`information_schema.statistics.nullable`

mysql

type: VARCHAR NOT NULL

5.7-8

type: NULL

Note:

YES if the column may contain NULLs, empty string if not.

5.1-10.8

type: VARCHAR NOT NULL

Note:

YES if the column may contain NULLs, empty string if not.

type: VARCHAR(3) NULL

Note:

If the column might contain a NULL value, the value is YES; if not, the value is ''.

4-6.1