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Querying the schema for column widths - what syntax do I use?

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I am working on some upgrades to the MyDNS open source product. I have some expertise in MySQL but am not overly familiar with PostgreSQL and need some guidance on how to query the schema for the maximum size of data a column can hold.

In MySQL I can do either: a "DESCRIBE" command or do "SELECT COLUMNS" command. And then parse the result for the length in the type column of the row returned. How would I do a similar function using PostgreSQL - I have tried to find this in the manuals and in this mailing list but not found any pointers to get me started.

Apologies for asking such a simple question but I am being a bit lazy as I want to get on with releasing the MyDNS code.

Regards, Howard.


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