Creating joins based on range of number value - ms-access

Question

Could you guys provide me on the situation below?
I have 2 tables.
Table 1 looks like this:
Meanwhile, this is table 2:
I would like to join table 2 to table 1 to lookup the grade for each job based on the upper and lower limit column.
By conceptualizing some of the lovely answers here, I manage to come up with a statement that looks something like this:
FROM table2 LEFT JOIN table1 ON (table2.[score] >= table1.[lower limit]) AND (table2.[score] <= table1.[upper limit])
The statement above manage to join them according to a range, however, for some unknown reasons, some rows from the left table went missing and I could not determine what it is. e.g (2000 rows in table 2, but only 1800 in the query)
I am sure the join is the cause, as if i change the join to a equal left join, 2000 rows appear in the query.
Can someone advice me on this?
Regards,
Guang Yong

Answer 1

Perhaps it would be much cleaner to create a table with values from 1-100 and assign them each on of your categories, and essentially mirroring your table 1.
Then you can do Table 2
SELECT Table1.Grade, Table2.Score
FROM Table2 LEFT JOIN Table1 ON Table2.Score = Table1.Score
This would definitely cover all integers between 0 and 100.
If you are manually inputing the scores, you could also use a data macro as simple as this:
go to Table Tools >> Table >> Before Change
Then use the Set Field Action, and set
Name = Table2.Grade
Value = IIf([Score]>=70,"Good",IIf([Score]<=59,"bad","so so"))
With this ^ everytime you type in a score, it will automatically populate the grade column.
Another option is create a query as follows, that will evaluate each line and assign the proper grade:
SELECT Table2.Score,
IIf([Score]>=70,"Good",IIf([Score]<=59,"bad","so so")) AS Grade
FROM Table2;
Good luck!