Oracle level query

Generate N Number of records

SELECT ROWNUM NO FROM DUAL CONNECT BY LEVEL <= 10

Few usages of Level Query

/* This is a simple query which can generate a sequence of numbers. The following example generates a sequence of numbers from 1..100 */

SELECT LEVEL FROM dual CONNECT BY LEVEL <= 100;

/*The above query is useful in various scenarios like generating a sequence of dates from a given date. The following query generates 10 consecutive dates */

SELECT TO_DATE('01-01-2017','mm-dd-yyyy')+level-1 AS dates FROM dual CONNECT BY LEVEL <= 10;

01-JAN-17
02-JAN-17
03-JAN-17
04-JAN-17
05-JAN-17
06-JAN-17
07-JAN-17
08-JAN-17
09-JAN-17
10-JAN-17

Conclusion

In this page (written and validated by A. Gawali) you learned about Oracle level query . What's Next? If you are interested in completing Oracle tutorial, your next topic will be learning about: Oracle Hierarchical Retrieval With Oracle Database 12C.

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