Lu, Huayi
a24ca60074
Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com> Co-authored-by: Lu, Huayi <luhuayi@huawei.com> Co-committed-by: Lu, Huayi <luhuayi@huawei.com>
9.3 KiB
Conventions
Example Conventions
Example |
Description |
|---|---|
dbadmin |
Indicates the user operating and maintaining GaussDB(DWS) appointed when the cluster is created. |
8000 |
Indicates the port number used by GaussDB(DWS) to monitor connection requests from the client. |
SQL examples in this manual are developed based on the TPC-DS model. Before you execute the examples, install the TPC-DS benchmark by following the instructions on the official website https://www.tpc.org/tpcds/.
SQL Syntax Text Conventions
To better understand the syntax usage, you can refer to the SQL syntax text conventions described as follows:
Format |
Description |
|---|---|
Uppercase characters |
Indicates that keywords must be in uppercase. |
Lowercase characters |
Indicates that parameters must be in lowercase. |
[ ] |
Indicates that the items in brackets [] are optional. |
... |
Indicates that preceding elements can appear repeatedly. |
[ x | y | ... ] |
Indicates that one item is selected from two or more options or no item is selected. |
{ x | y | ... } |
Indicates that one item is selected from two or more options. |
[x | y | ... ] [ ... ] |
Indicates that multiple parameters or no parameter can be selected. If multiple parameters are selected, separate them with spaces. |
[ x | y | ... ] [ ,... ] |
Indicates that multiple parameters or no parameter can be selected. If multiple parameters are selected, separate them with commas (,). |
{ x | y | ... } [ ... ] |
Indicates that at least one parameter can be selected. If multiple parameters are selected, separate them with spaces. |
{ x | y | ... } [ ,... ] |
Indicates that at least one parameter can be selected. If multiple parameters are selected, separate them with commas (,). |