how to retrieve a record that falls in a date range

[LPC]

I have 2 tables, one containing information about the staff of an office
(names, address, tel, etc.), and the other one containing their salary
history (StaffID, salary, date of salary modification). The 2 tables are
related by the field StaffID. Salaries for each staff are not fixed but can
be modified with time. For example, in Table Staffs, I have 2 persons, Mark
(ID=1) and Nelly (ID=2). In table Salary History, Mark ´s salary starts at
500 USD on 1-1-98, but on 1-6-99 has been increased to 600, and on 1-8-99,
modified again to 750 USD. Nelly, on the other hand, receives a salary of 650
USD as of 15-7-1998, but from 1-1-2000, this has been increased to 820.
Suppose we have to calculate their salaries for the month of July 1999.
Clearly we see that Mark´s salary for that month is of 600, and Nelly ´s is
750 (starting point), but I do not know how to create an expression that can
tell Access to retrieve this record by date comparison (July 1999 is greater
than 1-1-1998 and 1-6-1999, but smaller than 1-8-1999, so Access SHOULD
retrieve the record of 600 USD, corresponding to Mark ´s 1-6-99 ´s salary
modification, which is the most RECENT modification for that date range. The
same logic is for Nelly ´s salary). Please help me to give a solution to my
obstacle. Your valuable help would be much appreciated.

Luu Phuong Chi
Access beginner

 

[LPC]

PLEASE NOTE: THIS IS A RE-POST

RE: how to retrieve a record that falls in a date range

I have 2 tables, one containing information about the staff of an office
(names, address, tel, etc.), and the other one containing their salary
history (StaffID, salary, date of salary modification). The 2 tables are
related by the field StaffID. Salaries for each staff are not fixed but can
be modified with time. For example, in Table Staffs, I have 2 persons, Mark
(ID=1) and Nelly (ID=2). In table Salary History, Mark ´s salary starts at
500 USD on 1-1-98, but on 1-6-99 has been increased to 600, and on 1-8-99,
modified again to 750 USD. Nelly, on the other hand, receives a salary of 650
USD as of 15-7-1998, but from 1-1-2000, this has been increased to 820.
Suppose we have to calculate their salaries for the month of July 1999.
Clearly we see that Mark´s salary for that month is of 600, and Nelly ´s is
750 (starting point), but I do not know how to create an expression that can
tell Access to retrieve this record by date comparison (July 1999 is greater
than 1-1-1998 and 1-6-1999, but smaller than 1-8-1999, so Access SHOULD
retrieve the record of 600 USD, corresponding to Mark ´s 1-6-99 ´s salary
modification, which is the most RECENT modification for that date range. The
same logic is for Nelly ´s salary). Please help me to give a solution to my
obstacle. Your valuable help would be much appreciated.

Luu Phuong Chi
Access beginner

 

[Douglas J. Steele]

One problem you may be having is that in SQL statements, Access will not
recognize dates in dd/mm/yyyy format unless the day is greater than 12
(since there isn't a 13th month).

 

[LPC]

Hi, could you please explain it in an easier way? I cann´t understand the
relationship between the need to have the DAY greater than 12 while the
answer is about MONTH. It sounds too confusing to me. Anyway, as I don´t even
have the SQL written (that ´s why I posted the question before), I´d
appreciate your help in giving me a possible syntax (I´m only accustomed to
simple queries and macros, not VBA).
Thanks
LPC

 

[Douglas J. Steele]

The point I was trying to make is that you must use mm/dd/yyyy date format
in your queries. Regardless of what your regional settings are, Access will
not recognize dates in dd/mm/yyyy format. The exception to that is when the
day in the date is greater than 12: Access will recognize 15/1/2005 as 15
Jan, 2005, because there is no 15th month. It will always, however,
recognize 12/1/2005 as 1 Dec, 2005, never as 12 Jan, 2005.

For more information about working with International Dates, see Allen
Browne's "International Dates in Access" at
http://members.iinet.net.au/~allenbrowne/ser-36.html or what I have in my
September 2003 Access Answers column for Pinnacle Publication's "Smart
Access" newsletter. (The column and accompanying database can be downloaded
for free at
http://members.rogers.com/douglas.j.steele/SmartAccess.html)