Insert using IF/ELSE statements - sql

Question

I am sorry if my question is not clear or my query is not sufficient to help. I have a procedure that has multiple if/else statement. My goal is to insert one row if that if statements meets the criteria else go further. Something like this:
create or replace procedure abc.xyz
( i_name varchar2
,number number,
sections varchar2)
...
max_date date;
min_date date;
...
if(sum=0)
insert into abc_table
(id,name,number,sections,description,date,amount,price,source,latest_date)
select user_seq.nextval,name,number,max_date,amount,0
,'xyz',trunc(sysdate))
from abc_table x
where x.name=i_name
and x.number=i_name
and x.section=i_section;
elseif (sum>0)
insert into abc_table
(id,name,number,sections,description,date,amount,price,source,latest_date)
select user_seq.nextval,name,number,max_date,amount,0
,'xyz',trunc(sysdate))
from abc_table x
where x.name=i_name
and x.number=i_name;
and x.section=i_section;
when i run my procedure, to insert the calculated value , the values are correct but so many rows were inserted. How can I prevent from multiple insert and make only one row insert ?

Answer 1

You are doing it wrong.
According to the Oracle documentation, The syntax for the Oracle INSERT statement when inserting a single record using the VALUES keyword is:
INSERT INTO table
(column1, column2, ... column_n )
VALUES
(expression1, expression2, ... expression_n );
But the syntax for the Oracle INSERT statement when inserting multiple records using a SELECT statement is:
INSERT INTO table
(column1, column2, ... column_n )
SELECT expression1, expression2, ... expression_n
FROM source_table
[WHERE conditions];
reference: https://www.techonthenet.com/oracle/insert.php
from the link i shared:
If you don't want to insert duplicate:
INSERT INTO clients
(client_id, client_name, client_type)
SELECT 10345, 'IBM', 'advertising'
FROM dual
WHERE NOT EXISTS (SELECT *
FROM clients
WHERE clients.client_id = 10345);