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fix example for expression index (#6499) #6574

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Sep 29, 2021
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fix example for expression index (#6499) #6574

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a566d60
fix example for expression index
shichun-0415 Sep 17, 2021
d61711f
Update sql-statements/sql-statement-create-index.md
TomShawn Sep 29, 2021
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10 changes: 7 additions & 3 deletions sql-statements/sql-statement-create-index.md
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Expand Up @@ -110,25 +110,29 @@ For example, if you want to create an index based on `lower(col1)`, execute the
{{< copyable "sql" >}}

```sql
CREATE INDEX idx1 ON t1 (lower(col1));
CREATE INDEX idx1 ON t1 ((lower(col1)));
```

Or you can execute the following equivalent statement:

{{< copyable "sql" >}}

```sql
ALTER TABLE t1 ADD INDEX idx1(lower(col1));
ALTER TABLE t1 ADD INDEX idx1((lower(col1)));
```

You can also specify the expression index when you create the table:

{{< copyable "sql" >}}

```sql
CREATE TABLE t1(col1 char(10), col2 char(10), key index(lower(col1)));
CREATE TABLE t1(col1 char(10), col2 char(10), key index((lower(col1))));
```

> **Note**
>
> The expression in an expression index must be surrounded by '(' and ')'. Otherwise, a syntax error is reported.

You can drop an expression index in the same way as dropping an ordinary index:

{{< copyable "sql" >}}
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