Problem with creating a sequence
HelloI'm having a problem with a sequence that I am creating. Basically, I'm trying to create a sequence with a default value based on the value in another table, i.e.
CREATE SEQUENCE seq
START WITH (
min(customer_id) from customer
)
INCREMENT BY 1;
Is this possible? I get errors.
You can use dynamic sql or, if you use SQL * more take advantage of substitution variables:
SQL> DROP SEQUENCE seq
2 /
DROP SEQUENCE seq
*
ERROR at line 1:
ORA-02289: sequence does not exist
SQL> DECLARE
2 stmt VARCHAR2(1000);
3 BEGIN
4 SELECT 'CREATE SEQUENCE seq START WITH ' || min(empno)
5 INTO stmt
6 FROM emp;
7 EXECUTE IMMEDIATE stmt;
8 END;
9 /
PL/SQL procedure successfully completed.
SQL> SELECT seq.NEXTVAL FROM dual
2 /
NEXTVAL
----------
7369
SQL> DROP SEQUENCE seq
2 /
Sequence dropped.
SQL> COLUMN s NEW_VALUE s NOPRINT
SQL> SELECT min(empno) s
2 FROM emp
3 /
SQL> CREATE SEQUENCE seq START WITH &s;
old 1: CREATE SEQUENCE seq START WITH &s
new 1: CREATE SEQUENCE seq START WITH 7369
Sequence created.
SQL> SELECT seq.NEXTVAL FROM dual
2 /
NEXTVAL
----------
7369
SQL>
SY.
Tags: Database
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