Oracle - Conditional Insert with Sequence

Question

I know the sequence can not be used in these places.

For a SELECT statement:

In a WHERE clause
In a GROUP BY or ORDER BY clause
In a DISTINCT clause
Along with a UNION or INTERSECT or MINUS

In a sub-query

Please help to achieve the below requirement with conditional insert. Objective is - Need to insert if the name is not exist in the table as its protected by Sequence as primary key.

INSERT 
WHEN EXISTS (SELECT 0 FROM TABLE1 WHERE NAME = 'DUPLICATE_NAME_TEST') 
THEN
INTO TABLE1 (KEY, NAME, GROUP) 
SELECT TESTSEQ.NEXTVAL, 'DUPLICATE_NAME_TEST', 30 FROM DUAL;

Gordon Linoff · Accepted Answer · 2021-03-02 17:44:40Z

1

SQL has no INSERT WHEN construct. It does have WHERE. So you intend something like this:

INSERT INTO TABLE1 (NAME, GROUP)
    SELECT 'DUPLICATE_NAME_TEST', 30
    FROM DUAL
    WHERE NOT EXISTS (SELECT 1 FROM TABLE1 T1 WHERE T1.NAME = 'DUPLICATE_NAME_TEST');

answered Mar 2, 2021 at 17:44

Gordon Linoff

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