Customer – Group – Lessee – Lease
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Customer

Data Model Diagrams

Customer – Group – Lessee – Lease

-----------------------                                                          -----------------------
|   rcu Customer      |                          cus_s                           |   rfl Group         |
|=====================|--------------------------------------------------------->|=====================|
|   cus_s: customer   |                                                          |   cus_s: customer   |
-----------------------                                                          |   grp_s: group      |
       |    |                                                                    -----------------------
       |    |                                                                               |
       |    |           -----------------------                                             |
       |    | cus_s     |   ral Lessee        |                                             |
       |    +---------->|=====================|                                             |
       |                |   les_s: lessee     |                                             |
       |                |   cus_s: customer   |                                             |
       |                -----------------------                                             |
       |                           |                                                        |
       |                           |                                                        |
       |                           |             -----------------------                    |
       |                           | les_s       |   rls Lease         |                    |
       |                           +------------>|=====================|                    |
       | cus_s                                   |   lse_s: lease      |       cus_s, grp_s |
       +---------------------------------------->|   les_s: lessee     |<-------------------+
                                                 |   cus_s: customer   |
                                                 |   grp_s: group      |
                                                 -----------------------

Information note:  All leases in a group belong to the same lessee.

Warning note: A join with the rls table on rls.cus_s or rls.cus_s/rls.grp_s is non-indexed and requires a search of the entire rls table.