Search notes:

SQL Server: sp_helpdbfixedrole

sp_helpdbfixedrole lists the fixed database roles. 
exec sp_helpdbfixedrole


DbFixedRole              Description
------------------------ -----------------------------------
db_owner                 DB Owners
db_accessadmin           DB Access Administrators
db_securityadmin         DB Security Administrators
db_ddladmin              DB DDL Administrators
db_backupoperator        DB Backup Operator
db_datareader            DB Data Reader
db_datawriter            DB Data Writer
db_denydatareader        DB Deny Data Reader
db_denydatawriter        DB Deny Data Writer

See also

sp_helpsrvrole lists the fixed server roles.
sp_helprole

Index

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