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Should these Mysql foreign keys also have index assigned


Should these Mysql foreign keys also have index assigned

By : user2955705
Date : November 22 2020, 10:40 AM
will help you Yes. This is the right way. Also if you want to use referential integrity you should make these fields as index keys that is cat_id and seller_id in Product table.
code :


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PRIMARY and INDEX keys for one FOREIGN column in MySQL

PRIMARY and INDEX keys for one FOREIGN column in MySQL


By : user1698896
Date : March 29 2020, 07:55 AM
To fix the issue you can do I solved that problem now. It seems that the default database storage engine was set to MyISAM on my server, so because I didn't specify it explicitely, all foreign key relations just discarded (without saying so though). After converting it to InnoDB I no longer get the warning, so it seems that everything is working as it should.
However in this special case, I'll stick to MyISAM, and leave the foreign key relations outside for now, because I want to auto increment the second attribute in that multi-key (and that is not supported by InnoDB), and that's a bit more useful for this application than having foreign keys (especially when having data where updating and deleting will be done very rarely).
How to use foreign keys and a spatial index inside a MySQL table?

How to use foreign keys and a spatial index inside a MySQL table?


By : Parvez boss
Date : March 29 2020, 07:55 AM
wish of those help
How can we combine fast children search in tree and also have a SPATIAL INDEX in a table?
code :
CREATE INDEX ix_mytable_parentid ON mytable (parentid)
SELECT  *
FROM    mytable m1
JOIN    mytable m2
ON      MBRContains (m2.area, m1.area)
        AND m2.parentId = m1.id
WHERE   m1.name = 'London'
Using MySQL Index for foreign Keys with Hibernate

Using MySQL Index for foreign Keys with Hibernate


By : สุนีย์ พรหมเทศ
Date : March 29 2020, 07:55 AM
will help you Yes, the query optimizer decides to use or not to use an index. Use EXPLAIN on your SELECT statements to see what it uses. There is no difference in a query created by Hibernate or a hardcoded query.
Foreign keys must be Index in mySQL?

Foreign keys must be Index in mySQL?


By : kodmarcel
Date : March 29 2020, 07:55 AM
should help you out I've just created my first mySQL table on my own (other than using Joomla, Wordpress, etc.) and I am MS SQL developer for years but normally I can easily create a foreign key in MS SQL but I came across a difficulty or lack of knowledge here. , Short answer: Yes, MySQL forces you to index foreign key.
Consequences of removing index used for foreign keys in MySQL

Consequences of removing index used for foreign keys in MySQL


By : annie-reefmonkies
Date : March 29 2020, 07:55 AM
I wish this helpful for you This appears to be bug #16896810. Apparently this was fixed for 5.7.2 (2013-09-21, Milestone 12)--after 5.7.9 (2015-10-21, General Availability). It was also fixed in MySQL 5.6.14 (2013-09-20, General Availability)
InnoDB: When dropping all indexes on a column with multiple indexes, InnoDB failed to block a DROP INDEX operation when a foreign key constraint requires an index. (Bug #16896810)
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