information_schema.system_variables.*

show items implemented by
relation column mysqlmariadbtidbpostgrescockroachdbmssql
system_variables  
command_line_argument unsupported NULL: unsupported unsupported unsupported unsupported
default_value unsupported NULL: unsupported unsupported unsupported unsupported
enum_value_list unsupported NULL: unsupported unsupported unsupported unsupported
global_value unsupported NULL: unsupported unsupported unsupported unsupported
global_value_origin unsupported VARCHAR NOT NULL: NULL: unsupported unsupported unsupported unsupported
global_value_path unsupported NULL: unsupported unsupported unsupported unsupported
numeric_block_size unsupported NULL: unsupported unsupported unsupported unsupported
numeric_max_value unsupported NULL: unsupported unsupported unsupported unsupported
numeric_min_value unsupported NULL: unsupported unsupported unsupported unsupported
read_only unsupported VARCHAR NOT NULL: NULL: unsupported unsupported unsupported unsupported
session_value unsupported NULL: unsupported unsupported unsupported unsupported
variable_comment unsupported VARCHAR NOT NULL: NULL: unsupported unsupported unsupported unsupported
variable_name unsupported VARCHAR NOT NULL: NULL: unsupported unsupported unsupported unsupported
variable_scope unsupported VARCHAR NOT NULL: NULL: unsupported unsupported unsupported unsupported
variable_type unsupported VARCHAR NOT NULL: NULL: unsupported unsupported unsupported unsupported