Question

I’m trying to work out how to make this view for my database

The number of meters read in the current month by each of the meter
readers (this view should be able to be used at any time without having to
be changed to accommodate the date).

The main trouble I’m having is counting how many times the employee has read a meter in the month. I’m using oracle and sql developer.

These are my tables:

a2_METERREADER

 - EMPLOYEEID
 - FIRSTNAME
 - LASTNAME

a2_READING

 - READINGID
 - METERID
 - EMPLOYEEID
 - BILLNUMBER
 - READING
 - DATERECORD

a2_Watermeter

 - METERID
 - ADDRESS
 - SUBURB
 - POSTCODE
 - STATUS
 - CUSTOMERID
 - REPLACE
 - INSTALLDATE

Answer 1

You need to join the meter reader and reading tables and count the number of rows, grouped by employee for the month in question.

Something along these lines:

SELECT reader.EMPLOYEEID, COUNT(reading.READINGID)
FROM a2_METERREADER reader, a2_READING reading
WHERE reader.EMPLOYEEID = reading.EMPLOYEEID
AND YEAR(reading.DATERECORD) = YEAR(SYSDATE)
AND MONTH(reading.DATERECORD) = MONTH(SYSDATE)
GROUP BY reader.EMPLOYEEID