[postgis-users] questions about geometry_columns base table!

[zhangmb]

Hello,I have some questions about SQL/MM part 3:spatial.
1. In the definition of st_geometry_columns base table, what is the meaning of the TABLE_CATALOG and what it should store exactly? what is the meaning of the unqualified schema name and the qualified identifier?
2. In the definition of st_spatial_reference_systems base table, why using SRS_NAME as primary key as opposed to using SRS_SRID?

Thanks a lot!

--zhangmb
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