Re: [R] merge two data frame based on equal and unequal comparisons

On Behalf Of Ding, Yuan Chun Sent: Wednesday, April 18, 2018 10:38 AM To: r-help@r-project.org Subject: [R] merge two data frame based on equal and unequal comparisons [Attention: This email came from an external source. Do not open attachments or click on links from unknown senders or unexpected

[R] merge two data frame based on equal and unequal comparisons

Dear R users, I need to merge two data frames based on both equal and unequal comparisons. The "sqldf" package used to work well , but today, I cannot resolve the following error by reinstallation of the sqldf package. Can anyone suggest a different way to perform this kind of merge function