Oracle-L: Re: Pl/SQL-statement

From: Jonathan Gennick <jonathan_at_gennick.com>
Date: Mon, 10 Nov 2003 19:54:24 -0800
Message-ID: <F001.005D63E8.20031110195424@fatcity.com>

Hello Roland,

Do you even need PL/SQL for what you want to do?

rsis> I want to check whether field1 in table1 exists in
rsis> table3. If so then I want an insert statement to be
rsis> run...insert into table3

If the field *is* in table 3, you want to insert it into table 3 again? I find that an odd requirement. However, you might try something like:

INSERT INTO table3

   SELECT field1
   FROM table1
   WHERE field1 IN (SELECT DISTINCT field1 FROM table3);

EXISTS might work better than IN. You might need to adjust your SELECT column list to match your target table. I don't know what other columns are in table3. If table3 is really large, I'd consider using EXISTS and getting rid of DISTINCT. Well, you might need to try a few variations to figure out which performs the best.

Best regards,

Jonathan Gennick --- Brighten the corner where you are http://Gennick.com * 906.387.1698 * mailto:jonathan@gennick.com

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Monday, November 10, 2003, 9:54:25 AM, roland.skoldblom_at_ica.se (roland.skoldblom_at_ica.se) wrote: rsis> Hallo,

rsis> I would like to do the following with an sql( pl/sql) statement.

rsis> I have table1 and table2 andtable3.

rsis> I want to check whether field1 in table1 exists in table3. If so then I want an insert statement to be run...insert into table3..... rsis> If it doesnt find that value then th escript will go to table2 and check if the vaules exists in that table, if it finds it then I want another insert statement to be run.

rsis> Please help me with an easy example, i dont know if this is so simply but I cantget it right though.

rsis> Thanks

rsis> Roland

rsis> --
rsis> Please see the official ORACLE-L FAQ: http://www.orafaq.net

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Please see the official ORACLE-L FAQ: http://www.orafaq.net
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Author: Jonathan Gennick
INET: jonathan_at_gennick.com

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