I am using SQL server 2008, and I have created one Database called DemoDb as you can see in below image. I am migrating this existing database to MongoDb now. But I am not aware about Schemas in mongodb. In below image in red square you can see the schemas like admin, login, User etc.
My Question is how I can migrate or create this kind of schema in mongodb. ?
can you please suggest me or help me.
Any help or suggestions will be highly appreciated ...
Thanks
Did you read the MongoDB manual at least?
There is a chapter SQL to MongoDB Mapping Chart which have a useful information for you.
SQL Terms/Concepts - MongoDB Terms/Concepts
table - collection
row - document or BSON document
column - field
table joins - $lookup, embedded documents
...
There is no other way as you must familiarize yourself with MongoDB basics at least.
P.S. MongoDB University have a free courses.
Related
Background: We are working on a migration project wherein we have to migrate data from Azure Cosmos DB To Azure SQL Database. on analyzing the Cosmos DB we found there are different structures of documents.
Requirement: We have been looking over the internet to get a query using which we can know as to how many unique/different document structures are there. however, we have not been able to find one. Any links pointers will be appreciated. Kindly let know if any further details required.
As #Mark Brown said, we can use Hackolade to analyze our structure.
Hackolade was specially adapted to support the data modeling of multiple object types within one single collection - while supporting multiple collections as well - in order to support the pricing model of Cosmos DB.
How can i replicate (incremental load) MongoDB (NoSQL) to SQL tables.
We have a web-based solution that loading data into MongoDB. The data size is almost 1TB. We need to do BI Reporting in the Looker BI tool. but looker doesn't support MongoDB directly. So we have to replicate our data into SQL form we have redshift for the target database.
Main requirements for parsing NoSQL to SQL:
Parent Node should be the main table
Nested node/arrays should be a separate table with parent key (foreign key)
Whenever a new column is introduced in MongoDB source it should automatically start replicating that new field from any document to the target database.
Incremental refresh from source to target.
I've seen Stitch Data ETL which fits my requirement but I'm looking for OpenSource any ETL/DB tool or library.
Please help.
Posting answers to help out others with the same requirements.
I'm not able to get any open source ETL tool who can full fill the above 4 requirements.
Trying to writing python code to do so. But a paid tool named Precog helped me to fulfill all the above requirements, and a little bit cheaper than Stitch Data ETL.
Thanks
I'm new to MongoDB. before I start MongoDB i was working with SQL databases. I know that MongoDB is different from SQL and in Mongodb you don't have to define a schema. but if you give your database to other teammates and ask him to work with your database, how he can figure out how to work with a Collection? in this situation in SQL, your teammate will open the database and look at the Table and he will understand how to work with it. Suppose according to your analyze, the User Collection should hold the following data model:
But when you have not defined it anywhere, How can you explain it to others?
I hope that I have been able to express my meaning correctly.
Good morning all,
How to create employees table in the marklogic by using sql or javascript?
Thanks in advance,
Naveen
You do not create tables in MarkLogic. You insert individual structured documents (XML/JSON) where each document is as close as you would get to the idea of a table row in a relational database.
For use of SQL to query these documents, MarkLogic allows you to create views. These are similiar to views in SQL and expose specific elements/attributes/properties of your documents.
I think you need to read the section on SQL in MarkLogic as a starting point and then come back with more specific questions if you get stuck. https://docs.marklogic.com/guide/sql/intro
MarkLogic is schema agnostic, you can achieve a structure thru a Schema database to enforce document structure. Just create your XSD file and your document can be validated against that.
Check this link for more information:
https://developer.marklogic.com/learn/2007-04-schema
Since MarkLogic is schema-agnostic database, you can restrict the element/attribute or define the XML structure through XSD.
However if you want to create tables using SQL, you actually have to create views.
Please check more on https://docs.marklogic.com/guide/sql/intro.
N.B : If you are creating views, make sure range-index is created for all the elements or attributes that you wish to use.
I am looking at a way to establish a few tables in my database.
I want to connect every user that logs in to the comments that they leave. There should be 2 or 3 tables. But I have no understanding on how to achieve this. Does anyone know where I can read and learn about how to build table relationships effectively?
You should understand how 'joins' work. They will define how you access your data later.
Check out this site:
http://www.sql-tutorial.net/SQL-JOIN.asp
Even if you don't have MS Access, this is a good tutorial for getting a handle on creating tables and defining relationships.
http://office.microsoft.com/en-us/training/design-tables-for-a-new-access-2007-database-RZ010286445.aspx
Also, "SQL for Dummies" is a great reference to have. Get a used copy on Amazon.
Here's a walk-through for SQL Server 2005: http://dotnetguts.blogspot.com/2007/10/basics-of-sql-server-2005.html