Question

I have a table: name, date, url, no, url includes "facebook","twitter","other".

How can I generate a new table: date, facebook, twitter, total, unique name, such that, grouping by date, facebook field is the sum of the no WHERE url="facebook", and same as twitter; total field is the sum of the no of all; unique name counts the distinct name number?

Answer 1

You can use SUM/CASE for this.

SELECT Date,
       SUM(case when url = 'facebook' then no else 0 end) as facebook,
       SUM(case when url = 'twitter' then no  else 0 end) as twitter,
       SUM(no) total,
       COUNT(DISTINCT NAME) as `unique name`
FROM
      table
GROUP BY
      date