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INFORMATION_SCHEMA Support in MySQL, PostgreSQL
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I've known about the INFORMATION_SCHEMA views (or system tables) in SQL Server for a while, but I just leared recently that they are actually part of the SQL-92 standard and supported on other database platforms.

The INFORMATION_SCHEMA views provide meta data information about the tables, columns, and other parts of your database. Because the structure of these tables are standardized you can write SQL statements that work on various database platforms.

For example suppose you want to return a resultset with a list of all columns in a table called employees

SELECT table_name, column_name, is_nullable, data_type, …
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