Comments (4)
what's the smallest catalog that will create mdb_src
? what rows (as few as possible) can i subset this_cat <- get_catalog( "datasus" , output_dir = tempdir() )
to in order to reproduce this? thanks
from lodown.
Try this:
library(lodown)
library(DBI)
library(MonetDBLite)
catalog <- get_catalog( "datasus" , output_dir = tempdir() )
catalog <- subset( catalog , year %in% 1999:2000 )
catalog <- subset( catalog , type == "mortality" )
catalog <- subset( catalog , special == "infantil" )
lodown( "datasus" , catalog = catalog )
path_to_db = paste0( tempdir() , "/MonetDB")
db <- dbConnect( MonetDBLite() , path_to_db )
dbListTables(db)
dbGetQuery( db , "SELECT RIGHT( cast( dtobito as text ) , 4 ) as ano , COUNT(*) from infantil_cid10 GROUP BY ano order by ano" )
from lodown.
nice. thanks.
library(DBI)
db <- dbConnect( MonetDBLite::MonetDBLite() )
x <- data.frame( col = c( 10000000 , 1000 ) )
dbWriteTable( db , 'x' , x )
# CAST( ... AS TEXT ) includes exponentials
dbGetQuery( db , "SELECT CAST( col AS TEXT ) FROM x" )
dbGetQuery( db , "SELECT RIGHT( CAST( col AS TEXT ) , 4 ) FROM x" )
# easy workaround
dbGetQuery( db , "SELECT RIGHT( CAST( CAST( col AS BIGINT ) AS TEXT ) , 4 ) FROM x" )
from lodown.
sure, i think it's safer to use dbListFields( db , tablename )
instead of digging into sys tables though?
from lodown.
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from lodown.