在psql中，使用\watch反复查看语句的执行结果

test=> \c test a

You are now connected to database "test" as user "a".

test=> select * from a.test;

id

----

1

(1 row)

test=> select * from a.test; \watch 1 -----单位为秒

id

----

1

(1 row)

Wed 08 Feb 2017 09:57:04 AM CST (every 1s)

id

----

1

(1 row)

Wed 08 Feb 2017 09:57:05 AM CST (every 1s)

id

----

1

(1 row)

Wed 08 Feb 2017 09:57:06 AM CST (every 1s)

id

----

1

(1 row)

Wed 08 Feb 2017 09:57:07 AM CST (every 1s)

id

----

1

(1 row)