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Table Of Contents
Mastering phpMyAdmin 3.3.x for Effective MySQL Management
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In the SQL:2003 standard, access to the data dictionary (or database metadata) is provided by a structure called information_schema. As this is part of the standard, and already exists in other database systems, the decision to implement this feature into MySQL was a very good one.
MySQL has added some information that is not part of the standard for example, INFORMATION_SCHEMA.COLUMNS.COLUMN_TYPE. Be aware of the fact that if you plan to use this information in a software project, it has to remain portable to other SQL implementations.
A phpMyAdmin user sees the information_schema as a normal database containing views that describe many aspects of the structure of the databases hosted on the server. Here is a subset of what can be seen (and in fact, the only possible operation on this database is SELECT).
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Internally, phpMyAdmin calls the information_schema for some of its operations, instead of the corresponding SHOW statements, in order to retrieve metadata....
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