2 查看帮助
psql提供了很好的在线帮助文档,总入口命令是help,输入这个命令就可以看到
vsb9=# help
You are using psql, the command-line interface to PostgreSQL.
Type: \copyright for distribution terms
\h for help with SQL commands
\? for help with psql commands
\g or terminate with semicolon to execute query
\q to quit