### REPEAT 

#### Description
The `REPEAT` function is used to repeat a string `str` `times` times and return the generated string.

#### Parameters
- `str` (string type): The string to be repeated.
- `times` (int type): The number of times the string `str` needs to be repeated.

#### Return Type
Returns a string that is the result of repeating `str` `times` times.

#### Example Usage
1. Repeating a single character:
```sql
SELECT REPEAT('a', 3);
```
Results:
```
aaa
```
2. Repeat a word: {#repeat-a-word}

```sql
SELECT REPEAT('hello', 2);
```
Results:
```
hellohello
```
3. Use with other functions, such as concatenating strings:
```sql
SELECT CONCAT('The word " ', REPEAT('repeat', 2), ' " appears multiple times.');
```
Results:
```
The word " repeatrepeat " appears multiple times.
```
#### Notes
- Ensure the `times` parameter is a positive integer, otherwise the function will return an empty string.
- When `times` is 0, the function returns an empty string.
- If the `str` or `times` parameters are not of the expected type, the function may return an error or an empty string.

By using the `REPEAT` function, you can easily create strings with repeating patterns, which is very useful for generating test data or padding strings.