Creación sqlFunctions y de los ficheros de la documentación.

Docs/sqlFunctions-doc.Rmd

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+---
+title: "sqlFunctions-Doc"
+output: html_document
+---
+
+```{r setup, include=FALSE}
+knitr::opts_chunk$set(echo = TRUE)
+```
+
+
+## sqlDropLast
+
+### Description
+Removes from Database the last (or the amount specified) entry.
+
+### Usage
+sqlDropLast(conn, tablename, droplast=1)
+
+### Arguments
+Argument|Description
+---|---
+conn|connection handle returned by odbcConnect.
+tablename|character: a database table name accessible from the connected DSN.
+droplast|the amount of lines to be removed from the table strating from tail. By default, it removes only 1 line.
+
+### Details
+Removes from Database the last (or the amount specified) entry.
+
+### Value
+Invisibly for success (and failures cause errors).
+
+### Examples
+```r
+dta<-odbcConnect("test")
+sqlDropLast(dta, "TableTest")
+```
+
+### Function
+```r
+sqlDropLast<-function(conn, tablename, droplast=1){
+  table<-sqlFetch(conn, tablename)
+  table<-table[1:(nrow(table)-droplast),]
+  sqlSave(conn, table, tablename = tablename, safer = F)
+}
+```