Sorry! It is the end of the day for me. So
dput(x) structure(list(prochi = c("CAO0000713", "CAO0000713", "CAO0000713", "CAO0000713", "CAO0000713", "CAO0000713", "CAO0000713", "CAO0000713", "CAO0000713", "CAO0000713"), prescribed_date = c("22/06/2001", "28/04/2000", "10/04/2000", "03/07/2000", "09/01/2001", "16/10/2001", "16/08/2001", "17/09/1993", "01/05/2001", "05/03/2001"), dataMonth = c("NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL"), item_code = c("842752", "7800", "842652", "842652", "842752", "842752", "842752", "39620", "842752", "842752"), res_seqno = c("NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL"), quantity = c("60", "100G", "60", "60", "60", "60", "60", "5ML", "60", "60"), directions = c("1/D", "A/TD", "1/D", "1/D", "1/D", "1/D", "1/D", "NIL", "1/D", "1/D"), no_of_packs = c("NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL"), datasource = c("TSF", "TSF", "TSF", "TSF", "TSF", "TSF", "TSF", "TSF", "TSF", "TSF"), scan_ref_no = c("NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL", "NULL" )), .Names = c("prochi", "prescribed_date", "dataMonth", "item_code", "res_seqno", "quantity", "directions", "no_of_packs", "datasource", "scan_ref_no"), row.names = c(NA, 10L), class = "data.frame") y_data <- read.table(file="http://n4.nabble.com/file/n1590804/feb09_267_presc_items_tsf.txt", header = TRUE, sep = "|", quote = "\"'", dec = ".",as.is = TRUE,na.strings = "NA",colClasses = NA, nrows = 3864284, skip = 0, check.names = TRUE,fill=TRUE, strip.white = TRUE, blank.lines.skip = TRUE, comment.char = "#", allowEscapes = FALSE, flush = FALSE, fileEncoding = "", encoding = "unknown") So the y_data essentially contains the lookup table for the item codes in x. Thanks and sorry for the mix up -- View this message in context: http://n4.nabble.com/sqldf-not-joining-all-the-fields-tp1590786p1590849.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.