Oracle sql left join problem

Getting error at line 35

see attachment for entire code but

here are  the lines in question

  LEFT JOIN (select DISTINCT(PERSON_ID, SCHOOL_YEAR, SCHOOL_CODE) from FS_SE_STUDENT_SCHOOL_IEP) SCHOOLIEP
                 ON  SCHOOLIEP.PERSON_ID = STUDENT_REGISTRATIONS.PERSON_ID
                 AND SCHOOLIEP.SCHOOL_YEAR  = STUDENT_REGISTRATIONS.SCHOOL_YEAR
                 AND SCHOOLIEP.SCHOOL_CODE = STUDENT_REGISTRATIONS.SCHOOL_CODE
guinnieAsked:
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Steve WalesSenior Database AdministratorCommented:
No attachment here ... and no specific error message.  Please provide both?
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chaauCommented:
DISTINCT is not a function. It is a keyword. Therefore, no brackets are required:
select DISTINCT PERSON_ID, SCHOOL_YEAR, SCHOOL_CODE from FS_SE_STUDENT_SCHOOL_IEP

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Geert GOracle dbaCommented:
get rid of the duplicates and then leave the distinct out

 LEFT JOIN FS_SE_STUDENT_SCHOOL_IEP SCHOOLIEP
                 ON  SCHOOLIEP.PERSON_ID = STUDENT_REGISTRATIONS.PERSON_ID
                 AND SCHOOLIEP.SCHOOL_YEAR  = STUDENT_REGISTRATIONS.SCHOOL_YEAR
                 AND SCHOOLIEP.SCHOOL_CODE = STUDENT_REGISTRATIONS.SCHOOL_CODE
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Mark GeerlingsDatabase AdministratorCommented:
Be very careful with the word "distinct" in Oracle queries.  Yes, that keyword is supported in Oracle.  But it can cause two problems:
1. Oracle's definition of what "distinct" means may be different from what most humans expect, especially if there is a date column involved, and the date values include a non-midnight time-of-day.
2. This forces a sort operation, so depending on how many duplicate rows exists, this can add a significant performance penalty.
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