I want to match a date from one table column, with a date from a second table, and when the dates match, insert a value in a separate column in the second table, corresponding to that date. For example the first table is a list of flowering dates each year and the second table is the daily weather data for those years i.e. the tables are different sizes. If the date in the first table matches the date in the weather data, I want to insert "flowering" in a separate column corresponding to that date in the second table. This is so so I can then do for example temperature summations leading up to flowering.