<p>How do I check if an index exists on a table field in MySQL?</p>
<p>I've needed to Google this multiple times, so I'm sharing my Q/A.</p>

Use
```
SHOW INDEX
```
like so:
```
```
SHOW INDEX FROM [tablename]
```
```
Docs:
https://dev.mysql.com/doc/refman/5.0/en/show-index.html