## Syntax
```mermaid
%%{init: {
'theme': 'base',
'flowchart': { 'padding': '7', 'nodeSpacing': '20', 'rankSpacing': '20' },
'themeVariables': {
'fontSize': '11px',
'fontFamily': 'Arial'
}
}}%%
flowchart LR
Start((START)) --> TO_HEX[TO_HEX]:::quoted
TO_HEX --> End((END))
```
## Purpose
The `TO_HEX` SQL function converts a BLOB into a text in hexadecimal notation.
See also [[ASCII_TO_BLOB]], [[BLOB_TO_TEXT]] and [[HEX_TO_BLOB]].
Parameters:
- Input (`blob`): value to convert to hexadecimale notation.
Returns: the BLOB converted to a text in hexadecimal notation as a `varchar2`.
## Examples
The following example retrieves the hexadecimal notation of a GUID:
```sql
select to_hex(newid())
--------------------------------------
cde6acae957b492ea304bfd8692f1ace
```
The following example retrieves the hexadecimal notation of a GZIP-compressed variant of the single byte ASCII character `x`:
```sql
select to_hex(gzip('eA=='))
--------------------------------------
1F8B0800E4BF266A00FFAB00008316DC8C01000000
```