12-09-2012
I have to say that I have never heard this particular issue called the Control Break Algorithm before but a quick Internet search showed that the term is becoming somewhat common among educators. In SQL, this would be handled by the GROUP BY statement, in XSLT it is called grouping and is typically handled by the Muenchian Method.
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Not sure if I am using the correct terminology:
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LEARN ABOUT CENTOS
alter_group
ALTER
GROUP(7) PostgreSQL 9.2.7 Documentation ALTER GROUP(7)
NAME
ALTER_GROUP - change role name or membership
SYNOPSIS
ALTER GROUP group_name ADD USER user_name [, ... ]
ALTER GROUP group_name DROP USER user_name [, ... ]
ALTER GROUP group_name RENAME TO new_name
DESCRIPTION
ALTER GROUP changes the attributes of a user group. This is an obsolete command, though still accepted for backwards compatibility, because
groups (and users too) have been superseded by the more general concept of roles.
The first two variants add users to a group or remove them from a group. (Any role can play the part of either a "user" or a "group" for
this purpose.) These variants are effectively equivalent to granting or revoking membership in the role named as the "group"; so the
preferred way to do this is to use GRANT(7) or REVOKE(7).
The third variant changes the name of the group. This is exactly equivalent to renaming the role with ALTER ROLE (ALTER_ROLE(7)).
PARAMETERS
group_name
The name of the group (role) to modify.
user_name
Users (roles) that are to be added to or removed from the group. The users must already exist; ALTER GROUP does not create or drop
users.
new_name
The new name of the group.
EXAMPLES
Add users to a group:
ALTER GROUP staff ADD USER karl, john;
Remove a user from a group:
ALTER GROUP workers DROP USER beth;
COMPATIBILITY
There is no ALTER GROUP statement in the SQL standard.
SEE ALSO
GRANT(7), REVOKE(7), ALTER ROLE (ALTER_ROLE(7))
PostgreSQL 9.2.7 2014-02-17 ALTER GROUP(7)