Major enhancements in PostgreSQL 9.3 include:
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Add materialized views
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Make simple views auto-updatable
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Add many features for the JSON data type, including operators and functions to extract elements from JSON values
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Implement SQL-standard __EXPRESSION__s.html#QUERIES-LATERAL" style="color: rgb(0, 78, 102)" target="_blank">LATERAL option for FROM-clause subqueries and function calls
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Allow foreign data wrappers to support writes (inserts/updates/deletes) on foreign tables
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Add a Postgres foreign data wrapper to allow access to other Postgres servers
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Add support for event triggers
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Add optional ability to checksum data pages and report corruption
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Prevent non-key-field row updates from blocking foreign key checks
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Greatly reduce System V shared memory requirements
