## Syntax
```mermaid
%%{init: {
'theme': 'base',
'flowchart': { 'padding': '7', 'nodeSpacing': '20', 'rankSpacing': '20' },
'themeVariables': {
'fontSize': '11px',
'fontFamily': 'Arial'
}
}}%%
flowchart LR
Start((START)) --> | | HEX_TO_BLOB[HEX_TO_BLOB]:::quoted
HEX_TO_BLOB --> End((END))
```
## Purpose
The `HEX_TO_BLOB` SQL function casts a text in hexadecimal notation to the corresponding BLOB. Reverse of to_hex.
Parameters:
- Text: text in hexadecimal notation with two characters per byte.
Returns: BLOB.