[EMAIL PROTECTED] wrote:
Hi all, got a question as how to approach a somewhat complicated join
query.  The deal is I have three tables called attorney, lawOffice, and
law_office_employment.  The attorney and lawOffice tables hold attorney
and lawOffice information respectively (obviously).  The
law_office_employment table is meant to show historical periods of time
for which the attorney's worked for the different lawOffices.

But it doesn't. Looking below, it shows the date they started in each law office, not the period they worked there.

In fact, you can't capture a period of unemployment/sabbatical using just this table.

> Here is
the create table statement for law_office_employment:

/*==============================================================*/
/* Table: LAW_OFFICE_EMPLOYMENT                                 */
/*==============================================================*/
create table LAW_OFFICE_EMPLOYMENT (
ATTORNEYID           IDENTIFIER           not null,
LAWOFFICEID          IDENTIFIER           not null,
STARTDATE            DATE                 not null,
constraint PK_LAW_OFFICE_EMPLOYMENT primary key (ATTORNEYID,
LAWOFFICEID, STARTDATE)
);

Make your life easier and have start and end-dates. Oh, you might want a "finished-here" flag too to indicate the end-date can be checked.

--
  Richard Huxton
  Archonet Ltd

---------------------------(end of broadcast)---------------------------
TIP 6: explain analyze is your friend

Reply via email to