Help on SQL Syantax

Dear Anyone,
I am no expert with SQL server but I am trying obtain
some data from this server using SQL syntax, I would like
to average out the data by correction_col_date below, can
anyone help please!
SELECT SAMPLE.PRODUCT_VERSION, PRODUCT.DESCRIPTION,
SAMPLE.PRODUCT, SAMPLE.PRODUCT_GRADE,
SAMPLE.CORRECTED_COL_DATE, SAMPLE.COLLECTION_TIME,
SAMPLE.LOCATION, PRODUCT_SPEC.NOMINAL_VALUE,
PRODUCT_SPEC.MAX_VALUE, PRODUCT_SPEC.MIN_VALUE,
RESULT.IN_SPEC, SAMPLE.LOGIN_BY, UNITS.DISPLAY_STRING,
RESULT.NAME, RESULT.ALIAS_NAME, RESULT.REPORTED_NAME,
RESULT.ENTRY FROM PRODUCT_SPEC, SAMPLE, RESULT, UNITS,
PRODUCT WHERE SAMPLE.PRODUCT = <<PROD_BRWSER>> AND
SAMPLE.CORRECTED_COL_DATE BETWEEN <<DATERANGE>> AND
SAMPLE.LOCATION= <<LOCATION_BROWSE>> AND
PRODUCT_SPEC.PRODUCT = SAMPLE.PRODUCT AND PRODUCT.NAME =
SAMPLE.PRODUCT AND PRODUCT_SPEC.VERSION =
SAMPLE.PRODUCT_VERSION AND PRODUCT_SPEC.GRADE =
SAMPLE.PRODUCT_GRADE AND
PRODUCT_SPEC.ANALYSIS = RESULT.ANALYSIS AND
PRODUCT_SPEC.COMPONENT = RESULT.NAME AND
RESULT.SAMPLE_NUMBER = SAMPLE.SAMPLE_NUMBER AND
((RESULT.ALIAS_NAME LIKE '%MEAN') OR (RESULT.ALIAS_NAME
LIKE '%SD')) AND RESULT.UNITS=UNITS.UNIT_CODE AND
RESULT.STATUS = 'A' AND SAMPLE.STATUS = 'A'ORDER BY
CORRECTED_COL_DATE
Thanks,
Annette
post relevent table structures, sample data and expected result set.
Vishal Parkar
vgparkar@.yahoo.co.in | vgparkar@.hotmail.com