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Answered Aug 22, 2021 · 1.1K Views Read answer →
To use mongoose aggregate example you can do with $match if you need this AgencyTranslation: /^BROADCASTING/ condition Contacts.aggregate([ { $match : { AgencyTranslation: /^BROADCASTING/ } }, { $group: { "_id": { code: "$Code", name: "$Name" } } } ], function(err, contacts) { // ... });
Answered Jul 15, 2021 · 1.2K Views Read answer →
Normalization is a method of organising the database table to reduce redundancy and improve its data integrity. Divides the larger unorganised table into smaller tables which are linked through relationships Helps in creating a overall simple Database design. A normalized table promotes better security model
Answered Nov 17, 2019 · 1.4K Views Read answer →
A key is a value that is used to identify a record uniquely in a table . Keys can be defined on single or multiple columns depending on the requirement. Columns that are used to define a key is known as key column Similarly, columns that are not used to define a key are called non-key columns.
Answered Nov 10, 2019 · 1.3K Views Read answer →
Primary Key - A primary key is used to identify each record uniquely by enforcing Unique, NOT NULL constraint on the column. Foreign Key - A foreign key is used to refer to the primary key of another table for its related data in order to help connect the tables by reference.
Answered Nov 5, 2019 · 1.4K Views Read answer →
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