SQL syntax is presented in modified BNF notation.
| Symbol | Meaning |
|---|---|
| | | or. Choose one of the items |
| [ ] | Enclose optional items. |
| * | Flags items that you can repeat 0 or more times. Has a special meaning in some SQL statements. |
| { } | Groups items so that they can be marked with one of the other symbols, i.e. [ ], |, or *. |
| ( ) . , | Other punctuation that is part of the syntax. |
CREATE [ UNIQUE ] INDEX IndexName ON TableName ( SimpleColumnName [ , SimpleColumnName ] * )
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