MS Access SQL UPDATE 使用多个表

Question

I am trying to update Table 1 using values from Table 2 and Table 3. There is no relation field between Table 1 and (Tables 2 and 3) so I am using a conditional WHERE Statement. I only want to pull CF from table 3 when the table3.TOS is 7 and pull the region portion from table2.stateID when table1.zip is between or equal to the start/end zip codes in table 2. Table 2 and 3 relate on a stateID field.

This code seems to work but when run Access says updating 5880 rows despite Table 1 only having 1471 rows. I am wondering what in my code is causing this number to be so inflated and when I run it, the tables look good with correct numbers. Again THIS CODE RUNS AS-IS but tells me it is updating way more rows than expected.

    UPDATE table1, table2, table3
    SET table1.region = '00' + right(table2.[stateID],2),
    table1.cf = table3.cf,
    table1.eff_date = '2020-03-01'
    WHERE (table3.[TOS] = '7' AND table2.[stateID] = table3.[stateID])
    AND (table1.[zip] = table2.[zip_start] 
    OR table1.[zip] = table2.[zip_end] 
    OR (table1.[zip] BETWEEN table2.[zip_start] AND table2.[zip_end]));

Answer 1

You can simplify the WHERE clause to:

WHERE table3.[TOS] = '7' AND
      table2.[stateID] = table3.[stateID] AND
      table1.[zip] BETWEEN table2.[zip_start] AND table2.[zip_end];

I wonder if MS Access is reporting multiple updates on the same row.