SQL Syntax Formats
Table 1 SQL syntax formats
| Format | Meaning |
|---|---|
| [] | Bracketed content is optional. |
| ... | The preceding element may be repeated. |
| [ x | y | ... ] | Choose one option or none from two or more options. |
| { x | y | ... } | Choose exactly one option. |
| [ x | y | ... ] [ ... ] | Choose zero or more options, separated by spaces. |
| [ x | y | ... ] [ ,... ] | Choose zero or more options, separated by commas. |
| { x | y | ... } [ ... ] | Choose one or more options, separated by spaces. |
| { x | y | ... } [ ,... ] | Choose one or more options, separated by commas. |