Database Schema Explained: Definitions and Importance

In SQL Server, a schema is a namespace within a database. The default schema is dbo ... in the HR schema. In PostgreSQL, a database can contain multiple schemas (namespaces). By default, there’s a schema called “public,” but you can create additional schemas to organize objects and manage access. You reference an object by schema ...

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sql server - What is this symbol in an SQL query ... - Stack Overflow

Here is a list of the operators used in SQL Server. It comes from meaning < less than or > greater than. i.e. anything but equal. Share. Improve this answer. Follow edited Nov 8, 2010 at 12:48. answered Nov 8, 2010 at 12:38. mikej mikej. 66.4k 18 18 ...

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New Objects in SQL Server 2025 - And Thousands of New Undocumented ...

The first public preview of SQL Server 2025 dropped yesterday, and here’s what’s new under the hood as compared to today’s SQL Server 2022 CU19. Forgive me – this is quite a lengthy post, and it’s mostly a data dump. There are new stored procedures, extended stored procs, views, feature switches, new columns in existing...

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Temporal Tables - SQL Server | Microsoft Learn

Applies to: SQL Server 2016 (13.x) and later versions Azure SQL Database Azure SQL Managed Instance SQL database in Microsoft Fabric Temporal tables (also known as system-versioned temporal tables), are a database feature that brings built-in support for providing information about data stored in the table at any point in time, rather than only the data that is correct at the current moment in ...

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Hierarchical Data (SQL Server) - SQL Server | Microsoft Learn

Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance SQL database in Microsoft Fabric The built-in hierarchyid data type makes it easier to store and query hierarchical data.hierarchyid is optimized for representing trees, which are the most common type of hierarchical data.. Hierarchical data is defined as a set of data items that are related to each other by hierarchical ...

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What Is SQL Server? - SQL Server | Microsoft Learn

Documentation for SQL Server 2014 (12.x) and previous versions is available at Previous versions of SQL Server documentation. To find out which versions of SQL Server are currently supported, see SQL Server end of support options. The underlying SQL Server Database Engine is also used by the following products and services: Azure SQL Database

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What is NewSQL? Bridging SQL and NoSQL - TecAdmin

A traditional SQL database, like MySQL or PostgreSQL, is great because it’s super organized and reliable. It uses structured tables and something called ACID transactions to make sure everything stays consistent—like ensuring a customer’s order and payment both go through or neither does.

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What is Sharding in DBMS? – TheLinuxCode

Sharding is a database architecture pattern where a single database is horizontally partitioned into multiple smaller, independent databases. Each of these smaller databases – called shards – contains a subset of the total data and runs on a separate server instance. The term "shard" originates from the word fragment or small piece.

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JSON data type (preview) - SQL Server | Microsoft Learn

The native json type supports the modify method. Use modify to modify JSON documents stored in a column. The modify method has optimizations to perform in-place modifications to the data where possible, and is the preferred way to modify a JSON document in a json type column.. For JSON strings, if the new value is less than or equal to the existing value, then in-place modification is possible.

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Overview - SQL Server Master Data Services | Microsoft Learn

We continue to support MDS in SQL Server 2022 (16.x) and earlier versions. This topic describes the key data organization and management features of Master Data Services. Master Data Services enables you to manage a master set of your organization's data. You can organize the data into models, create rules for updating the data, and control who ...

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