SQL Server表关联更新技巧

在SQL Server中，若需按排序结果更新某字段，可借助表关联方式实现。通过将排序后的结果与原表关联，即可完成字段更新操作，下面介绍具体实现方法。

select语句中if的使用技巧

许多人在写SQL时都想用if，下面教你正确使用方法。 1、 先准备好待处理的数据，见下图所示。 2、 许多人使用时习惯在select语句中直接嵌入if条件，所示。 3、 在SELECT语句中，通常使用CASE来实现IF的功能，具体用法所示。 4、 随后即可得出if语句的执行结果，具体所示。 5、 使用时别忘了在末尾加上end，所示。 6、 最后的Else可省略，直接删除即可，所示。 8、 许多人习 ...
InfoWorld

Beyond SQL: 8 new languages for data querying

SQL has dominated data querying for decades. Newer query languages offer more elegance, simplicity, and flexibility for modern use cases. For the last three decades, databases and Structured Query ...
dbta

After 50 Years, What’s Next for SQL?

Even after 50 years, Structured Query Language, or SQL, remains the native tongue for those who speak data. It’s had impressive staying power since it was first coined the Structured Query English ...
Ars Technica

[SQL] Handle SELECT INTO #TempTable In IF/ELSE Statement

Well, if you happen to be using Sql Server you can do that sort of thing in T-Sql. In Oracle, you can also accomplish the same thing using pl/sql. Either way i'd do it in a stored ...
dbta

Relational Closure Can Turn Any SQL Select Into a Mosaic

Inside a relational database management system, the princi­pal persisted data structure is considered a logical relation. Operations performed against that data within the RDBMS result in a logical ...