How can i join more than 20 tables which contains more than 5 lacks records
how can i join more than 20 tables which contains more than 5 lacks records
If you're trying to join 20 tables I would check:
- Are all the joins necessary. It's easy sometimes to just join to another table because you're unsure as to whether it's required.
- What sort of application is it? 20 joins seems a lot to me. Are you trying to achieve too much with one query? Is it possible to break the problem down?
- If it is necessary to join so many tables then force the use of hash joins in the query, especially if you're processing a lot of data and want the best throughput. If you want a quicker response, this will not be a appropriate.
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