MySQL FUNCTION social_gis.ST_Multi does not exist

这个问题可能是由于以下原因引起的：

1. social_gis.ST_Multi 是一个自定义函数，而不是MySQL内置函数。因此，您需要确保已经将该函数正确地安装到您的MySQL实例中。

2. 如果您已经安装了 social_gis.ST_Multi 函数，但是该函数仍然无法正常工作，可能是因为您的MySQL实例没有正确的权限访问该函数。您可以检查一下是否已经授权该函数，或者尝试使用更高的权限运行您的MySQL实例。

3. 另外一个可能的原因是您的MySQL实例版本太低，无法支持 social_gis.ST_Multi 函数。请升级您的MySQL实例至最新版本，或者使用适当版本的函数。

希望以上信息能对您有所帮助。如果您有其他问题，请随时向我提问。

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SQL 错误 [1305] [42000]: FUNCTION biidvs_pad.nextval does not exist

The error message you are seeing indicates that a function called "nextval" is being called in a SQL statement, but this function does not exist in the database.

In MySQL, the "nextval" function does not exist, but it is used in some other databases (such as PostgreSQL) to get the next value from a sequence object.

If you are trying to generate a sequence of unique values for a column in MySQL, you can use the "AUTO_INCREMENT" attribute on the column definition. For example, you can define a table with an "id" column as follows:

CREATE TABLE mytable (
  id INT AUTO_INCREMENT PRIMARY KEY,
  name VARCHAR(255)
);

Then when you insert a new row without specifying a value for the "id" column, MySQL will automatically generate a unique value for it:

INSERT INTO mytable (name) VALUES ('John');

The "id" column will be automatically incremented for each new row inserted into the table.

So, you need to modify your SQL statement to use the appropriate syntax for generating unique values in MySQL.