Help Information

Procedure

When a database is being connected, run the following commands to obtain the help information:

gsql --help

The following help information is displayed:

......
Usage:
  gsql [OPTION]... [DBNAME [USERNAME]]

General options:
  -c, --command=COMMAND    run only single command (SQL or internal) and exit
  -d, --dbname=DBNAME      database name to connect to (default: "omm")
  -f, --file=FILENAME      execute commands from file, then exit
......

After the database is connected, run the following commands to obtain the help information:

help

The following help information is displayed:

You are using gsql, the command-line interface to gaussdb.
Type:  \copyright for distribution terms
       \h for help with SQL commands
       \? for help with gsql commands
       \g or terminate with semicolon to execute query
       \q to quit

Examples

Run the following command to connect to the database:
```
gsql -d postgres -p 8000
```
postgres is the name of the database to be connected, and 8000 is the port number of the database primary node.

If information similar to the following is displayed, the connection succeeds:
```
gsql ((GaussDB Kernel VxxxRxxxCxx build 290d125f) compiled at 2020-05-08 02:59:43 commit 2143 last mr 131)
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.
```

View the gsql help information. For details, see Table 1.

Table 1 gsql online help

Description

Example

View copyright information

\copyright

View help information about SQL statements supported by GaussDB.

For example, view all SQL statements supported by GaussDB.

           
                openGauss=# \h
Available help:
  ABORT                            
  ALTER AGGREGATE
  ALTER APP WORKLOAD GROUP                  
... ...

For example, view parameters of the CREATE DATABASE command:

           
                openGauss=# \help CREATE DATABASE
Command:     CREATE DATABASE
Description: create a new database
Syntax:
CREATE DATABASE database_name
     [ [ WITH ] {[ OWNER [=] user_name ]|
           [ TEMPLATE [=] template ]|
           [ ENCODING [=] encoding ]|
           [ LC_COLLATE [=] lc_collate ]|
           [ LC_CTYPE [=] lc_ctype ]|
           [ DBCOMPATIBILITY [=] compatibility_type ]|
           [ TABLESPACE [=] tablespace_name ]|
           [ CONNECTION LIMIT [=] connlimit ]}[...] ];

View help information about gsql commands

For example, view commands supported by gsql.

           
                openGauss=# \?
General
  \copyright             show openGauss usage and distribution terms
  \g [FILE] or ;         execute query (and send results to file or |pipe)
  \h(\help) [NAME]              help on syntax of SQL commands, * for all commands
  \q                     quit gsql
... ...