How to Write Update Query to Update Two Tables with SQL Data Source

Update with two tables?

Your query does not work because you have no FROM clause that specifies the tables you are aliasing via A/B.

Please try using the following:

UPDATE A
    SET A.NAME = B.NAME
FROM TableNameA A, TableNameB B
WHERE A.ID = B.ID

Personally I prefer to use more explicit join syntax for clarity i.e.

UPDATE A
    SET A.NAME = B.NAME
FROM TableNameA A
    INNER JOIN TableName B ON 
        A.ID = B.ID

How to update multiple tables with single query

Here is an example using the output clause:

declare @ids table (id int);

update table1
    set status = 1
    output inserted.id into @ids
    where status = 2;

update table2
    set status = 1,
        date = getdate()
    where personid in (select id from @ids);

update multiple table using one query in SQL SERVER

You can't. Update statement works for a single table. You have to write three different queries for three tables.

You can use transaction to make sure that your update statements are atomic.

BEGIN TRANSACTION

UPDATE Table1
Set Field1 = '1';
Where Field = 'value';

UPDATE Table2
Set Field1= '2'
Where Field = 'value';

UPDATE Table3
Set Field1= '3'
Where Field = 'value';

COMMIT

For C# you can use SqlTransaction. An example from the same link (bit modified)

private static void ExecuteSqlTransaction(string connectionString)
{
    using (SqlConnection connection = new SqlConnection(connectionString))
    {
        connection.Open();

        SqlCommand command = connection.CreateCommand();
        SqlTransaction transaction;

        // Start a local transaction.
        transaction = connection.BeginTransaction("SampleTransaction");

        // Must assign both transaction object and connection 
        // to Command object for a pending local transaction
        command.Connection = connection;
        command.Transaction = transaction;

        try
        {
            command.CommandText =
                "UPDATE Table1 Set Field1 = '1' Where Field = 'value';";
            command.ExecuteNonQuery();
            command.CommandText =
                "UPDATE Table2 Set Field1= '2' Where Field = 'value'";
            command.ExecuteNonQuery();

            command.CommandText =
                "UPDATE Table3 Set Field1= '3' Where Field = 'value'";
            command.ExecuteNonQuery();

            // Attempt to commit the transaction.
            transaction.Commit();
            Console.WriteLine("Both records are written to database.");
        }
        catch (Exception ex)
        {
            Console.WriteLine("Commit Exception Type: {0}", ex.GetType());
            Console.WriteLine("  Message: {0}", ex.Message);

            // Attempt to roll back the transaction. 
            try
            {
                transaction.Rollback();
            }
            catch (Exception ex2)
            {
                // This catch block will handle any errors that may have occurred 
                // on the server that would cause the rollback to fail, such as 
                // a closed connection.
                Console.WriteLine("Rollback Exception Type: {0}", ex2.GetType());
                Console.WriteLine("  Message: {0}", ex2.Message);
            }
        }
    }
}

Update multiple tables in SQL Server using INNER JOIN

You can't update more that one table in a single statement, however the error message you get is because of the aliases, you could try this :

BEGIN TRANSACTION

update A
set A.ORG_NAME =  @ORG_NAME
from table1 A inner join table2 B
on B.ORG_ID = A.ORG_ID
and A.ORG_ID = @ORG_ID

update B
set B.REF_NAME = @REF_NAME
from table2 B inner join table1 A
    on B.ORG_ID = A.ORG_ID
    and A.ORG_ID = @ORG_ID

COMMIT

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