From: | Richard Smith <ozric(at)tampabay(dot)rr(dot)com> |
---|---|
To: | pgsql-general(at)postgresql(dot)org(dot)pgsql-questions(at)postgreSQL(dot)org |
Subject: | beginner Table data type question |
Date: | 2000-05-19 15:34:21 |
Message-ID: | 39255FA9.B847357B@tampabay.rr.com |
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Thread: | |
Lists: | pgsql-general |
Hi, I just start using pgsql and I am new to SQL also. I have read lots
of
documents on this and I cant seem to find the answer, perhaps you can
help me.
Say I have a table:
pgsql=> \d test_table
test_table
------------------------------
f1| CHAR (40)
f2| CHAR (40)
Somewhere down the line I need to change the data type on f2 to CHAR
(50) and add constrains like UNIQUE. What is the best was to change
tables in this way?
Can I just make a new table the way I want and COPY the data out of the
old table and COPY it back in? do I use CAST ? Is there some ALTER
TABLE tablename MODIFY command I can use?
This question has been bugging me for awhile. Because I am new to SQL I
find that I make bad design choices about data types and such all the
time. So I need to know the best way to change them.
Richard
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