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.
A pg_hba.conf file is set up as follows. local all all md5 host all all 127.0.0.1/32 md5 host all all 172.16.1.0/24 md5 When user foo connects to database bar from host IP address 172.16.1.2, I would like password verification to not be performed. Select one appropriate line for the new pg_hba.conf file.
The table "t1" is defined below. The column "id"
for table "t1" is of INTEGER type.
id | name ----
+-----------1 |
mammoth 2 |
tortoise 3 |
coelacanth
The following SQL statements were executed. Select the correct statement about the execution result. BEGIN; DECLARE c SCROLL CURSOR FOR SELECT name FROM t1 ORDER BY id;
MOVE FORWARD 2 FROM c; FETCH FORWARD ALL FROM c; COMMIT;
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