PostgreSQL中的替代变量

参考：https://www.postgresql.org/docs/current/static/app-psql.html

postgres=# select * from tab_lei_1;
 c1 | c2 
----+----
(0 rows)


postgres=# \set abc 'tab_lei_1'
postgres=# select * from :abc;
 c1 | c2 
----+----
(0 rows)


postgres=#