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Alternative of Foreign Key in RDBMS


By : natalia ferreira
Date : September 21 2020, 04:00 PM
I wish did fix the issue. You don't have to define foreign keys in a MySQL database. In a query, you can use joins to define how relations should be fed into your query's result set.
There are good reasons to define foreign keys, though. Some of these are:
code :


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RDBMS, foreign key merged or separate table?


By : user3551749
Date : March 29 2020, 07:55 AM
Hope that helps I don't think it will be a good idea to keep a separate table as you suggested as order_number is directly related to order.
If you are still planning to keep a different table, take 'add_date' along with number. I'm finding 'add_date' more uglier than order number.

mysql RDBMS, applying foreign key constraints in many tables


By : Sakay301
Date : March 29 2020, 07:55 AM
Hope this helps Ok, I'll try to help. :-) First make sure you know the syntax completely by using the MySQL Manual for creating tables.
MySQL 5.1: CREATE TABLE
code :
REFERENCES tbl_name (index_col_name,...)
  [MATCH FULL | MATCH PARTIAL | MATCH SIMPLE]
  [ON DELETE reference_option]    <----
  [ON UPDATE reference_option]    <----

reference_option:
    RESTRICT | CASCADE | SET NULL | NO ACTION
CREATE TABLE IF NOT EXISTS contactStats_tbl(
id INT UNSIGNED NOT NULL AUTO_INCREMENT COMMENT 'Contact ID number.',
email VARCHAR(254) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL COMMENT 'E-mail address from contacts_tbl.',
subscribeTime TIMESTAMP DEFAULT '0000-00-00 00:00:00' COMMENT 'Time of subscription.',
unsubscribeTime TIMESTAMP DEFAULT '0000-00-00 00:00:00' COMMENT 'Time of unsubscription.',
totalMessages INT(4) NOT NULL COMMENT 'Number of messages sent.',
newsLetter ENUM('Y', 'N') CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL DEFAULT 'N' COMMENT 'Newsletter subscription.',
CONSTRAINT csconstr01 FOREIGN KEY (id, email) REFERENCES contacts_db.contacts_tbl(id, email) ON UPDATE CASCADE ON DELETE RESTRICT)
ENGINE=InnoDB DEFAULT CHARACTER SET = utf8 COMMENT 'Contact statistics table.';

Scalable RDBMS alternative, NoSQL, NewSQL


By : Rohit
Date : March 29 2020, 07:55 AM
may help you . TiDB
Compatibility with MySQL

Ideas on this alternative to ORM + RDBMS?


By : shahryar320
Date : March 29 2020, 07:55 AM
this will help Definitely give Terracotta a try. It's free (unless you go Enterprise which has an SLA and support). It is a JVM-level cluster, so to speak, so you don't have the issues associated with sessions on multiple boxes behind disparate JK workers (assuming you're using this for a J2EE app).
I'm just rambling, so have a look here: http://en.wikipedia.org/wiki/Terracotta_Cluster

Alternative to NULL in RDBMs


By : Riverstream Share
Date : March 29 2020, 07:55 AM
I hope this helps you . You should probably compromise and settle on NULL. It is handled throughout the database system, in comparisons and so on.
You can add the reason in another column. For your example with names, I might be inclined to have multiple columns (including optional ones such as nickname and honorific), along perhaps with a name "format".
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