSpecified    bit not null,
    IsCurrentInstance     bit not null,
    IsCurrentDatabase     bit not null,
    IsTempDb              bit not null,
    OrgIdentifier         nvarchar(300) not null
) as
/*-----------------------------------------------------------------------------------------------------------
    Purpose:  Split a Sql Server Identifier into its parts, providing appropriate default values and
              handling temp table (tempdb) references.

    Example:  select * from Common.ufn_SplitDbIdentifier('t')
              union all
              select * from Common.ufn_SplitDbIdentifier('s.t')
              union all
              select * from Common.ufn_SplitDbIdentifier('d.s.t')
              union all
              select * from Common.ufn_SplitDbIdentifier('i.d.s.t')
              union all
              select * from Common.ufn_SplitDbIdentifier('#d')
              union all
              select * from Common.ufn_SplitDbIdentifier('tempdb..#d'); 

              -- Empty
              select * from Common.ufn_SplitDbIdentifier('illegal name'); 

    Modified    By              Description
    ----------  --------------  -----------------------------------------------------------------------------
    2013.09.27  crokusek        Initial version.  
  -----------------------------------------------------------------------------------------------------------*/
begin
    declare 
        @name nvarchar(300) = ltrim(rtrim(@pIdentifier));

    -- Return an empty table as a "throw"
    --
    --Removed for SO post
    --if (Common.ufn_IsSpacelessLiteralIdentifier(@name) = 0)
      --  return;

    -- Find dots starting from the right by reversing first.

    declare 
        @revName nvarchar(300) = reverse(@name);

    declare
        @firstDot int = charindex('.', @revName);

    declare
        @secondDot  int = iif(@firstDot = 0,  0, charindex('.', @revName, @firstDot + 1));

    declare
        @thirdDot   int = iif(@secondDot = 0, 0, charindex('.', @revName, @secondDot + 1));

    declare
        @fourthDot  int = iif(@thirdDot = 0, 0, charindex('.', @revName, @thirdDot + 1));

    --select @firstDot, @secondDot, @thirdDot, @fourthDot, len(@name);

    -- Undo the reverse() (first dot is first from the right).
    --
    set @firstDot = iif(@firstDot = 0, 0, len(@name) - @firstDot + 1);
    set @secondDot = iif(@secondDot = 0, 0, len(@name) - @secondDot + 1);
    set @thirdDot = iif(@thirdDot = 0, 0, len(@name) - @thirdDot + 1);
    set @fourthDot = iif(@fourthDot = 0, 0, len(@name) - @fourthDot + 1);

    --select @firstDot, @secondDot, @thirdDot, @fourthDot, len(@name);

    declare
        @baseName   nvarchar(300)  = substring(@name, @firstDot + 1, len(@name) - @firstdot);

    declare
        @schemaName nvarchar(300) = iif(@firstDot - @secondDot - 1 <= 0, 
                                        null,
                                        substring(@name, @secondDot + 1, @firstDot - @secondDot - 1));
    declare
        @dbName     nvarchar(300) = iif(@secondDot - @thirdDot - 1 <= 0, 
                                        null,
                                        substring(@name, @thirdDot + 1, @secondDot - @thirdDot - 1));
    declare
        @instName   nvarchar(300) = iif(@thirdDot - @fourthDot - 1 <= 0, 
                                        null, 
                                        substring(@name, @fourthDot + 1, @thirdDot - @fourthDot - 1));

    with input as (
        select
           coalesce(@instName, '[' + @@servername + ']') as InstanceName,
           coalesce(@dbName,     iif(left(@baseName, 1) = '#', 'tempdb', db_name())) as DatabaseName,
           coalesce(@schemaName, iif(left(@baseName, 1) = '#', 'dbo', schema_name())) as SchemaName,
           @baseName as BaseName,
           iif(left(@baseName, 1) = '#',
               (
                  select [name] from tempdb.sys.objects
                  where object_id = object_id('tempdb..' + @baseName)
               ), 
               null) as FullTempDbBaseName,                
           iif(@instName is null, 0, 1) InstanceWasSpecified,       
           iif(@dbName is null, 0, 1) DatabaseWasSpecified,
           iif(@schemaName is null, 0, 1) SchemaWasSpecified    
     )
     insert into @table           
     select i.InstanceName, i.DatabaseName, i.SchemaName, i.BaseName, i.FullTempDbBaseName,
            i.InstanceWasSpecified, i.DatabaseWasSpecified, i.SchemaWasSpecified,
            iif(i.InstanceName = '[' + @@servername + ']', 1, 0) as IsCurrentInstance,
            iif(i.DatabaseName = db_name(), 1, 0) as IsCurrentDatabase,
            iif(left(@baseName, 1) = '#', 1, 0) as IsTempDb,
            @name as OrgIdentifier
       from input i;

    return;
end
GO
like image 24
crokusek Avatar answered Oct 22 '22 09:10

crokusek


You can use except , for example something like this :

-- DB1..Tb1 have values than DB2..Tb1 not have
Select Col1,Col2,Col3 From DB1..Tb1
except
Select Col1,Col2,Col3 From DB2..Tb1
-- Now we change order
-- DB2..Tb1 have values than DB1..Tb1 not have
Select Col1,Col2,Col3 From DB2..Tb1
except
Select Col1,Col2,Col3 From DB1..Tb1
like image 27
GiovaniSalazar Avatar answered Oct 22 '22 10:10

GiovaniSalazar


This will do the trick, similar with Tiago's solution, return "source" table as well.

select [First name], [Last name], max(_tabloc) as _tabloc
from (
  select [First Name], [Last name], 't1' as _tabloc from table1
  union all
  select [First name], [Last name], 't2' as _tabloc from table2
) v
group by [Fist Name], [Last name]
having count(1)=1

result will contain differences between tables, in column _tabloc you will have table reference.

like image 39
Adrian-Bogdan Ionescu Avatar answered Oct 22 '22 09:10

Adrian-Bogdan Ionescu


For a simple smoke test where you you're trying to ensure two tables match w/out worrying about column names:

--ensure tables have matching records
Select count (*) from tbl_A
Select count (*) from tbl_B

--create temp table of all records in both tables
Select * into #demo from tbl_A 
Union All
Select * from tbl_B

--Distinct #demo records = Total #demo records/2 = Total tbl_A records = total tbl_B records
Select distinct * from #demo 

You can easily write a store procedure to compare a batch of tables.

like image 31
thomas398 Avatar answered Oct 22 '22 10:10

thomas398


There is a performance issue related with the left join as well as full join with large data.

In my opinion this is the best solution:

select [First Name], count(1) e from
(select * from [Temp Test Data]
 union all
 select * from [Temp Test Data 2]) a
group by [First Name] having e = 1
like image 44
Tiago Moutinho Avatar answered Oct 22 '22 09:10

Tiago Moutinho