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mmparker/dynamic_query_date.r

Created March 10, 2015 22:31
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Dynamic dates in SQL queries in R
Raw
dynamic_query_date.r
# Pick some dynamic date - here's the start of the current month
start_date <- format(Sys.Date(), "%Y-%m-01")
# Then use paste0() to construct a query that includes it
# Here's an example to get all the positive QFTs this month
# (I have probably misremembered the field names).
# I'm pretty sure you have to put a # on each side of the
# date in order for Access to recognize it as a date.
test_query <- sqlQuery(tbdb,
paste0("SELECT person_id, test_date
FROM QFT_View
WHERE test_date >= #",
start_date,
"# AND result = 'Positive'"
)
)
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