Extracting data from the Synergetic database

Common duplication problems
Extracting data from the Synergetic database
Example 2
Another cause of duplication in a student contact query comes from the selection of any student fields.
For example, you want to mail out one letter to the parents of students, regardless of whether they
have multiple siblings at the school. You also decide that you want to sort by YearLevel so you use
this field as well.
To adjust the query to avoid duplications because siblings may be in different year levels, you need to
add the:
• YearLevel field to the query
• key word DISTINCT.
Query with correction
SELECT DISTINCT StudentContactMailName, StudentContactAddressComma, YearLevel
FROM vStudentContactAddress
WHERE StudentContactNormalMailFlag = 1 AND
CurrentSemesterOnlyFlag = 1
Returns
ContactMailName ContactAddress YearLevel
Mr Joe Black 15 Green St, MT WAVERLEY VIC 3149 5
Mr Joe Black 15 Green St, MT WAVERLEY VIC 3149 10
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