pgsql decode用法
    In PostgreSQL, the `decode()` function is used to convert a string encoded value into a decoded form. It takes three arguments: the input string, a string that specifies the format of the input, and a series of pairs of strings that represent values to be converted.
    Here is the syntax for using the `decode()` function in PostgreSQL:
    ```
decode(input_string text, format text, [ value_pair text, ...])
```
    The `input_string` argument represents the string that needs to be decoded.
represent的用法
    The `format` argument specifies the encoding format of the `input_string`. This can be any valid encoding format supported by PostgreSQL, such as 'hex', 'escape', 'base64', etc.
    The `value_pair` arguments represent pairs of strings. The first string in each pair represents a specific string value in the input string that needs to be converted, and the second string represents the corresponding converted value.
    Here is an example that demonstrates the usage of the `decode()` function:
    ```sql
SELECT decode('68656C6C6F', 'hex', 'Hello');
```
    Output:
```
Hello
```
    In the above example, the `hex` format is specified, and the input string `68656C6C6F` is converted from its hexadecimal representation to the corresponding decoded value `Hello`.
    Note that the `decode()` function is deprecated and discouraged to use in favor of other functions or techniques for handling encoding or decoding in PostgreSQL.

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