CREATE TABLE acceptance (workshop_id VARCHAR, Submission_ID VARCHAR)
CREATE TABLE submission (Author VARCHAR, Submission_ID VARCHAR)

Show each author and the number of workshops they submitted to.
SELECT T2.Author, COUNT(DISTINCT T1.workshop_id) FROM acceptance AS T1 JOIN submission AS T2 ON T1.Submission_ID = T2.Submission_ID GROUP BY T2.Author
SELECT "T2"."Author", COUNT(DISTINCT "T1"."workshop_id") FROM "acceptance" AS "T1" JOIN "submission" AS "T2" ON "T1"."Submission_ID" = "T2"."Submission_ID" GROUP BY "T2"."Author"