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Add 'IF NOT EXISTS' for indexes #4727

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Feb 19, 2025
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Add 'IF NOT EXISTS' for indexes #4727

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8 changes: 8 additions & 0 deletions docs/sql/statements/create_index.md
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Expand Up @@ -24,6 +24,14 @@ Create index `s_idx` that allows for duplicate values on column `revenue` of tab
CREATE INDEX s_idx ON films (revenue);
```

Create index if it does not yet exist:

```sql
CREATE INDEX IF NOT EXISTS s_idx ON films (revenue);
```

> The `CREATE INDEX IF NOT EXISTS` statement does not have an “early exit” at the moment, instead, it will attempt to create the index and only check its existence before committing it to storage. Therefore, it may run for a longer time compared to other `IF NOT EXISTS` statements, which terminate early.

Create compound index `gy_idx` on `genre` and `year` columns:

```sql
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1 change: 1 addition & 0 deletions js/statements/indexes.js
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Expand Up @@ -7,6 +7,7 @@ function GenerateCreateIndex(options = {}) {
Keyword("CREATE"),
Optional(Keyword("UNIQUE"), "skip"),
Keyword("INDEX"),
GenerateIfNotExists(),
Expression("name"),
Keyword("ON"),
Expression("table"),
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