If you've just started writing SQL Server queries, there's a good chance you probably wrote a query, saw it return the right rows, and moved on. That's normal and it's also exactly why so many ...

本内容遵循CC 4.0 BY-SA版权协议 一次线上性能事故让我印象非常深。明明是一条主键查询，主键字段上还建着索引，但查询就是不走索引，执行计划硬生生给了一个全表扫描。排查到最后，竟然栽 ...

Character data types that are either fixed-size, nchar, or variable-size, nvarchar. In SQL Server 2012 (11.x) and later versions, when a Supplementary Character (SC) enabled collation is used, these ...

本内容遵循CC 4.0 BY-SA版权协议 NVARCHAR(MAX) 是 SQL Server 中用于存储超大 Unicode 文本的数据类型，最大容量是 2^31-1 个字节（约 2GB），换算成字符数取决于所用编码，在常见的 UTF-16 编码下大约是 10 ...

SQL data types enforce data integrity by validating values at insert time, preventing data corruption across analytics, BI, and ML workloads. Choosing appropriately sized data types improves query ...

Si tu aplicación .NET usa Dapper para consultar SQL Server y tus columnas son de tipo varchar, hay una trampa de rendimiento que probablemente está ejecutándose en producción ahora mismo — sin ningún ...

x:mssql xf:sql editorSQL Editor and Editor Services like autocompletion, highlighting, folding, formatting, etc.SQL Editor and Editor Services like autocompletion, highlighting, folding, formatting, ...

After writing a considerable number of SQL scripts, you’re likely to reach a performance plateau. You extract insights using the same strategies and run into the same types of errors. Fortunately, you ...

Back in the earlier part of the year (February maybe?), I put this tutorial together for our early adopters in the SQL Server 2025 program. It’s a guide for setting up SQL Server 2025 in a Hyper-V VM ...

In this article we’ll cover the essential SQL Server data types and discuss their common usage. Data is at the core of all relational database systems and SQL Server supports many different types of ...

Character data types that are either fixed-size, **nchar**, or variable-size, **nvarchar**. In [!INCLUDE [ssSQL11](../../includes/sssql11-md.md)] and later versions ...