命令 Command 作用 Action \h [NAME] help on syntax of SQL commands, * for all commands \d[S+] list tables, views, and sequences \d[S+] NAME describe table, view, sequence, or index \l[+] [PATTERN] list databases \echo [-n] [STRING] write string to standard output (-n for no newline) \i FILE execute commands from file \cd [DIR] change the current working directory \c[onnect] connect to new database \conninfo display information about current connection \q quit psql