Question

Simple Question About INSERT INTO Using Select Query - Oracle

Asked by: F-J-K

INSERT INTO CustomerFamilyHistory (customerfamilyhistory_id_seq.nextval, firstname, lastname, age, ?????, sibling,  customerid)
SELECT customerfamilymemberfirstname, customerfamilymemberlastname,
customerfamilymemberage, customerfamilymembersibling, cusfamilymembcustomerID
FROM CustomerFamilyMember;

Insert values into the history record from CustomerFamilyMember. However, CustomerFamilyHistory have a primary key customerfamilyhistoryid which uses sequence. Is the above INSERT INTO structured correctly? What about leavingDate, how can i handle the situation of inserting every CustomerFamilyMember column to the right place in History table?

P.S. discard the naming convention...

Assume i have the following empty table:
 
CREATE TABLE CustomerFamilyHistory
(
	customerfamilyhistoryid number(10) CONSTRAINT customerfamilyhistoryid_pk PRIMARY KEY,
	firstname varchar2(50) NOT NULL,
	lastname varchar2(50) NOT NULL,
	age number(3) NOT NULL,
        leavingDate date DEFAULT SYSDATE NOT NULL,
	sibling varchar2(20) NOT NULL,
	customerid number(7) NOT NULL,
);
                                  
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Asked On
2009-09-17 at 20:36:43ID24742216
Tags

sql

,

rdbms

,

normalization

,

database design

,

ddl script

,

sql script

,

sql query

,

oracle

Topics

Oracle 11.x Database

,

Oracle 10.x

,

Oracle CRM

Participating Experts
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Comments
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Answers

 

by: ravindran_eeePosted on 2009-09-17 at 20:52:53ID: 25362846

You need INSERT with SELECT subquery

http://www.adp-gmbh.ch/ora/sql/insert/select_and_subquery.html

You overall query would be like,

INSERT INTO CustomerFamilyHistory (customerfamilyhistoryID, firstname, lastname, age, leavingDate, sibling,  customerid)
(SELECT customerfamilyhistory_id_seq.nextval, customerfamilymemberfirstname, customerfamilymemberlastname, customerfamilymemberage, NULL, customerfamilymembersibling, cusfamilymembcustomerID
FROM CustomerFamilyMember)

You can select the next value in sequence from the select statement. The date field can be left NULL since default is sysdate.

Try this and let me know if there are any issues

 

by: F-J-KPosted on 2009-09-17 at 21:09:52ID: 25362886

Since i don't have any records yet. I got "0 rows created" which the query is structured correctly. Right? Just want to confirm.

NULL and customerfamilyhistory_id_seq.nextval are not part of the CustomerFamilyMember, so columns on SELECT are more than the actual number of columns in CustomerFamilyMember. Shouldn't this produce an error?

 

by: F-J-KPosted on 2009-09-17 at 21:40:38ID: 31630387

Worked....Thanks

 

by: ravindran_eeePosted on 2009-09-17 at 22:46:39ID: 25363146

Since you accepted the answer, I assume you already aware of the answers for your questions. However, for reference am answering your questions.

Yes, no error means the query is structured correctly! But you need some data to make sure you getting the desired result. Its a simple query and I don't think there will be any issues

There is no restriction on the number of columns being selected from a table. It will not produce any error

 

by: F-J-KPosted on 2009-09-17 at 22:57:24ID: 25363189

"There is no restriction on the number of columns being selected from a table. It will not produce any error"

If Customer table has firstname and lastname columns only and i did

select firstname, lastname, test_column
from Customer;

I would get an error because test_column not part of Customer. Can you please clarify since i see contradictions in here.

 

by: F-J-KPosted on 2009-09-18 at 01:02:29ID: 25363638

Based on your last response:

select firstname, lastname, test_column
from Customer;

The above query shouldn't throw any error. test_column is not part of Customer. Therefore, i got an error.

 

by: ravindran_eeePosted on 2009-09-18 at 05:06:15ID: 25364978

When u are writing a select statement, the columns being selected should be present in the table. In addition to that you can select nextval of sequences, call functions, hard-coded value, etc..

Below are some sample scenarios,

select firstname, lastname, 'Hardcoded column'
from Customer;
In above query the text 'Hardcoded column' will appear for each row

select firstname, lastname, function_mergename(firstname,lastname)
from Customer;
Here function_mergename could be a function which returns the merged value

This is what I meant. Hope this makes sense now!

 

by: F-J-KPosted on 2009-09-18 at 05:36:22ID: 25365232

Yes, got it.

20120131-EE-VQP-002

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