If you need to update an existing table, check out this guide:
http://www.w3schools.com/sql/sql_update.asp
Edit: To update a table in SQL you would use a query that looks like this:
UPDATE table_name
SET column1=value1,column2=value2,...
WHERE some_column=some_value; --This line is not necessary.
--You can add this if you wish to only update certain rows
--e.g WHERE Date >= someDate
If you’re creating a new table. I’d suggest check out the w3schools guides for CREATE TABLE, and INSERT.
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solved Need to create column and add values (Date) to a that column SQL