PostgreSQL Exam PGCES-02 Topic 1 Question 77 Discussion

The table "foo" is defined as follows: CREATE TABLE foo (bar

TEXT); Next, four SQL statements were executed in the following order. INSERT INTO foo VALUES ('bar'); -------- (1)

ALTER TABLE foo ADD COLUMN c1 TEXT; ---- (2) ALTER

TABLE foo ADD UNIQUE (c1); ------- (3) ALTER TABLE foo

DROP COLUMN bar; ------- (4) Select the correct statement from those below.